Engine, General

2010 BMW Z4 30i
ENGINE Engine - Repair - Z4
ENGINE
Engine - Repair - Z4
ENGINE, GENERAL
11 00 039 CHECKING COMPRESSION IN ALL CYLINDERS (N43/N53/N54)
Read out fault memory of DME control unit

Check stored faults
Rectify faults
Delete fault memory
IMPORTANT: High tension - mortal danger!
Interrupt power supply to ignition coils.
Read and comply with notes on compression pressure check.
Necessary preliminary tasks
Remove spark plugs
Unscrew tip (1) from special tool 11 0 222.
IMPORTANT: Then check the Schrader valve that is now visible for secure seating.
Fig. 1: Removing Tip From Special Tool 11 0 222

Courtesy of BMW OF NORTH AMERICA, INC.
Prepare special tool 11 0 222 in conjunction with 11 8 732 and 11 8 731.
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10:22:18 a. m. Page 1 © 2011 Mitchell Repair Information Company, LLC.
2010 BMW Z4 30i
Fig. 2: Identifying Special Tool 11 0 222, 11 8 732 And 11 8 731

Screw special tool 11 0 222 into special tool 11 8 731 to 10 Nm.
IMPORTANT: Oil thread on special tool 11 8 731.
Fig. 3: Inserting Special Tool 11 0 222 Into Special Tool 11 8 731

Screw special tool 11 0 222 by hand into spark plug thread and connect special tool 11 0 224.
Use adapter (1) if the compression pressure is being checked with the BMW diagnosis system.
Depress accelerator pedal and actuate starter until compression pressure stops rising.
NOMINAL VALUES , compression pressure
domingo, 3 de octubre de 2021 10:22:18 a. m. Page 2 © 2011 Mitchell Repair Information Company, LLC.
2010 BMW Z4 30i
Fig. 4: Installing Special Tool 11 0 222 Into Spark Plug Thread

Assemble engine
Delete fault memory.
00 DANGER OF POISONING IF OIL IS INGESTED/ABSORBED THROUGH THE SKIN
Danger of poisoning!
Ingesting oil or absorbing through the skin may cause poisoning!
Possible symptoms are:
Headaches
Dizziness
Stomach aches
Vomiting
Diarrhoea
Cramps/fits
Unconsciousness
Protective measures/rules of conduct
Pour oil only into appropriately marked containers

Do not pour oil into drinking vessels (drinks bottles, glasses, cups or mugs)
Observe country-specific safety regulations
2010 BMW Z4 30i
First aid measures
Do not induce vomiting.
If the person affected is still conscious, he/she must rinse out their mouth with water, drink plenty of
water and consult a doctor immediately.
If the person affected is unconscious, do not administer anything by mouth, place the person in the
recovery position and seek immediate medical attention.
ENGINE IDENTIFICATION
Punch engine numbers at marked surface with number punch.
Magnesium crankcase with sticker
M47/M47TU/M47T2
Fig. 5: Identifying Engine Identification Numbers Location (M47/M47TU/M47T2)

M57/M57TU/M57T2
2010 BMW Z4 30i
Fig. 6: Identifying Engine Identification Numbers Location - M57/M57TU/M57T2

M67/M67TU
Fig. 7: Identifying Engine Identification Numbers Location - M67/M67TU

N47/N47S/N47C/N57 N57S
2010 BMW Z4 30i
Fig. 8: Identifying Engine Identification Numbers Location - N47/N47S/N47C/N57 N57S

M52/M52TU
Fig. 9: Identifying Engine Identification Numbers Location (M52 / M52TU)

M54
2010 BMW Z4 30i
Fig. 10: Identifying Engine Identification Numbers Location (M54)

M56
Fig. 11: Identifying Engine Identification Numbers Location - M56

N40/N45/N45T/N43
2010 BMW Z4 30i
Fig. 12: Identifying Engine Identification Numbers Location - N40/N45/N45T/N43

N42/N46/N46T
Fig. 13: Identifying Engine Identification Numbers Location - N42/N46/N46T

N51/N52/N52K/N52T/N53/N54/N55
2010 BMW Z4 30i
Fig. 14: Identifying Engine Identification Numbers Location - N51/N52/N52K/N52T/N53/N54/N55

N62/N62TU
Fig. 15: Identifying Engine Identification Numbers Location - N62/N62TU

N73
2010 BMW Z4 30i
Fig. 16: Identifying Engine Identification Numbers Location - N73

S54
Fig. 17: Identifying Engine Identification Numbers Location - S54

S85/S65
2010 BMW Z4 30i
Fig. 18: Identifying Engine Identification Numbers Location - S85/S65

W10/W11
Fig. 19: Identifying Engine Identification - W10/W11

N12/N14/N16/N18
2010 BMW Z4 30i
Fig. 20: Identifying Engine Identification Numbers Location - N12/N14/N16/N18

W17
Fig. 21: Identifying Engine Identification Numbers Location - W17

Assemble engine.
11 00... ENGINE OIL SERVICE (N54, N54T)
WARNING: Risk of scalding!
Carry out work on the vehicle only when wearing oil- and heat-resistant
protective gloves incl. forearm protection, face guard and protective
apron.
2010 BMW Z4 30i
IMPORTANT: Carry out the engine oil service only when the engine is at operating
temperature.
Observe the exact engine oil filling capacity.
Overfilling the engine with engine oil will result in engine damage.
Checking and drip-off times (at least 10 minutes) must be observed.
IMPORTANT: Risk of damage!
Protect belt drive against dirt.
Cover with suitable materials.
Recycling
Catch and dispose of drained engine oil in a suitable collecting vessel.
Observe country-specific waste disposal regulations.
Release oil filter cover with special tool 11 9 240 .
Tightening torque 11 42 1AZ .
NOTE: Engine oil flows out of the oil filter housing and back into the oil sump.
Picture shows E9x
Fig. 22: Removing Oil Filter Cover Using Special Tool 11 9 240
2010 BMW Z4 30i
NOTE: Presentation: without underbody protection.
Unclip service opening on underbody protection.
Remove screw plug (1) from oil sump and drain engine oil.
Installation note
Replace sealing ring.
Picture shows E9x
Fig. 23: Identifying Screw Plug On Oil Sump

Remove and insert oil filter element (1) in direction of arrow.
Installation note:
Replace oil filter element (1) and sealing rings (2).
NOTE: Coat sealing rings (2) with engine oil.
2010 BMW Z4 30i
Fig. 24: Removing And Inserting Oil Filter Element

Secure oil filter cover with special tool 11 9 240 .
NOTE: Pour in ENGINE OIL .
Start engine and run at idle until oil pressure indicator light goes out.
Switch off engine
Check oil filter cover and screw plug on oil sump for leaks.
Assemble engine.
2010 BMW Z4 30i
Fig. 25: Installing Oil Filter Cover Using Special Tool 11 9 240
Checking engine oil level:
Park vehicle on a horizontal surface

Allow engine to run at operating temperature for three minutes with increased engine speed (approx. 1100
RPM)
Read off engine oil level in instrument panel or on Control Display
Top up engine oil if necessary
11 00 590 EXCHANGE ENGINE (N54, N54T)
Necessary preliminary tasks:
Remove and install ENGINE .

Mount engine on ASSEMBLY STAND .
If necessary, remove foreign bodies from turbocharger group.
Check all assemblies and convert to replacement power plant.
Remove transportation locks (1).
NOTE: Catch escaping engine oil with a suitable cloth (2).
Fig. 26: Identifying Transportation Locks And Cloth

Transportation locks (1) are no longer needed.
2010 BMW Z4 30i
Fig. 27: Identifying Transportation Locks

Modify screw plugs (1) from old power plant.
Insert screw plugs (1).
Tightening torque: 11 42 11AZ.
Secure oil cooler lines with mounting bar (2).
Fig. 28: Identifying Screw Plugs And Mounting Bar

Assemble engine.
11 00 MOUNTING ENGINE ON ASSEMBLY STAND (N54, N54T)
IMPORTANT: Aluminum screws/bolts must be replaced each time they are released .
2010 BMW Z4 30i
Aluminum screws/bolts are permitted with and without
color coding (blue).
For reliable identification:
Aluminum screws/bolts are not magnetic.
Jointing torque and angle of rotation must be observed without fail (risk of
damage).
Necessary preliminary work:
Remove ENGINE
Use special tool 11 8 541 to mount engine on special tool 00 2 300 .
Mount engine or engine block with special tool 11 8 542 on 11 8 541.
Fig. 29: Mounting Engine Using Special Tools

11 00... OVERVIEW OF CONSUMABLES (ELECTRONIC PARTS CATALOGUE)
1.0 Sealing compound for injection.
SEALING COMPOUND REFERENCE CHART - INJECTION

Designation, Part number,
Repair instructions Electronic Parts Electronic Parts Application
(engine) Catalogue Catalogue examples
1.1 N40, N42, N45, Loctite 171000 83 19 7 515 683 For hardening
N46, N43, N45N, primer Loctite 128367
N46N sealing compound
2010 BMW Z4 30i
1.2 N40, N42, N45, Loctite 128357 liquid 83 19 7 536 051 Sealing between
N46, N43, N45N, gasket crankcase upper and
N46N lower halves
1.3 N51, N52, N53, Loctite 171000 83 19 7 515 683 For hardening
N54, N52N, N55 primer Loctite 193140
sealing compound
N54, N52N, N55 gasket crankcase upper and
lower halves
1.5 S65, S85 Loctite 171000 83 19 7 515 683 For hardening
primer Loctite 193140
sealing compound
1.6 S65, S85 Loctite 193140 liquid 83 19 0 439 030 Sealing between
gasket crankcase upper and
lower halves
2.0 Sealing compound for application.
SEALING COMPOUND REFERENCE CHART - APPLICATION

Designation in Electronic Parts Electronic Parts Application
repair instructions Catalogue Catalogue examples
2.1 M41, M47, M47TU, Drei Bond 1209 07 58 9 062 376 For sealing
M47T2, M50, M51, liquid gasket separation points on
M52, M52TU, M54, crankcase
M57, M57TU,
M57T2, M60, M62
N40, N42, N45,
N45N, N46, N46N,
N43, N47, N47top,
N47C N47D1
N51, N52, N52N,
N53, N54, N55,
N57, N57S
N62, N62TU, N63,
N73, N73H, N74
S14, S38, S50, S52,
S54, S62, S65, S85
N12, N14, N16,
N18
N18 gasket 83 19 0 404 517 crankcase upper and
W16, lower sections.
N47top, N47D1, Sealing of gear case
N47C1 cover, oil sump,
N57D1, coolant pump,
2010 BMW Z4 30i
component carrier.
N18 gasket cover sleeve and
W16 crankcase
3.0 Cleaning agent.
CLEANING AGENT REFERENCE CHART

3.1 N45, N46, N45T, Cold cleaner 83 19 0 026 956 Cleaning
N46T, N43, N51, (chlorine free) assemblies, washing
N52, N52Kp, engine
N52TU, N53, N55,
N63, N63S,
N63Hyprid, N74
4.0 Lubricant for application.
LUBRICANT REFERENCE CHART - APPLICATION

4.1 N20, N42, N46, Lubricating grease 83 19 2 160 340 For greasing the
N46TU, N51, N52, Longtime PD1 splined shaft on
N52KP, N52TU, actuator
N55, N62, N62TU, drive/gearing of
N73 intermediate shaft.
4.2 M47, M47TU, High temperature paste 83 19 2 152 323 For greasing the
M47T2, M57, threads on the
M57TU, M57T2, exhaust
turbocharger.
4.3 N12, N14, N16, High temperature paste 83 23 0 140 233 For greasing the
N18 (NEVERSEEZ threads on the
N40, N42, N45, compound) oxygen sensors.
N45TU N46,
N46TU, N43.
N51, N52, N52Kp,
N52TU, N53, N54,
N55.
N62, N62TU, N63,
N73, N73H, N74.
S65, S85.
4.4 N47, N47O1 Copper paste 81 22 9 400 794 For greasing the
N47C1, N47T double hex head bolt
2010 BMW Z4 30i
N47D1 on the exhaust

N57 N57D1 turbocharger.
5.0 Lubricants to loosen locked screw connections.
LUBRICANT REFERENCE CHART - SCREW CONNECTION

5.1 M47, M47TU, Brunox lubricating 83 23 0 445 529 For releasing the
M47TU2, M57, grease glow elements
M57TU, M57TU2.
N47, N47C, N47D1,
N57, N57D1,
W16, W17,
11..... REMOVING AND INSTALLING/REPLACING ACOUSTIC COVER (N54, N54T)
Release screws (1).
Raise acoustic cover slightly and remove towards front.
Fig. 30: Identifying Acoustic Cover Mounting Screws

11 00 050 REMOVING AND INSTALLING ENGINE (N54, N54T)
IMPORTANT: Aluminum screws/bolts must be replaced each time they are released.
2010 BMW Z4 30i
damage).
Disconnect BATTERY
Secure ENGINE HOOD/BONNET
Remove AIR FILTER HOUSING
Remove FAN COWL with electric fan
Remove RADIATOR
Remove CAPACITOR FOR HEATING AND AIR CONDITIONING SYSTEM
Remove CHARGE AIR COOLER
Remove EXPANSION TANK .
Detach all coolant hoses from engine
Remove rear AIR DUCT
Detach vacuum line from brake booster
Unfasten engine wiring harness from electronics box and lay to one side
Remove EXHAUST SYSTEM
Remove gearbox. See 2300018 REMOVING AND INSTALLING TRANSMISSION (GS6-53BZ)
N54 or 28 00 001 REMOVING AND INSTALLING TWIN-CLUTCH GEARBOX (GS7D36SG)
N54
Release LOWER SECTION OF STEERING SPINDLE from steering gear (do not remove)
Release grounding strap on left engine support arm.
Release nut (1) and disconnect positive battery cable (2) from positive battery connection point.
2010 BMW Z4 30i
Fig. 31: Identifying Battery Cable And Nut

Disconnect fuel lines (1).
Seal fuel lines with special tool 13 5 161 and
13 5 162.
Disconnect tank vent line (2).
Fig. 32: Identifying Tank Vent Line And Fuel Line

Release bolt (1) from engine oil pipe on oil-to-water heat exchanger.
2010 BMW Z4 30i
Remove engine oil pipe.
Installation note:
Replace all seals.
Fig. 33: Identifying Engine Oil Pipe Mounting Bolt

Secure special tool 11 8 680 to lifting eye on gearbox side.
Press locking pin (1) in direction of arrow until locking balls (2) are loose.
Secure special tool 11 8 680 to lifting eye. Release locking pin (1).
Installation note:
Special tool 11 8 680 is mounted correctly if the locking balls (2) are locked.
Special tool 11 8 680 is firmly secured to lifting eye.
2010 BMW Z4 30i
Fig. 34: Pressing Locking Pin

Attach special tool 11 0 000 to special tool 11 8 680 in eye (1).
Picture shows E9x.
Fig. 35: Connecting Special Tool 11 0 000 To Special Tool 11 8 680

Release nut (1) on engine mount on left and right.
Installation note:
Replace self-locking nut.
2010 BMW Z4 30i
Fig. 36: Identifying Engine Mount Nut

Screw in towing hook (1).
Suspend special tool (4) 11 0 000 from engine crane.
Suspend special tool 11 0 000 from the designated mounting eyelets (2) only.
Unscrew left and right engine mounts.
Remove left engine support arm.
Lift engine out with crane.
Fig. 37: Identifying Special Tools 11 0 000 And 11 8 680 On Engine Crane
Installation note:
Secure special tool (1) 11 7 310 to steering box.
2010 BMW Z4 30i
Fig. 38: Connecting Special Tool 11 7 310 To Steering Box

Assemble engine.
Observe following in case of REPLACEMENT ENGINE .
Check function of Digital Diesel Electronics.
00 RISK OF INJURY IF OIL COMES INTO CONTACT WITH EYES AND SKIN
Danger of injury!
Contact with eyes or skin may result in injury!
Possible symptoms are:
Impaired sight
Irritation of the eyes
Reddening of the skin
Rough and cracked skin
Protective measures/rules of conduct
Wear protective goggles

Wear oil-resistant protective gloves
Observe country-specific safety regulations
First aid measures
2010 BMW Z4 30i
Eye contact: Rinse eyes immediately with plenty of water for at least 15 minutes; if available, use an
eye-rinsing bottle. If irritation of the eyes persists, consult a doctor.
Skin contact: Wash off with soap and water immediately. If irritation persists, consult a doctor.
NOTE: Do not use solvents/thinners.
00 SAFETY INFORMATION FOR WORKING ON VEHICLES WITH AUTOMATIC ENGINE

START-STOP FUNCTION (MSA)
WARNING: If the engine hood/bonnet contact is pulled upwards (workshop mode),

the information "switch closed" is output. The automatic engine start-stop
function is active.
An automatic engine start is possible.
Observe safety precautions when working on MSA vehicles
Before carrying out practical work on the engine, always ensure that the MSA functionality is deactivated so as
to prevent automatic engine starting while work is being carried out in the engine compartment.
MSA function is deactivated by
Deactivate MSA by means of button (1) in passenger compartment

Open seat belt buckle and driver's door
Fig. 39: Identifying MSA Switch In Passenger Compartment

Open engine bonnet/hood and ensure that engine hood/bonnet contact is not in workshop mode
Workshop mode
A = 10 mm
Basic setting (engine hood/bonnet open)
B = 7 mm
2010 BMW Z4 30i
To make sure that the engine hood/bonnet contact is at the basic setting, if necessary press the hood/bonnet
contact up to the limit position before starting work and slowly release.
Fig. 40: Identifying Engine Hood/Bonnet Basic Setting And Workshop Mode
When working with diagnosis tools
Observe instructions in diagnosis tool
00 SAFETY INSTRUCTIONS FOR HANDLING OIL
WARNING: DANGER OF POISONING if oil is ingested/absorbed through the skin!
RISK OF INJURY if oil comes into contact with eyes and skin!
Recycling
Observe country-specific waste-disposal regulations.
Measures if oil is unintentionally released
Personal precautionary measures: Danger of slipping! Keep non-involved persons away from the work
area. Wear personal protective clothing/equipment.
Environmental protection measures: Prevent oil from draining into drain channels, sewerage systems,
pits, cellars, water and the ground.
Limiting spread: Use oil blocks to prevent the surface spread of oil.
Cleaning procedure: Bind and dispose of escaped oil with nonflammable absorbents.
NOTE: Do not flush oil away with water or aqueous cleaning agents.
11 00 670 SECURING ENGINE IN INSTALLATION POSITION (N54, N54T)
2010 BMW Z4 30i
WARNING: Danger of injury!
Observe following instructions relating to special tool:
1. Prior to each use, check the special tools for defects, modifications and operational reliability.
2. Damaged/modified special tools must not be used!
3. No changes or modifications may be made to the special tools!
4. Keep special tools dry, clean and free of grease.
Secure ENGINE HOOD/BONNET

Remove rear AIR DUCT
Assemble transverse member 00 6 000 with special tools 00 6 030.
Fig. 41: Assembling Transverse Member 00 6 000 Using Special Tools 00 6 030
Screw in towing hook (1).
2010 BMW Z4 30i
Fig. 42: Identifying Towing Hook

IMPORTANT: Avoid a change of engine position in the transverse or longitudinal direction.
Always make sure there is sufficient clearance between the engine (or its
attachment parts) and the body.
The support points on the left side are shown.
Position transverse member 00 6 030 with a 2nd person help on designated

areas (1, 2) of side panel.
2010 BMW Z4 30i
Fig. 43: Positioning Transverse Member 00 6 030 On Side Panel

Secure special tool 11 0 020 to spindle 00 6 002.
Fit suitable chains to special tool 11 0 020 and attach to engine towing hook or lifting eye.
Fig. 44: Connecting Special Tool 110 020 To Engine Towing Hook Or Lifting Eye
WARNING: Danger of injury!
Tighten down all adjusting screws and nuts on transverse member 00 6

000.
2010 BMW Z4 30i
Fig. 45: Identifying Transverse Member On Special Tool 00 6 030

Unscrew nuts (1).
Raise engine approx. 10 mm with transverse member.
Installation note:
Replace self-locking nuts.
Fig. 46: Identifying Engine Mount Nut

CYLINDER HEAD WITH COVER
2010 BMW Z4 30i
11 12 729 CHECKING CYLINDER HEAD FOR WATERTIGHTNESS (N54, N54T)
IMPORTANT: Pressure-test cylinder head to max. 3 bar.
Heat cylinder head to 60°.
Check for bubble formation in a water bath.
Remove CYLINDER HEAD .

Disassemble CYLINDER HEAD .
NOTE: Observe mounting of special tool 11 4 341 on cylinder no. 1
Secure special tool 11 4 341 using bolts 11 4 345 tightened to 25 Nm
Fig. 47: Identifying Special Tool 11 4 345 On Engine Cylinder

Extend special tool 11 4 341 with special tool 11 4 345.
Installation note:
1 cyl is marked.
2010 BMW Z4 30i
Fig. 48: Identifying Special Tool 11 4 341

Fit special tool 11 4 342 with bolts (1), insert knurled screw in direction of arrow.
Sealing flange must rest flat.
Fig. 49: Installing Special Tool (11 4 342)

Secure special tool 11 4 344 with screws (1).
NOTE: Compressed air at valve (2) must not exceed 3 bar.
Heat cylinder head to 60°.
Check for bubble formation in a water bath.
2010 BMW Z4 30i
Fig. 50: Identifying Special Tool (11 4 344) With Screws

Assemble engine.
11 12 719 MILLING CYLINDER HEAD SEALING SURFACE (N54, N54T)
IMPORTANT: Remachining on cylinder head max. 0.3 mm

Remove EXHAUST CAMSHAFT .
Remove INTAKE CAMSHAFT .
Remove ROLLER CAM FOLLOWERS .
Remove all VALVES .
Check evenness of cylinder head sealing faces with a standard straightedge (1).
NOTE: Max. deviation from flatness (longitudinal) 0.10 mm.
2010 BMW Z4 30i
Fig. 51: Checking Cylinder Head Sealing Faces Evenness Using Standard Straight-Edge
Check evenness of cylinder head sealing faces with a standard straightedge (1).
NOTE: Max. deviation from flatness (transverse) 0.05 mm
Fig. 52: Checking Cylinder Head Sealing Faces Evenness Using Standard Straight-Edge
Check cylinder head for WATER LEAKS .
Assemble engine.
11 12 100 REMOVING AND INSTALLING CYLINDER HEAD (N54, N54T)
2010 BMW Z4 30i
damage).
Remove ENGINE
Remove INTAKE AND EXHAUST CAMSHAFT ADJUSTERS
Release screws (1).
Unclip timing chain module (3) at junction (2) and remove towards top.
Set down timing chain.
IMPORTANT: If the timing chain is stowed in the gear case, the crankshaft must no longer be
rotated.
This would cause the timing chain on the crankshaft sprocket to jam or jump.
Fig. 53: Identifying Timing Chain Module And Screws

Installation note:
The timing chain is lifted out with a hook only during assembly.
NOTE: The lowest screw can only be released when the timing chain module is
pressed forward slightly.
2010 BMW Z4 30i
IMPORTANT: Secure the lowest screw with a gripper against falling down.
Release screws (1).
Fig. 54: Identifying Screws

IMPORTANT: Observe different bolt heads.
Release cylinder head bolts (1) M9 with special tool 11 4 420 .
Fig. 55: Removing M9 Cylinder Head Bolts Using Special Tool 11 4 420
Release cylinder head bolts (1) M10 with special tool 11 8 580 from outside inwards.
2010 BMW Z4 30i
IMPORTANT: All cylinder head bolts must be replaced.
Risk of damage!
Jointing torque and angle of rotation must be observed without fail.
Fig. 56: Removing M10 Cylinder Head Bolts Using Special Tool 11 8 580
Washers (1) of cylinder head bolts can only be removed with a magnet (2) between cylinder head and bearing
strip.
Fig. 57: Removing Cylinder Head Bolt Washer Using Magnet

Secure special tool 11 0 320 with existing cylinder head cover bolts (1).
IMPORTANT: Removing and install cylinder head with a second person helping.
2010 BMW Z4 30i
Weight of cylinder head with add-on parts is approx. 40 kg.
Do not set cylinder head down on sealing face, risk of damage to valves.
Fig. 58: Installing Cylinder Head Cover Using Special Tool 11 0 320
IMPORTANT: Set down cylinder head with intake and exhaust camshafts on side only, risk of
damage to valves (1).
Fig. 59: Identifying Valves

Insert 11 4 430 special tool into bore holes.
2010 BMW Z4 30i
Fig. 60: Inserting Special Tool 11 4 430 Into Bore Holes

Remove coarse residues on sealing surfaces with special tool 11 4 471 from cylinder head and crankcase.
IMPORTANT: Do not use any metal-cutting tools.
Fig. 61: Removing Coarse Residues On Sealing Surfaces Using Special Tool 11 4 471
Remove fine residues on sealing surfaces with special tool 11 4 472 from cylinder head and crankcase.
IMPORTANT: Do not use any metal-cutting tools.
2010 BMW Z4 30i
Fig. 62: Removing Fine Residues On Sealing Surfaces Using Special Tool 11 4 472
There must be no fluids or contaminants in any of the threaded holes (1) for the cylinder head bolt connections.
Risk of cracking and corrosion!
Clean all threaded holes.
Installation note:
Replace CYLINDER HEAD GASKET .
Fig. 63: Identifying Threaded Holes

IMPORTANT: Observe sequence for tightening cylinder head bolts without fail.
2010 BMW Z4 30i
Installation note:
Fit new cylinder head screws.
Insert cylinder head bolts (1 to 10) with special tool 11 8 580 .
Insert cylinder head bolts (11 to 14) with special tool 11 4 420 .
Fig. 64: Identifying Cylinder Head Bolts Tightening Sequence

NOTE: Graphic shows intake and exhaust camshafts removed.
Observe sequence for tightening cylinder head bolts without fail
IMPORTANT: The 2nd angle of rotation relates only to cylinder head bolts 1 to 10.
Installation note:
Jointing torque:
All cylinder head bolts 1 to 14 to 30 Nm
1st angle of rotation:
All cylinder head bolts 1 to 14 to 90°
2nd angle of rotation:
Only cylinder head bolts 1 to 10 to 90°
2010 BMW Z4 30i
3rd angle of rotation:
All cylinder head bolts 1 to 14 to 45°
Installation note:
Replace screws (1).
IMPORTANT: Secure the lowest screw with a gripper against falling down.

Assemble engine.
11 12 000 REMOVING AND INSTALLING/SEALING CYLINDER HEAD COVER (N54, N54T)
Disconnect BATTERY
Remove ROD-TYPE IGNITION COILS
Unclip injector WIRING HARNESS
Remove INJECTORS
Remove right TENSION STRUT
Disconnect vacuum lines (2) from vacuum lines (1).
Unclip vacuum lines (1).
2010 BMW Z4 30i
Fig. 66: Identifying Vacuum Lines

Disconnect vacuum lines (1) from vacuum lines (2).
Unclip vacuum line (2) and lay to one side.
Fig. 67: Identifying Vacuum Lines

Release screw (1) with special tool 11 8 620 .
2010 BMW Z4 30i
Fig. 68: Identifying Screw

Installation note: Slotted sleeves (2) for guiding ignition coils in cylinder head cover (1) must be replaced.
Remove slotted sleeves (2).
Fig. 69: Identifying Slotted Sleeves And Cylinder Head Cover

Release screws (1) on cylinder head cover.
2010 BMW Z4 30i
Fig. 70: Identifying Screws On Cylinder Head Cover

Release screws (1 and 2) along lines.

Installation note:
Replace gasket (1).
Press gasket (1) into cylinder head cover.
2010 BMW Z4 30i
Fig. 72: Identifying Gasket

Assemble engine.
11 12 101 REPLACING CYLINDER HEAD GASKET (N54, N54T)
Insert 11 4 430 special tool into bore holes.
Remove head gasket.
IMPORTANT: Check identification (1) on cylinder head gasket (N54).
Fig. 73: Inserting 11 4 430 Special Tool Into Bore Holes
2010 BMW Z4 30i
There must be no fluids or contaminants in any of the threaded holes (1) for the cylinder head bolt connections.
IMPORTANT: Work on sealing surface on engine block and on cylinder head with special tool
11 4 470 only.
Do not use any metal-cutting tools.
Fig. 74: Identifying Threaded Holes

Identification (1) of head gasket (N54).
Gasket (3) is a beaded metal gasket with rubber coating.
Fig. 75: Identifying Head Gasket Identification Mark

Check adapter sleeves (1) for damage and firm seating.
Place head gasket (2) in direction of arrow on engine block.

2010 BMW Z4 30i
Fig. 76: Placing Head Gasket

NOTE: Check cylinder head for DEVIATION FROM FLATNESS .
Check cylinder head for WATER LEAKS .
Assemble engine.
OIL SUMP
11 13 000 REMOVING AND INSTALLING, SEALING OR REPLACING OIL SUMP (N54, N54T)
IMPORTANT: When working on the engine oil, coolant or fuel circuit, you must protect the
alternator against contamination.
Risk of damage!
Cover alternator with suitable materials.
Failure to comply with this procedure may result in an alternator malfunction.
2010 BMW Z4 30i
damage).
Remove engine guard

Secure engine in INSTALLATION POSITION
LOWERING FRONT AXLE
Observe tightening specifications without fail during installation.
Drain and add ENGINE OIL
NOTE: On vehicles with option SA205 (automatic transmission), it is necessary to

remove the transmission oil cooler lines from the oil sump.
Release bolts (3) on transmission.
Detach return hose (2).
IMPORTANT: Bolts of oil sump have different lengths.
Observe different tightening torques.
Fig. 77: Identifying Return Hose With Bolts And Nuts

Release bolts along line (1).
Tightening torque 11 13 2 AND 3AZ .
Installation note:
2010 BMW Z4 30i
Replace aluminum screws.
If necessary, release nuts (4). Remove oil level sensor.
Installation note:
IMPORTANT: There must be no adhesive residues in the lower crankcase retaining threads.
Clean retaining threads and sealing surfaces.
Installation note:
Replace all seals.
Assemble engine.
HOUSING COVER
11 14 151 REPLACING CRANKSHAFT RADIAL SEAL (N54, N54T) UP TO 12.31.08
Remove transmission. See 2300018 REMOVING AND INSTALLING TRANSMISSION (GS6-

53BZ) N54 or 28 00 001 REMOVING AND INSTALLING TWIN-CLUTCH GEARBOX
(GS7D36SG) N54 .
Remove FLYWHEEL .
NOTE: Radial shaft seal has six removal openings for removal with special tool 11 9
200 .
2010 BMW Z4 30i
Fig. 78: Locating Crankshaft Radial Seal Removal Openings

NOTE: If necessary, remove rubber coating (1) on top side of radial shaft seal and
expose a removal opening (2) (see graphic).
Fig. 79: Identifying Rubber Coating And Removal Opening

Fit special tool 11 9 200 . Insert sheet metal screws into removal opening of radial shaft seal and fasten without
play (do not overtighten sheet metal screws).
Screw in spindle (1) slowly and carefully and detach radial shaft seal.
Fig. 80: Identifying Special Tool (11 9 200)

Installation note:
Clean sealing surface (1) and degrease thoroughly in area of housing partition.
Apply a light coat of oil to running surface (2) of radial shaft seal.
2010 BMW Z4 30i
Fig. 81: Identifying Radial Shaft Running Surface Seal

NOTE: Support bush (4) is supplied with radial shaft seal (1).
When radial shaft seal (1) is installed, only support bush (4) may be used as a
slip bush.
Radial shaft seal (1) has a groove (2) on both left and right sides.
IMPORTANT: After installation, grooves (2) must be filled with sealing compound.
Fig. 82: Identifying Crankshaft Radial Seal, Grooves And Bushing

IMPORTANT: The seal between the engine block and radial shaft seal is described below.
The engine block will not be leakproof at the outside of the radial shaft seal if
you fail to comply with the individual work steps and the work sequence.
NOTE: The required parts are available from the BMW Parts Department (Electronic
2010 BMW Z4 30i
Parts Catalogue).
Remove screw caps (1) from injector (2).
Screw on metering needle.
Insert piston for pressing out.
Injector (2) contains the sealing compound Loctite, manufacturer's number 193140.
Bottle (3) contains the primer Loctite, manufacturer's number 171000.
Fig. 83: Identifying Injector, Sealing Compound And Bottle

Installation note:
Fit support bush (4) with radial shaft seal (1) on crankshaft.
Align groove (2) centrally to housing partition (3).
Coat both grooves (2) on radial shaft seal (1) with Loctite primer, manufacturer's number 171000, and expose to
air for approx. one minute.
Push radial shaft seal (1) by hand as far as possible onto running surface.
Carefully remove support bush (4).
2010 BMW Z4 30i
Fig. 84: Identifying Support Sleeve With Radial Shaft Seal On Crankshaft
NOTE: Spacer ring (1) is supplied with radial shaft seal.
Screw special tool 11 9 182 with screws (special tool 11 9 184) to crankshaft.
Fit spacer ring (1) on preassembled radial shaft seal.
Fig. 85: Identifying Spacer Ring With Special Tool (11 9 182 And 11 9 183)
Draw in radial shaft seal and spacer ring with special tool 11 9 181 in conjunction with special tool 11 9 183.
Then remove spacer ring again.
2010 BMW Z4 30i
Fig. 86: Identifying Special Tool (11 9 181 And 11 9 183)

Before filling with sealing compound:
Insert brush with Loctite primer, manufacturer's number 171000, as far as possible into grooves (1) on radial
shaft seal and coat housing partition on engine block.
Fig. 87: Coating Surface Of Sealing Compound In Both Grooves Using Loctite Primer
Fill both grooves (1) flush with Loctite sealing compound, manufacturer's number 193140.
2010 BMW Z4 30i
Fig. 88: Filling Both Grooves Flush With Loctite Sealing Compound
Coat surface of sealing compound in both grooves (1) with Loctite primer, manufacturer's number 171000.
NOTE: Loctite primer, manufacturer's number 171000, binds the Loctite sealing
compound, manufacturer's number 193140, and prevents leakage.
Assemble engine.
11 14 151 REPLACING RADIAL CRANKSHAFT SEAL ON TRANSMISSION SIDE (N54N54T)

FROM 01.01.09
Remove FLYWHEEL
IMPORTANT: Magnet wheel (1) is magnetic.
2010 BMW Z4 30i
Keep magnet wheel (1) in a plastic bag away from metallic debris.
Remove magnet wheel (1) from crankshaft.
Fig. 90: Identifying Magnet Wheel

Release screw on pulse sensor (1).
Slide PULSE SENSOR (2) upwards.
Fig. 91: Identifying Pulse Sensor And Screw

IMPORTANT: Drill size maximum 2.5 millimeters.
Remove shavings immediately.
Drill a hole with a drill (1) in the radial shaft seal (see arrow).
2010 BMW Z4 30i
Fig. 92: Drilling Hole In Radial Shaft Seal Using Drill

Immediately carefully remove shavings on the radial shaft seal (1).
Fig. 93: Identifying Radial Shaft Seal

Screw in special tool 23 0 490 in direction of arrow.
Drive out radial shaft seal with impact weight in direction of arrow.
IMPORTANT: Immediately carefully remove residual shavings.
2010 BMW Z4 30i
Fig. 94: Screwing In Special Tool 23 0 490 In Clockwise Direction

Prepare radial shaft seal (1) on special tool 11 8 220.
Fig. 95: Identifying Radial Shaft Seal On Special Tool 11 8 220

Position the radial shaft seal (1) with special tool 11 8 220 on the crankshaft.
2010 BMW Z4 30i
Fig. 96: Positioning Radial Shaft Seal Using Special Tool 11 8 220 On Crankshaft
Brush radial shaft seal (1) over the special tool 11 8 220.
Move radial shaft seal (1) parallel up against the crankcase.
Fig. 97: Moving Radial Shaft Seal Parallel Up Against Crankcase

Fasten special tool 11 9 182 (synchronizing key) with special tool 11 9 184 (screw) on the crankshaft.
2010 BMW Z4 30i
Fig. 98: Fastening Special Tool 11 9 182 With Special Tool 11 9 184 On Crankshaft
Installation note:
Prepare special tool 11 9 181 (bush) for installation.
Connect special tool 11 9 185 (ring) onto special tool 11 9 181 (bush).
Fig. 99: Connecting Special Tool 11 9 185 Onto Special Tool 11 8 181
Pull on radial shaft seal with special tools 11 9 181 (bush) and 11 9 185 (ring) in combination with special tool
11 9 183 (nut).
2010 BMW Z4 30i
Fig. 100: Installing Rear Crankshaft Seal Using Tool 119 180/181
Screw on radial shaft seal with special tool 11 9 183 (nut) to limit position.
Fig. 101: Screwing On Radial Shaft Seal Using Special Tool 11 9 183
Remove all special tools.
Assemble engine.
11 14 005 REPLACING FRONT CRANKSHAFT SEAL (N54, N54T)
2010 BMW Z4 30i
Remove VIBRATION DAMPER
IMPORTANT: Do not release central bolt.
Risk of damage!
If the central bolt is released, the sprockets of the timing chain and the oil
pump will no longer be non-positively connected to the crankshaft. The
camshafts may turn in relation to the crankshaft.
The timing must be ADJUSTED again.
Fig. 102: Identifying Central Bolt

Turn back special tool 11 9 222.
Push special tool 11 9 221 onto crankshaft hub.
IMPORTANT: When screws are tightened down (special tool 11 9 224) crankshaft seal is
pressed inwards approx. 1 mm and thus slackened for subsequent removal.
Insert screws (special tool 11 9 224) and tighten down to approx. 20 Nm.
2010 BMW Z4 30i
Fig. 103: Identifying Special Tool (11 9 221, 11 9 224 And 11 9 222)
Screw special tool 11 0 371 to 80 Nm into crankshaft seal.
Screw in spindle 11 0 372.
Release crankshaft seal from crankcase.
NOTE: Repeat this operation several times if necessary.

Carefully saw open crankshaft seal (1) at cutting line (2).
Remove crankshaft seal (1) from special tool 11 0 371.
2010 BMW Z4 30i
Fig. 105: Identifying Crankshaft Radial Seal And Cutting Line

IMPORTANT: The following text describes installation and sealing between the engine block
and crankshaft seal.
The engine block will not be leakproof at the outside of the crankshaft seal if
you fail to comply with the individual work steps and the work sequence.
Installation note:
Clean sealing surface (1) and degrease thoroughly in area of crankcase partition.
Apply a light coat of oil to running surface (2) of the crankshaft seal.
NOTE: Graphic shows an N42 engine by way of example.
Fig. 106: Identifying Sealing Surface And Running Surface For Crankshaft Radial Seal
Screw special tool 11 9 232 with screws (special tool 11 9 234) to crankshaft hub.
2010 BMW Z4 30i

NOTE: Support bush (1) is supplied with crankshaft seal (2).
When crankshaft seal (2) is installed, only support bush (1) may be used as a
slip bush.
Crankshaft seal (2) has a groove on both left and right sides.
IMPORTANT: After installation, the grooves must be filled with sealing compound.
Fig. 108: Identifying Crankshaft Seal And Support Sleeve

NOTE: The required parts are available from the BMW Parts Department (Electronic
Parts Catalogue).
Remove screw caps (1) from injector (2).
Screw on metering needle.
2010 BMW Z4 30i
Insert piston for pressing out or use special tool 11 4 370 .

Push support bush (1) with crankshaft seal (2) onto special tool 11 9 232.
IMPORTANT: Support bush (1) remains on special tool 11 9 232 until crankshaft seal is drawn
in.
Align groove (3) centrally to crankcase partition (4).
Coat both grooves (3) on crankshaft seal (2) with Loctite primer, manufacturer's number 171000, and expose to
air for approx. one minute.
Fig. 110: Identifying Sleeve, Crankshaft Seal, Groove And Housing Partition With Special Tool (11 9 232)
Draw in crankshaft seal with special tool 11 9 231 in conjunction with special tool 11 9 233 until flush.
2010 BMW Z4 30i

Before filling with sealing compound:
Insert brush with Loctite primer, manufacturer's number 171000, as far as possible into grooves (1) on
crankshaft seal and coat crankcase partition on engine block.
Fig. 112: Inserting Brush With Loctite Primer Into Grooves On Crankshaft Seal
Using injector/syringe (2), fill both grooves (3) flush with sealing compound.
2010 BMW Z4 30i
Fig. 113: Filling Grooves Flush With Sealant Using Injector/Syringe

NOTE: Loctite primer, manufacturer's number 171000, binds the Loctite sealing
compound, manufacturer's number 128357, and prevents leakage.
Coat surface of sealing compound in both grooves (1) with Loctite primer,
manufacturer's number 171000.
11 14 010 REPLACING SEALING CAP FOR VACUUM PUMP (N54, N54T)
2010 BMW Z4 30i
Remove FAN COWL

Remove alternator DRIVE BELT
Remove both drive belt TENSIONERS
NOTE: For purposes of clarity, graphics show alternator and power steering pump
removed.
Secure special tool 11 8 535 with special tools 11 8 531 and 11 8 537.
Fig. 115: Identifying Special Tools 11 8 535, 11 8 531 And 11 8 537

Position special tool 11 8 537 by hand on sealing cover.
Screw in special tool 11 8 534.
NOTE: The sealing cover is pressed out diagonally during this work step
Fig. 116: Identifying Special Tools 11 8 537 And 11 8 534

2010 BMW Z4 30i
Screw in new sealing cover (1) with special tools 11 8 532 and 11 8 533 until flush with crankcase upper
section.
Fig. 117: Identifying Sealing Cover With Special Tools 11 8 532 And 11 8 533
Assemble engine.
CRANKSHAFT WITH BEARING

11 22 500 REMOVING AND INSTALLING/REPLACING FLYWHEEL (N54, N54T)
Remove 28 00 001 REMOVING AND INSTALLING TWIN-CLUTCH GEARBOX (GS7D36SG)

N54
Remove CLUTCH
Enlarge special tool 11 9 260 with an elongated hole.
Enlarge elongated hole on special tool 11 9 260 to 8 mm.
2010 BMW Z4 30i
Fig. 118: Identifying Slot Dimension On Special Tool 11 9 260

For vehicles with manual gearboxes
Secure flywheel with special tool 11 9 260 .
Release flywheel bolts with special tool 11 4 180 /
Installation note:
The flywheel is secured with a dowel pin.
Fit new flywheel screws
Fig. 119: Removing Flywheel Screws Using Special Tool 11 4 180

For vehicles with automatic transmissions
Release flywheel screws with a suitable tool (1).
Installation note:
2010 BMW Z4 30i
Fig. 120: Mounting Flywheel Using Special Tool 11 9 260

Assemble engine.
11 21 531 REPLACING ALL CRANKSHAFT MAIN BEARINGS (N54, N54T)
Aluminum screws/bolts are permitted with and without color coding (blue).
damage).
Remove CRANKSHAFT
Check setting of oil spray nozzles, adjusting if necessary
Attach special tool 11 8 510 to main bearing screw connection, secure with bolt (1).
Installation note:
The oil nozzle must be located precisely in the groove of special tool 11 8 510 .
If necessary, adjust oil nozzle.
2010 BMW Z4 30i
Fig. 121: Locating Oil Nozzle In Groove Of Special Tool 11 8 510

Adjust oil nozzle.
Release screw (1).

Remove bearing shells (2) and (3).
NOTE: Guide bearing shell (3) is a thrust bearing.
Observe bearing classification. See CRANKSHAFT AND BEARINGS ; CRANKSHAFT AND BEARINGS
N54/B30 ; CRANKSHAFT AND BEARINGS N54/B30 or CRANKSHAFT AND BEARINGS N54/B30 .
2010 BMW Z4 30i
Fig. 123: Identifying Bearing Shells

Installation note:
Bearing shell (1) with lubricant groove must be fitted in crankcase upper section.
Bearing shell (2) without lubricant groove must be fitted in crankcase lower section (bedplate).
IMPORTANT: Allocation of bearing points:
Bearing point 1 is at the front on the timing chain drive in the direction of
travel.
Fig. 124: Identifying Bearing Shell

Main bearing classification (1) for crankcase lower half (bedplate), code numbers 1 2 3, see table.
Observe bearing classification. See CRANKSHAFT AND BEARINGS ; CRANKSHAFT AND BEARINGS
N54/B30 ; CRANKSHAFT AND BEARINGS N54/B30 ; CRANKSHAFT AND BEARINGS N54/B30 .
2010 BMW Z4 30i
Bearing classification (2) of CONNECTING RODS code letters b and r.
Fig. 125: Identifying Bearing Classifications

Main bearing classification (1) in crankcase, code letters A/B or C, see table.
Installation note:
When all the letters and number code have been determined, the bearing shell color must be allocated.
Fig. 126: Identifying Bearing Classification Of Crankcase Upper Section

Installation note:
The letter/number combination produces a bearing shell pairing.
Identification by different colors.
IMPORTANT: First bearing point is on the timing drive.
2010 BMW Z4 30i
The color combination Yellow and Red must not be fitted.
Engine damage will result if excessively small bearing play is determined.
Code letters on crankcase
Code letter A = bearing shell (1) color Yellow.
Code letter B = bearing shell (1) color Green.
Code letter C = bearing shell (1) color Red.
Code numbers on crankshaft
Code number 1 = bearing shell (2) Yellow.
Code number 2 = bearing shell (2) Green.
Code number 3 = bearing shell (2) Red.

IMPORTANT: The color combination Yellow and Red must not be fitted; the bearing colors
Green/Green must be selected for this color combination, see table.
Installation example
For bearing 1 with code letter A on the crankcase and code number 1 on the crankshaft bearing shell (1) with
the color Yellow is required for the crankcase and bearing shell (2) with the color Yellow for the crankcase
lower half (bedplate).
2010 BMW Z4 30i

Lager 2: A and 2 colors Yellow and Green.
Lager 3: B and 2 colors Green and Green.
Lager 4: C and 2 colors Red and Green.
Lager 5: B and 1 colors Green and Yellow.
Lager 6: C and 3 colors Red and Red.
Lager 7: C and 1 colors Green and Green.
The color combination Yellow and Red must not be fitted.
Installation note:
Possible color combinations for mounting the crankshaft in the crankcase.
CRANKCASE COLOR CODE REFERENCE CHART

(A 1) Crankcase/Yellow (B 1) Crankcase/Green (C 1) Crankcase/Green
(A 1) Crankcase lower (B 1) Crankcase lower (C 1) Crankcase lower half/Green
half/Yellow half/Yellow
CRANKCASE COLOR CODE REFERENCE CHART

(A 2) Crankcase/Yellow (B 2) Crankcase/Green (C 2) Crankcase/Red
(A 2) Crankcase lower half/Green (B 2) Crankcase lower half/Green (C 2) Crankcase lower half/Green
(A 3) Crankcase/Green (B 3) Crankcase/Green (C 3) Crankcase/Red
(A 3) Crankcase lower half/Green (B 3) Crankcase lower half/Red (C 3) Crankcase lower half/Red
Insert all bearing shells (2 and 3).
2010 BMW Z4 30i
IMPORTANT: Clean sealing surfaces.
Do not clean sealing faces with a metal-cutting tool.
Only use special tool 11 4 470 to clean sealing surfaces.
Determine bearing play with special tool 00 2 590 .

Installation note:
All measuring points must be free from oil and grease.
Use used screws to determine bearing play.
Set up crankcase lower section (bedplate) with bearing shells.
Remove crankcase lower section (bedplate).
Read off bearing play at width of flattened plastic thread and measurement scale.
Crankshaft bearing play radial .
Installation note:
Remove plastic thread.
Apply a light coat of oil to bearing shells and crankshaft.
2010 BMW Z4 30i
Fig. 130: Checking Radial Clearance At Width Of Flattened Plastic Thread (Plastigage)
Install crankcase lower section (bedplate).
Assemble engine.
11 21 500 REPLACING CRANKSHAFT (N54, N54T)
damage).
Remove ENGINE
Mount engine on ASSEMBLY STAND
Remove OIL SUMP
Remove OIL PUMP
Remove TRIANGULAR DRIVE for oil pump
Remove TIMING CHAIN MODULE
Remove CYLINDER HEAD.
2010 BMW Z4 30i
Remove FLYWHEEL
Removing all PISTONS
Release screws (1).
Installation note:
Remove oil deflector (2).
Fig. 131: Identifying Screws And Oil Deflector

Release screws (1).
Unfasten screws (2).
Installation note:
2010 BMW Z4 30i
Fig. 132: Identifying Aluminum Screws

Release screws (1).
Installation note:
Release steel screws (1 to 14) from outside inwards.
Fig. 133: Identifying Steel Screws

2010 BMW Z4 30i
Release screws (1).
Installation note:
Remove crankshaft lower section in upward direction.

Remove both crankshaft seals (1).
NOTE: Graphic shows N46.
Fig. 135: Identifying Crankshaft Radial Seals

Remove MAIN BEARING SHELLS (2 and 3), replace if necessary.
2010 BMW Z4 30i
Remove and install crankshaft (1) in direction of arrow.
IMPORTANT: Remove crankshaft with aid of a second person.
Weight of crankshaft approx. 25 kg.

Check guide sleeves (1) for damage and correct seating.
Reinstall crankshaft.
Installation note:
Lubricate all bearing points with engine oil.
Clean all sealing surfaces.
2010 BMW Z4 30i
Fig. 137: Identifying Adapter Sleeves

Tighten steel screws (1 to 14) from inside outwards.
Tighten screws (2) from inside outwards.
Tighten screws (1).
Installation note:
Fig. 138: Identifying Steel Screws

Tighten aluminum screws exclusively with special tool 00 9 120 .
IMPORTANT: In the case of aluminum screws, jointing torque and angle of rotation must be
observed without fail.
2010 BMW Z4 30i
Fig. 139: Tightening Main Bearing Bolts Using Special Tool (00 9 120)
Set up stand with magnetic base on special tool 11 4 440.
Set up special tool 00 2 510 on stand.
Position special tool 00 2 510 on crankshaft.
Move crankshaft in direction of arrow.
Determine bearing play. See CRANKSHAFT AND BEARINGS ; CRANKSHAFT AND BEARINGS
N54/B30 ; CRANKSHAFT AND BEARINGS N54/B30 ; or CRANKSHAFT AND BEARINGS N54/B30 .
Fig. 140: Setting Up Stand With Magnetic Base On Special Tool 11 4 440
Installation note:
Always replace nozzles (1).
Drive in both nozzles (1) with special tool 11 9 360 on left and right into crankcase.
2010 BMW Z4 30i
Fig. 141: Inserting Nozzles Using Special Tool 11 9 360

Installation note:
CRANKSHAFT SEAL - replace front.
CRANKSHAFT SEAL - replace rear.
Installation note:
Use PRIMER 1.3 AND LIQUID GASKET 1.4.
Prepare liquid sealing compound (1) in special tool 11 4 370 .
Screw on nozzle for injecting liquid gasket.

Slowly insert liquid sealing compound (1) with special tool 11 4 370 in direction of arrow.
2010 BMW Z4 30i
Fig. 143: Inserting Liquid Sealing Compound Using Special Tool 11 4 370
Stop (seal off) escaping liquid sealing compound with primer 1.3.
(Graphic shows N40).
Fig. 144: Stopping Escaping Liquid Sealing Compound Using Primer

Assemble engine.
11 21 505 SEALING CRANKCASE LOWER SECTION (N54, N54T)
IMPORTANT: Aluminium-magnesium materials.
No steel screws/bolts may be used due to the threat of electrochemical

corrosion.
A magnesium crankcase requires aluminum screws/bolts exclusively.
2010 BMW Z4 30i
Aluminum screws/bolts must be replaced each time they are released.
Risk of damage!
Jointing torque and angle of rotation must be observed without fail.
IMPORTANT: Changed procedure.
It is not necessary to remove the cylinder head and the crankshaft.
Remove ENGINE .
MOUNT ENGINE ON ASSEMBLY STAND .
Remove CLUTCH (if fitted).
Remove left and right engine support arm. See 2211100 REPLACING RIGHT ENGINE SUPPORT
ARM (N54) ; or 2211110 REPLACING LEFT ENGINE SUPPORT ARM (N54)
Remove OIL SUMP .
Release screws (1).
Pull out oil pump intake pipe (2).
Tightening torque: 11 13 5AZ
Fig. 145: Removing Pump Intake Pipe

2010 BMW Z4 30i
Release screws (1).
Tightening torque: 11 13 5AZ .
Installation note:
Remove oil deflector (2).
Fig. 146: Identifying Oil Deflector And Screws

Secure oil pump drive gear with 6.0 mm dia. steel pin (3) to oil pump.
IMPORTANT: Release central bolt (2) only together with 6.0 mm dia. steel pin (3).
Do not remove sprocket.
Release central bolt (2).
2010 BMW Z4 30i
Fig. 147: Identifying Oil Pump Drive Gear And Steel Pin
Installation note:

Remove screw plug (1) from crankcase at front.
NOTE: Replace gasket.
2010 BMW Z4 30i
Fig. 149: Identifying Screw Plug

Release screw (1) for oil pump triangular drive with special tool 11 8 640 .
NOTE: It is not necessary to remove the triangular drive.
Fig. 150: Identifying Oil Pump Triangular Drive Mounting Screw

Version 1
IMPORTANT: Observe different screw lengths.
2010 BMW Z4 30i
Release screws (1).
Installation note:

Version 2
IMPORTANT: Observe different screw lengths.
Release oil pump screws (1).
Installation note:
2010 BMW Z4 30i
Fig. 152: Identifying Oil Pump Mounting Screws

Detach sprocket (1) in direction of arrow.
NOTE: The chain tensioner pushes the timing chain (3) of the triangular drive upward.
Do not remove camshaft sprocket.
Remove oil pump (2) in direction of arrow.
Fig. 153: Removing Sprocket

Installation note:
Check spacer bushings (1) for secure seating and damage; replace if necessary.
2010 BMW Z4 30i
Align twin surface (3) on oil pump (2) to sprocket wheel.
Install oil pump (2).
Fig. 154: Identifying Spacer Bushings And Oil Pump

NOTE: The dowel hole for the TDC setting is located on the intake side underneath the
starter motor.
Rotate engine at central bolt and secure flywheel in position with special tool 11 0 300 .
Fig. 155: Securing Flywheel In Position Using Special Tool 11 0 300

Secure flywheel with special tool (1) 11 9 260 and special tool (2) 11 9 266.
NOTE: Make sure that the special tool (1) completely engages in the flywheel teeth (see
arrow)
2010 BMW Z4 30i
Fig. 156: Securing Flywheel Using Special Tool 11 9 260 And Special Tool 11 9 266
Automatic transmission
Release flywheel bolts (1).
Release special tool (2).
Remove flywheel (3).
Fig. 157: Identifying Flywheel With Mounting Bolts

Manual transmission
2010 BMW Z4 30i
IMPORTANT: Position crankshaft at top dead center.
Remove dual-mass flywheel.
Remove VIBRATION DAMPER .
Fig. 158: Removing Flywheel Bolts Using Special Tool 11 4 180

2010 BMW Z4 30i
Fig. 159: Identifying Crankcase Bolts

Release all crankcase bolts (1) along line (2).
2010 BMW Z4 30i
Fig. 160: Identifying Crankcase Bolt Tightening Sequence

Release crankcase bolts M10 in sequence 14 to 1.
Release crankcase lower section (1) from crankcase upper section (2) with suitable tool (3)
Remove crankcase lower section (1) upwards.
IMPORTANT: Do not rotate crankshaft without crankcase lower section (1) (risk of damage).
2010 BMW Z4 30i
Fig. 161: Removing Crankcase Lower Section From Upper Section Using Tool
IMPORTANT: Timing chain is preloaded.
Do not raise crankshaft.
Carefully remove radial shaft seal (1).
Catch escaping engine oil with a cloth (2).
Fig. 162: Removing Radial Shaft Seal

2010 BMW Z4 30i
Carefully remove radial shaft seal (1) towards front.
Catch escaping engine oil with a cloth (2).
Fig. 163: Catching Escaping Engine Oil Using Cloth

IMPORTANT: Protect crankcase against sealant residues with a cloth (1).
Fig. 164: Protecting Crankcase Against Sealant Residues Using Cloth

Remove sealing compound residues (1) with special tool 11 4 470 .
2010 BMW Z4 30i
Remove injector nozzles (2) for liquid sealing compound on left and right.
Installation note:
Replace injector nozzles (2).
Clean all threads with compressed air.
Fig. 165: Identifying Injector Nozzle And Sealing Compound Residue

Position crankcase lower section (1) on crankcase upper section.
Screw in all M10 crankcase bolts.
Joint all M10 crankcase bolts (1) 20 NM from inside outwards.
2010 BMW Z4 30i
Fig. 166: Positioning Crankcase Lower Section On Crankcase Upper Section

Identify all M10 crankcase bolts with a colored marking (1) for checking.
Fig. 167: Identifying M10 Crankcase Bolts With Colored Marking

2010 BMW Z4 30i
Fig. 168: Identifying M10 Crankcase Bolts Tightening Sequence

Secure crankcase bolts M10 in sequence 1 to 14 with special tool 00 9 120 .
2010 BMW Z4 30i
Fig. 169: Identifying Crankcase Bolts

Insert all crankcase bolts (1).
IMPORTANT: Observe different lengths and sizes of the bolts.
Tightening torque: 11 11 2, 3 AND 4AZ.
Tighten screw (1) for oil pump triangular drive with special tool 11 8 640 .
NOTE: Replace screw.
Tightening torque: 11 41 4 AZ .
2010 BMW Z4 30i
Fig. 170: Identifying Oil Pump Triangular Drive Mounting Screw

Tighten screw plug on front of crankcase.
Tightening torque: 11 41 8.
Installation note:
Fig. 171: Identifying Screw Plug On Front Of Crankcase

Prepare radial shaft seal (1) on special tool 11 8 220.
2010 BMW Z4 30i
Fig. 172: Identifying Radial Shaft Seal On Special Tool 11 8 220

Position radial shaft seal (1) with special tool 11 8 220 on crankshaft.
Fig. 173: Positioning Radial Shaft Seal On Crankshaft Using Special Tool 11 8 220
Brush radial shaft seal (1) over special tool 11 8 220.
Move radial shaft seal (1) parallel up against the crankcase.
2010 BMW Z4 30i
Fig. 174: Moving Radial Shaft Seal Parallel Up Against Crankcase

Screw special tool 11 9 182 with screws (special tool 11 9 184) to crankshaft.
Fig. 175: Mounting Special Tool 11 9 182 Over Crankshaft Using Screws
Installation note:
Prepare special tool 11 9 181 for installation. Connect special tool 11 9 185 onto special tool 11 8 181.
2010 BMW Z4 30i
Fig. 176: Connecting Special Tool 11 9 185 To Special Tool 11 8 181

Pull on radial shaft seal with special tool 11 9 181 and 11 9 185 in combination with special tool 11 9 183.
Fig. 177: Pulling Radial Shaft Seal Using Special Tool 11 9 181/11 9 185/11 9 183
Screw on radial shaft seal with special tool 11 9 183 to limit position.
2010 BMW Z4 30i
Fig. 178: Installing Radial Shaft Seal Using Special Tool 119 183
Installation note:
Clean sealing surface (1) and degrease thoroughly in area of housing partition.
Apply a light coat of oil to running surface (2) of radial shaft seal.
NOTE: Graphic N42.
Fig. 179: Identifying Sealing Surface And Running Surface For Crankshaft Radial Seal
Push radial shaft seal (1) 11 9 235carefully in direction of arrow on the special tool.
2010 BMW Z4 30i
Fig. 180: Pushing Radial Shaft Seal 11 9 235 Carefully On Special Tool
IMPORTANT: 11 9 235Special tool can only be fastened with
2 opposite bolts.
Determine hole pattern on special tool.
Screw special tool 11 9 235 with special tool 11 9 234 on crankshaft.
Fig. 181: Identifying Special Tools On Crankshaft

2010 BMW Z4 30i
Align groove (2) of radial shaft seal (1) centered to the housing partition (3.
IMPORTANT: After installation, the grooves must be filled with sealing compound.
Fig. 182: Identifying Radial Shaft Seal Groove

Draw in radial shaft seal with special tool 11 9 231 in conjunction with special tool 11 9 233 until flush.
Fig. 183: Identifying Special Tools 119 231 And 11 9 233

Drive both injector nozzles (1) on left and right with special tool 11 9 360 into crankcase up to stop.
2010 BMW Z4 30i
Fig. 184: Installing Nozzles Using Special Tool 11 9 360

After fitting both sealing rings, check both sealing ducts for clearance.
Blow compressed air (1) at max. 6 bar into injector nozzle (2).
Compressed air must emerge at both sealing rings on left and right from the outlet bores.
IMPORTANT: If the compressed air does not flow out of all ducts. the crankcase must again
be taken apart and cleaned.
Fig. 185: Blowing Compressed Air Into Injector Nozzle

Installation note:
Use PRIMER 1.3 AND LIQUID SEAL 1.4 .
2010 BMW Z4 30i
Prepare liquid sealing compound (1) in special tool 11 4 370 .
Injector nozzles for injecting sealing compound are not required.
Fig. 186: Identifying Liquid Sealing Compound, Injector Nozzles And Primer Bottle
Slowly insert liquid sealing compound (1) with special tool 11 4 370 in direction of arrow.
Liquid sealing compound must emerge at radial shaft seals at front and rear.
Fig. 187: Inserting Liquid Sealing Compound Using Special Tool 11 4 370
2010 BMW Z4 30i
Fig. 188: Stopping Escaping Liquid Sealing Compound With Primer

Fig. 189: Stopping Escaping Liquid Sealing Compound With Primer

Assemble engine.
FLYWHEEL
11 22 500 REMOVING AND INSTALLING/REPLACING FLYWHEEL (N54, N54T)
Remove TWIN-CLUTCH GEARBOX (GS7D36SG) N54

Remove CLUTCH
Enlarge special tool 11 9 260 with an elongated hole.
2010 BMW Z4 30i
Enlarge elongated hole on special tool 11 9 260 to 8 mm .
Fig. 190: Identifying Special Tool 11 9 260 With Elongated Hole

For vehicles with manual gearboxes
Installation note:
Fig. 191: Removing Flywheel Bolts Using Special Tool 11 4 180

2010 BMW Z4 30i
For vehicles with automatic transmissions
Release flywheel screws with a suitable tool (1).
Installation note:
Fig. 192: Removing Flywheel Screws Using Tool

Assemble engine.
11 22 513 REPLACING ROLLER BEARING FOR DUAL-MASS FLYWHEEL
TRANSMISSION removed.
Remove CLUTCH RELEASE BEARING
Pressing out roller bearing
Install special tool 23 4 031 in front of drive shaft spline teeth.
Screw in grease spindle 23 4 033 completely.
2010 BMW Z4 30i
Brass tip must immerse fully into roller bearing.
Press in grease with grease gun 23 4 040 until roller bearing is disengaged from drive shaft.
When tensioning spring is compressed to full extent, release grease spindle and twist out slightly until spring is
relieved.
Repeat grease press-in procedure until roller bearing has released completely.
Fig. 193: Identifying Special Tools 23 4 033, 23 4 031 And 23 4 040

Remove special tool 23 4 031.
Remove pressed-in grease (1) from drive shaft completely.
Then reinstall special tool.
Fig. 194: Identifying Pressed-In Grease On Drive Shaft

Pressing in roller bearing
2010 BMW Z4 30i
Slide in pressure spindle 23 4 035.
Attach thrust piece 23 4 036 to pressure spindle.
Push roller bearing (1) onto thrust piece.
Fig. 195: Pushing Roller Bearing

Screw in pressure spindle (1) until roller bearing is fully pressed in.
Fig. 196: Installing Pressure Spindle

VIBRATION DAMPER
11 23 010 REMOVING AND INSTALLING/REPLACING VIBRATION DAMPER (N54, N54T)
Remove front underbody protection
2010 BMW Z4 30i
Remove drive belt
Release screws (1).
Remove vibration damper (2).
Fig. 197: Identifying Vibration Damper Screws

Assemble engine.
CONNECTING ROD WITH BEARING

11 24 571 REPLACING ALL CONNECTING ROD BEARINGS (N54, N54T)
IMPORTANT: All crank pins are connected with the crankshaft.
Blue/Red bearing shell colors are no longer used in combination.
Remove all PISTONS .
IMPORTANT: All crankshaft crank pins are classified.
Bearing shell colors are different in the connecting and in the connecting rod
bearing cap.
Possible classifications per connecting rod at top and bottom:
r: Connecting rod = Yellow.
2010 BMW Z4 30i
Connecting rod bearing cap = Red.
b: Connecting rod = Violet.
Connecting rod bearing cap = Blue.
Fig. 198: Direction Of Fitting Color In Connecting Rod And Connecting Rod Bearing Cap
Only one color may be fitted per connecting rod and connecting rod bearing cap.
In direction of arrow from (1 to 2) crank pin (1 to 6).
Example:
Possible classification: rbbrrb.
Zyl 1: Classification r = rod side Yellow bearing cap side Red.
Zyl 2: Classification b = rod side Violet bearing cap side Blue.
Install new connecting rod bearing shells.
In each case insert only one color of bearing shell (1 and 2) for each connecting rod.
2010 BMW Z4 30i
Fig. 199: Identifying Bearing Shell Colors

Check connecting rod bearing clearance.
Piston in BDC position.
Fit special tool 00 2 590 (Plastigage type PG 1) to oil-free crankshaft.
Fit bearing cap so that pairing letters match up.
Fig. 200: Locating Bearing Cap Pairing Letters

IMPORTANT: Do not distort connecting rods or crankshaft.
Use the old connecting rod bolts to check connecting rod clearance.
Tighten down connecting rod bolts with special tool 00 9 120 .
2010 BMW Z4 30i
Fig. 201: Tightening Connecting Rod Bolts

Remove bearing cap. Read off bearing clearance at width of crushed plastic thread with aid of measuring scale.
CONNECTING ROD BEARING PLAY.
Remove plastic thread

Coat crankshaft and bearing shells with oil.
Install new connecting rod bolts and tighten down with special tool 00 9 120 .
Fig. 202: Checking Connecting-Rod Bearing Play

Assemble engine.
PISTON WITH RINGS AND PIN

11 25 530 REMOVING AND INSTALLING OR REPLACING ALL PISTONS (N16)
2010 BMW Z4 30i
WARNING: Protective goggles must be worn when working on the gudgeon pin
circlip.
IMPORTANT: If pistons, connecting rods and bearing shells are reused, they must be
reinstalled in the same places.
Connecting rods and connecting rod bearing caps are denoted with the same pairing letters; mixing them up will
result in engine damage.
Piston and gudgeon pins are paired and must not be fitted individually.
Remove engine.
Mount engine on assembly stand.
Remove intake plenum.
Remove cylinder head.
Remove oil sump.
Remove oil pump.
NOTE: In event of heavy oil carbon residue:
Carefully remove oil carbon residue from cylinder wall.
Fig. 203: Locating Oil Carbon Residue

NOTE: Mark all pistons and conrods with a pen prior to removing.
2010 BMW Z4 30i
Example N14:
Direction of arrow (1) points to camshaft drive.
Cylinder allocation (2) per cylinder.
Fig. 204: Identifying Camshaft Drive Direction And Cylinder Allocation

NOTE: Mark all pistons and conrods with a pen prior to removing.
Example:
Mark cylinder assignment (1) for the respective cylinder.
Direction of arrow (2) points to timing chain drive.
Fig. 205: Identifying Timing Chain Drive Direction And Cylinder Assignment Marks
Release connecting rod bolts (1).
2010 BMW Z4 30i
Tightening torque, 11 24 1AZ .
Remove conrod bearing cap.
IMPORTANT: Connecting rods and connecting rod bearing caps are denoted with the same
pairing letters; mixing them up will result in engine damage.
Fig. 206: Removing Connecting Rod Bolts

11 9 620 Attach special tool in conrod big end.
Press out connecting rod and piston to cylinder head side.
Fig. 207: Attaching Special Tool (11 9 620) In Conrod Big End
WARNING: Safety goggles must be worn for the next operation.
WARNING: Safety goggles must be worn.
2010 BMW Z4 30i
IMPORTANT: Piston and gudgeon pins are paired and must not be fitted individually.
Lever out piston pin circlip with a screwdriver in direction of arrow.
Fig. 208: Removing Piston Pin Circlip

If necessary, replace connecting rods.
Installation note:
The gudgeon pin must be able to be pressed through the liner by hand with little force and must not display any
significant play.
Fig. 209: Installing Gudgeon Pin

Measure piston installation clearance:
Measure piston diameter with micrometer at measuring point A from lower edge of piston and offset by 90° to
piston pin axis.
2010 BMW Z4 30i
Piston diameter at measuring point A.
Fig. 210: Measuring Piston Diameter

Adjust micrometer to cylinder bore of engine block. Set internal calliper on micrometer to zero. Measure
bottom, center and top of cylinder bore in direction of travel and direction of engine rotation.
Diameter of cylinder bore.
Piston installation clearance.
Total permissible wear tolerance.
If necessary, replace piston.
Fig. 211: Checking Cylinder Bore Diameter

Install all piston rings.
Install all bearing shells.
Coat piston and piston rings with oil.
2010 BMW Z4 30i
11 9 670 Pre-install piston in special tool.
Screw special tool 11 9 620 into connecting rod.
Installation note:
11 9 620 Check protective lugs on special tool for correct position and damage.
Fig. 212: Identifying Special Tool 11 9 620 And 11 9 670

Insert piston with connecting rod in cylinder.
IMPORTANT: Risk of breakage of piston rings.
Press in piston with finger pressure only, do not drive in (see arrows).
Insert piston (1) so that arrow on piston crown points to camshaft drive.
If reusing the pistons, assign cylinder allocation (2) to correct cylinder.
Press in piston with special tool 11 9 670.
2010 BMW Z4 30i
Fig. 213: Inserting Piston With Connecting Rod In Cylinder

IMPORTANT: Point of fracture (1) on conrod.
Conrod and conrod bearing cap are identified with pairing letters (2) and must
not be mixed up.
Mixing them up or incorrectly fitting the connecting rod bearing cap on the big
end will result in engine damage.
Both pairing letters (2) must be together on one side.
Fig. 214: Identifying Connecting Rod Pairing Letters

Apply a light coat of oil to crankshaft journals.
Attach connecting rod to crankshaft journal.
Remove special tool 11 9 620.
2010 BMW Z4 30i
Fig. 215: Attaching Special Tool (11 9 620) In Conrod Big End
Fit bearing caps (2) so that pairing letters match up.
Check cylinder identification markings (1).
Direction of arrow (2) points to timing chain drive.
Fig. 216: Identifying Timing Chain Drive Direction And Cylinder Assignment Marks
Install new connecting rod bolts (1).
00 9 120 Carry out torsion angle tightening of conrods with special tool.
Tightening torque: 11 24 1AZ
2010 BMW Z4 30i
Fig. 217: Removing Connecting Rod Bolts

Assemble engine.
11 25 530 REMOVING AND INSTALLING/REPLACING ALL PISTONS (N54, N54T)
WARNING: Protective goggles must be worn when working on the piston pin circlip.
IMPORTANT: If pistons, connecting rods and bearing shells are reused, they must be
reinstalled in the same places.
Individual connecting rod replacement is not permitted; they are classified by

weight group.
Connecting rods and connecting rod bearing caps are marked with the same
Piston and gudgeon pins are paired and must not be fitted individually.
Remove ENGINE
Mount engine on ASSEMBLY STAND
Remove intake PLENUM
Remove CYLINDER HEAD
Remove OIL SUMP
Remove OIL PUMP
NOTE: In event of heavy oil carbon residue:
2010 BMW Z4 30i
Carefully remove oil carbon residue from cylinder wall.
Fig. 218: Locating Oil Carbon Residue

Do not release screw (1).
OIL SPRAY NOZZLE (2) must not be maladjusted or bent.
If necessary, readjust (risk of damage).
Fig. 219: Identifying Screw And Oil Spray Nozzle

Release connecting rod bolts (1).
Remove connecting rod bearing cap (2) in direction of arrow.
2010 BMW Z4 30i
IMPORTANT: Connecting rods and connecting rod bearing caps are marked with the same
Fig. 220: Removing Connecting Rod Bearing Cap

Screw special tool 11 8 590 into big end of connecting rod.
Press out connecting rod and piston to cylinder head side.
IMPORTANT: Risk of damage to oil spray nozzle.
Fig. 221: Inserting Special Tool Into Big End Of Connecting Rod
Preliminary work
Secure special tool 11 8 561 in vice.
Secure piston (1) with connecting rod to special tool 11 8 561.
2010 BMW Z4 30i
Fig. 222: Securing Piston Using Special Tool 11 8 561

WARNING: Safety goggles must be worn for the next operation.
To lever out piston circlip (1), support with special tool 11 5 464 on piston (2).
Lever out piston circlip (1) with special tool 11 5 464 in direction of arrow.
Fig. 223: Removing Piston Circlip Using Special Tool 11 5 464

Installation note:
If necessary, replace connecting rods.
2010 BMW Z4 30i
IMPORTANT: Connecting rods are divided into weight classes and are only available as a set.
Old and new connecting rods must not be installed in mixed combinations.
Installation note:
The gudgeon pin must be able to be pressed through the liner by hand with little force and must not display any
significant play.
Fig. 224: Installing Gudgeon Pin

Measuring PISTON INSTALLATION CLEARANCE :
Measure piston diameter with micrometer at measuring point A from bottom edge of piston and offset at 90° to
the axis of the gudgeon pin.
Piston diameter at measuring point A.
Fig. 225: Measuring Piston Diameter

Adjust micrometer to cylinder bore of engine block. Set internal calliper on micrometer to zero. Measure
bottom, center and top of cylinder bore in direction of travel and direction of engine rotation.
Diameter of cylinder bore.
2010 BMW Z4 30i
Piston installation clearance.
TOTAL PERMISSIBLE WEAR TOLERANCE .
Installation note:
If necessary, replace piston.
Fig. 226: Checking Cylinder Bore Diameter

IMPORTANT: The opening of the piston pin circlip must be installed on the piston in the 6
o'clock position.
Risk of damage!
Insert piston circlip (2) into groove of special tool 11 8 562.
Bring piston circlip (2) into working position (1).
2010 BMW Z4 30i
Fig. 227: Inserting Piston Circlip Into Groove Of Special Tool 11 8 562
Slide on special tool 11 8 563 up to piston pin circlip (2)
Special tools 11 8 562 and 11 8 563 are prepared.

Opening on special tool 11 8 562 must point to piston crown; only then can special tool 11 8 563 be fitted
correctly.
If the special tools 11 8 562 and 11 8 563 are not positioned correctly, the piston pin circlip must be driven in
2010 BMW Z4 30i
using a plastic hammer in direction of arrow.
NOTE: See graphic.
Fig. 229: Inserting Piston Pin Circlip

Piston pin circlip is correctly installed when opening (1) points downwards.
Fig. 230: Identifying Piston Pin Circlip Installation Position

NOTE: B 30.
Install all PISTON RINGS .
Install all BEARING SHELLS .
Coat piston and piston rings with oil.
Pre-install piston (2) in special tool 11 8 141.
2010 BMW Z4 30i
Screw on special tool 11 8 590 in connecting rod (2).
Installation note:
Make sure protective lugs (1) on special tool 11 8 590 are positioned correctly and check for damage.

Insert piston with connecting rod in cylinder.
IMPORTANT: Risk of damage to oil spray nozzle.
Risk of breakage of piston rings.
Press in piston in direction of arrow with finger pressure only, do not drive in.
Insert piston so that arrow on piston crown points to camshaft drive.
Press in piston (1) with special tool 11 8 141.
2010 BMW Z4 30i
Fig. 232: Pressing Piston Using Special Tool 11 8 141

IMPORTANT: Connecting rod and connecting rod bearing cap are marked with pairing letters
(1) and must not be mixed up.
Swapping or incorrectly fitting the connecting rod bearing cap on the big end
will result in engine damage .
Fig. 233: Identifying Conrod Bearing Cap With Identification Marks

Apply a light coat of oil to crank pin.
Assemble connecting rod and crankshaft journal.
Screw off special tool 11 8 560 in anticlockwise direction.
Fig. 234: Removing Special Tool In Counterclockwise Direction

Fit bearing caps (2) so that pairing letters match up.

2010 BMW Z4 30i
Install new connecting rod bolts (1).
Fig. 235: Identifying Bearing Caps And Connecting Rod Bolts

Adjust torsion angle of connecting rod with special tool 00 9 120 (see illustration).
Fig. 236: Adjusting Conrod Torsion Angle Using Special Tool 00 9 120
Assemble engine.
11 25 671 REPLACING PISTON RINGS ON ALL PISTONS (N54, N54T)
Remove all PISTONS .
2010 BMW Z4 30i
Measuring axial clearance of piston rings in piston ring groove.
TECHNICAL DATA.
NOTE: It is not possible to measure the axial clearance of the oil scraper rings.
Fig. 237: Checking Piston Ring Clearance

Remove compression ring and stepped ring upwards with piston ring pliers.
Oil scraper ring comprises two steel band rings and a support spring.
NOTE: Oil scraper ring cannot be removed with piston ring pliers.
Put aside piston rings in correct sequence and installation position.
It might not be possible to find the identification on used piston rings.
Installation note:
New pistons may only be installed together with new piston rings.
2010 BMW Z4 30i
Fig. 238: Removing Compression Ring And Stepped Ring

Determine See ENGINE BLOCK, CYLINDER CRANKCASE N54/B30 or PISTONS WITH RINGS AND
PINS N54/B30 with a feeler gauge.
Fig. 239: Determining Piston Ring Gap Using Filler Gauge

NOTE: Schematic diagram of piston rings.
Installation note:
Piston rings with "TOP" identification must point to piston crown.
1. Plain compression ring

2. Piston ring "top"
3. Two-part oil scraper ring
2010 BMW Z4 30i
Fig. 240: Identifying Piston Rings

NOTE: Oil control ring comprises two steel band rings (1) and a support spring (2).
Installation note:
Insert support spring (2) into piston ring groove and then fit steel band rings (1) so that contact points are offset
by approx. 120°.
Fig. 241: Identifying Steel Band Ring And Support Spring

Offset the contact points (1) of the piston rings by approx. 120° to each other but do not position above the
gudgeon pin boss.
NOTE: See graphic N52.
2010 BMW Z4 30i
Fig. 242: Identifying Piston Rings Contact Point

Assemble engine.
V-RIBBED BELT WITH TENSIONER AND DEFLECTION ELEMENT

11 28 010 REPLACING DRIVE BELT FOR ALTERNATOR (N54, N54T)
IMPORTANT: Mark the direction of rotation of the drive belt if it is to be reused.
Depending on the build date (version), the idler pulleys can be fitted with and
without grooves.
Remove FAN COWL
Unfasten hose clip (1).
Release quick-connect fastener (3) 90° on boost pressure hose in direction of arrow.
Pull off air hose (2).
Installation note:
Bring lock (3) back 90° into installation position.
Recirculated air hose must audibly snap into place.
2010 BMW Z4 30i
Fig. 243: Removing Quick-Connect Fastener

Unclip line (1) from holder (2) in direction of arrow.
Fig. 244: Unclipping Line From Holder

Release coolant hose (1) from bracket (2).
2010 BMW Z4 30i
Fig. 245: Identifying Coolant Hose And Holder

Release screw (1).
Fold air duct (2) down.
NOTE: Do not remove air duct (2).
Fig. 246: Folding Air Duct Down

Turn belt tensioner (1) in direction of arrow until bore is flush on housing.
Secure belt tensioner in place with special tool 11 3 340 .
2010 BMW Z4 30i
Fig. 247: Turning Belt Tensioner

Remove drive belt (1).
Installation note:
Mark the direction of rotation of the drive belt if it is to be reused.
Pretension tensioning pulley (1) in direction of arrow.
Remove special tool 11 3 340 .
Fig. 248: Identifying Drive Belt

Installation note:
Note arrangement of drive belt
Arrow shows the direction of rotation.
2010 BMW Z4 30i
Fig. 249: Identifying Drive Belt Rotation Direction

Assemble engine.
Installation note:
Risk of damage!
Check that drive belt is in correct installation position.
11 28 020 REPLACING TENSIONING DEVICE FOR ALTERNATOR DRIVE BELT (N54, N54T)
Remove DRIVE BELT
Remove protective cap on deflection pulley.
Remove special tool 11 3 340 .
Release screw (1) on belt tensioner.
2010 BMW Z4 30i
Fig. 250: Removing Screw On Belt Tensioner

Arrangement and direction of rotation of drive belt.
Fig. 251: Identifying Drive Belt Rotation Direction

Assemble engine.
CAMSHAFT
11 31 505 ADJUSTING CAMSHAFT TIMING (N54, N54T)
To open the central bolt at the camshaft, grip hexagon on rear of camshaft.
2010 BMW Z4 30i
Remove CYLINDER HEAD COVER
Remove fastener (1) in direction of arrow.
Installation note:
Install fastener (1) with bore facing outwards.
Fig. 252: Removing Fastener

Rotate crankshaft at central bolt into TDC position.
Slide in special tool 11 0 300 in direction of arrow and block crankshaft.
IMPORTANT: On engines with automatic transmissions, there is shortly before the special
tool bore for the TDC position a large bore which can be confused with the
special tool bore.
2010 BMW Z4 30i
Fig. 253: Sliding In Special Tool 11 0 300

If the flywheel is secured in the correct bore with special tool 11 0 300 , the engine can no longer be moved at
the central bolt.
Fit special tool 11 4 283 with screws (1).
Fit special tool 11 4 281 on special tool 11 4 283.
IMPORTANT: If special tool 11 4 281 cannot be installed, the camshaft must be rotated at the
hexagon head at the rear.

With cylinder No. 1 in ignition TDC position, cams of exhaust camshaft (2) and intake camshaft (1) at 6th
cylinder point downwards at an angle.
NOTE: If the timing is adjusted while the engine is installed, the position of the
camshaft can only be checked with a mirror.
2010 BMW Z4 30i
Fig. 255: Identifying Inlet And Exhaust Camshaft

Release central bolt (1) of exhaust camshaft.
Installation note:
Replace screw (1).
Release central bolt (2) of inlet camshaft.
Installation note:
Replace screw (2).
Fig. 256: Identifying Central Bolt Of Inlet And Exhaust Camshaft

2010 BMW Z4 30i
Rotate increment wheels until retaining pins on special tool 11 8 520 match up.
Push special tool 11 8 520 onto cylinder head.
Secure special tool 11 8 520 with bolts (1 and 2).
NOTE: Bolts M6 x 45 (1 and 2) with captive washer.
Fig. 257: Identifying Special Tool 11 8 520 With Bolts

REMOVE CHAIN TENSIONER (1).
Screw special tool 11 9 340 into cylinder head.
Pre-tension timing chain with special tool 00 9 250 to 0.6 Nm.
Tighten central bolts (2 and 3) with special tool 00 9 120 .
2010 BMW Z4 30i
Fig. 258: Identifying Chain Tensioner And Central Bolts

Assemble engine.
11 31 005 CHECKING CAMSHAFT TIMING (N54, N54T)

Remove front UNDERBODY PROTECTION
Installation note:
Fig. 259: Identifying Bearing Caps

Rotate crankshaft at central bolt into TDC position.
Slide in special tool 11 0 300 in direction of arrow and block crankshaft.
IMPORTANT: On engines with automatic transmissions, there is shortly before the special
tool bore for the TDC position a large bore which can be confused with the
special tool bore.
2010 BMW Z4 30i
Fig. 260: Sliding In Special Tool 11 0 300

If the flywheel is secured in the correct bore with special tool 11 0 300 , the engine can no longer be moved at
the central bolt.
With 1st cylinder in ignition TDC position, cams of intake camshaft (1) at 6th cylinder point downwards at an
angle.
With 1st cylinder in ignition TDC position, cams of exhaust camshaft (2) at 6th cylinder point downwards at an
angle.
Roller cam follower is not actuated.
NOTE: If the timing is checked while the engine is installed, the position of the
camshaft can only be checked with a mirror.

Secure special tool 11 4 283 on cylinder head with screws (1).
2010 BMW Z4 30i
Mount special tool 11 4 281 on intake and exhaust camshafts.
If the special tools 11 4 281 cannot be attached, the TIMING must be adjusted.

Assemble engine.
11 31 090 INSTALLING AND REMOVING/REPLACING CHAIN TENSIONER PISTON (N54, N54T)
Remove COOLANT EXPANSION TANK (E89 only)
Release chain tensioner (1).
IMPORTANT: Have a cleaning cloth ready. A small quantity of engine oil will emerge after the
screw connection has been released.
Make sure no oil runs onto the belt drive.
2010 BMW Z4 30i
Fig. 263: Identifying Chain Tensioner

Installation note:
No sealing ring is fitted during series-production assembly.
A sealing ring must be fitted by service personnel when the chain tensioner is fitted.
If the chain tensioner is reused, its oil chamber must be drained. Place chain tensioner on a level working
surface and slowly compress.
Repeat procedure twice.
Fig. 264: Compressing Chain Tensioner

Assemble engine.
11 31 028 REMOVING AND INSTALLING/REPLACING EXHAUST CAMSHAFT (N54/N54T)
2010 BMW Z4 30i
It is absolutely essential to follow an exact procedure for removing and

installing the exhaust camshaft.
The upper and lower bearing strips must be preloaded with a total of six
special tools 11 8 553.

Remove EXHAUST ADJUSTING UNIT for exhaust camshaft.
Adjust VALVE TIMING
Release bearing cap screw connections from outside inwards.
Lift out lower and upper bearing strips (1) with camshaft.
Fig. 265: Lifting Lower And Upper Bearing Strips With Camshaft
IMPORTANT: Both camshafts have different markings.
Mixing up the two camshafts will result in engine damage.
A Exhaust camshaft.
E Intake camshaft
2010 BMW Z4 30i
Fig. 266: Identifying Exhaust And Inlet Camshaft

Plain compression rings (1) are engaged at joint.
Press plain compression rings (1) apart upwards and downwards and removed towards front.
IMPORTANT: Plain rectangular compression rings (1) can easily break.
Fig. 267: Pressing Plain Compression Rings

IMPORTANT: Removal on engine:
Engine at cylinder no. 1 firing TDC position.
Removed cylinder head:
When using special tool 11 9 000 , it will be necessary to remove the aluminum
strip.
2010 BMW Z4 30i
Installation note:
Before installing the exhaust camshaft, make sure the roller cam follower is correctly seated on the hydraulic
valve clearance compensating element and the valve.
Fig. 268: Identifying Cam Follower Seat

Installing camshaft bearing strip
Pre-install special tool 11 8 551 on cylinder no. 2.
Observe markings E and A
E: Intake side
A: Exhaust side
Insert special tool 11 8 552 in screw connection of cylinder head cover.
Press down roller cam follower (1) on cylinder no. 2 with spindle nut of special tool 11 8 551.
2010 BMW Z4 30i

Lay lower bearing strip (1) on cylinder head.
Installation note:
Lubricate all bearing points with engine oil.
Fig. 270: Identifying Lower Bearing Strip On Cylinder Head

Insert exhaust camshaft (1) in lower bearing strip.
Installation note:
Lubricate all bearing positions and cams with engine oil.
Fig. 271: Identifying Exhaust Camshaft In Lower Bearing Bank

Installation position (1) of exhaust camshaft (2) at cylinder no. 1.
2010 BMW Z4 30i
Fig. 272: Identifying Installation Position Of Exhaust Camshaft

Join exhaust camshaft to lower and upper bearing strips with torque wrench from inside outwards to 8 Nm.
Release all screws of bearing strip (1) from outside inwards by 90°.
Check position of exhaust camshaft (2) at cylinder no. 6.
Roller cam follower (1) is not actuated.
Fig. 273: Identifying Exhaust Camshaft Position And Cam Follower

Installation note:
Lower and upper bearing strips must be aligned to each other at ground surfaces (1 and 2).
Bring thrust piece and legs of special tools 11 8 553 into contact at milled surfaces.
2010 BMW Z4 30i
Fig. 274: Identifying Bearing Strips

NOTE: Schematic depiction of special tool 11 8 553 at upper bearing strip (1) and lower
bearing strip (2).
IMPORTANT: Tighten screw (3) on thrust piece to 2 Nm.
Fig. 275: Identifying Special Tool 11 8 553 Schematic Depiction On Bearing Strips
Position special tool 11 8 553 over screw connection of bearing strips.
NOTE: Make sure that legs come into exact contact on ground surfaces, lower bearing
strip (1) and upper bearing strip (2).
2010 BMW Z4 30i
Fig. 276: Positioning Special Tool 11 8 553 Over Bearing Banks Screw Connection
Initially tighten screw of special tool 11 8 553 to ground surfaces of lower bearing strip (2) and upper bearing
strip (1).
IMPORTANT: Tighten screws on thrust piece to 2 Nm.
Fig. 277: Tightening Special Tool 11 8 553 Screw

IMPORTANT: Set special tool 11 4 350 to 2 Nm.
Pre-tension all special tools 11 8 553 with special tool 11 4 350 only.
2010 BMW Z4 30i
Fig. 278: Identifying 11 4 350 Torque Wrench

Mount special tools 11 8 553 with screw (1) to inside of cylinder head.
On cylinder no. 2 mount special tool 11 8 553 with screw (1) facing outwards.
Position special tools 11 4 350 so that screw connections (2) of bearing strip are easily accessible.
Fig. 279: Identifying Special Tools 11 8 553 And Special Tool 11 4 350
Tighten lower and upper bearing strips with special tool 00 9 120 .
IMPORTANT: Remove special tool 11 8 553 only when camshaft screw connection is
completed .
2010 BMW Z4 30i
Fig. 280: Tightening Bearing Strips Using Special Tool 00 9 120

Assemble engine.
11 31 025 REMOVING AND INSTALLING/REPLACING INTAKE CAMSHAFT (N54/N54T)
It is absolutely essential to follow an exact procedure for removing and

installing the exhaust camshaft.
The upper and lower bearing strips must be pre-tensioned with a total of six
special tools 11 8 553.
Special tool 11 8 550 can be used for intake and exhaust sides.
Remove INTAKE ADJUSTER of intake camshaft
Release bearing cap screw connections from outside inwards.
Lift out lower and upper bearing strips (1) with camshaft.
2010 BMW Z4 30i
Fig. 281: Lifting Lower And Upper Bearing Strips With Camshaft
Remove upper bearing shell.
Remove intake camshaft (1) marked with (E).
Fig. 282: Identifying Marked Inlet Camshaft

IMPORTANT: Both camshafts have different markings.
Mixing up the two camshafts will result in engine damage.
A Exhaust camshaft
E Intake camshaft
2010 BMW Z4 30i
Fig. 283: Identifying Exhaust And Inlet Camshaft

IMPORTANT: Plain rectangular compression rings (1) can easily break.
Plain rectangular compression rings (1) are engaged at joint.
Press plain compression rings (1) apart upwards and downwards and removed towards front.

IMPORTANT: Removal on engine:
Engine at cylinder no. 1 firing TDC position.
Removed cylinder head:
2010 BMW Z4 30i
When using special tool 11 9 000 , it will be necessary to remove the aluminum
strip.
Installing camshaft bearing strip
Pre-install special tool 11 8 551 on cylinder nos. 2 and 3.
Insert special tool 11 8 552 in screw connection of cylinder head cover.
Special tool 11 8 551 is marked with letters E and A.
E= Intake side
A= Exhaust side
Press down roller cam follower on cylinder no. 3 with spindle nut (2) of special tool 11 8 551.

Installation note:
Before installing intake camshaft, make sure roller cam follower is correctly seated on hydraulic valve clearance
compensating element and valve.
2010 BMW Z4 30i

Installation note:
Pre-install bearing strip of intake camshaft.
Lubricate all bearing points in lower bearing strip with engine oil.
Installation note:
Lay intake camshaft (1) in bearing strip.
Fig. 287: Identifying Marked Inlet Camshaft

Rotate intake camshaft (1) at cylinder no. 1 into position (2).
2010 BMW Z4 30i
Fig. 288: Identifying Inlet Camshaft With Position

Installation note:
Lower and upper bearing strips must be aligned to each other at ground surfaces (1 and 2).
Bring thrust piece and legs of special tools 11 8 553 into contact at milled surfaces.
Fig. 289: Identifying Bearing Strips

NOTE: Schematic depiction of special tool 11 8 553 at lower bearing strip (1) and upper
bearing strip (2).
IMPORTANT: Tighten screw (3) on thrust piece to 2 Nm.
2010 BMW Z4 30i
Fig. 290: Identifying Special Tool 11 8 553 Schematic Depiction On Bearing Strips
Make sure that legs come into exact contact on ground surfaces, lower bearing strip (1) and upper bearing strip
(2).
Fig. 291: Positioning Special Tool 11 8 553 Over Bearing Strips Screw Connection
Initially tighten screw of special tool 11 8 553 to ground surfaces of lower bearing strip (1) and upper bearing
strip (2).
IMPORTANT: Tighten screws on thrust piece to 2 Nm.
2010 BMW Z4 30i
Fig. 292: Tightening Screw Of Special Tool 11 8 553

IMPORTANT: Set special tool 11 4 350 to 2 Nm.
Pre-tension all special tools 11 8 553 with special tool 11 4 350 only.
Fig. 293: Identifying 11 4 350 Torque Wrench

Install upper and lower bearing strips (1).
Pre-install all special tools 11 8 553.
IMPORTANT: Secure special tool 11 8 553 to max. 2 Nm.
2010 BMW Z4 30i
Fig. 294: Identifying Upper And Lower Bearing Strips With Special Tools 11 8 553
Install intake camshaft with bearing strips (1) on cylinder head.
Fig. 295: Identifying Bearing Strips On Cylinder Head

Check position of intake camshaft (1) at cylinder no. 6.
Roller cam follower (2) is not actuated.
2010 BMW Z4 30i
Fig. 296: Identifying Intake Camshaft And Roller Cam Follower

Tighten lower and upper bearing strips with special tool 00 9 120 .
IMPORTANT: Remove special tool 11 8 553 only when camshaft screw connection is
completed.
Fig. 297: Tightening Lower And Upper Bearing Strips Using Special Tool 00 9 120
Adjust VALVE TIMING .
Assemble engine.
11 31 051 REPLACING TIMING CHAIN (N54, N54T)
2010 BMW Z4 30i
Remove FAN COWL

Remove all spark plugs
Remove CHAIN TENSIONER.
Remove CRANKSHAFT SEAL at front
Remove BELT TENSIONER
Remove INTAKE AND EXHAUST ADJUSTERS
Installation note:
Fig. 298: Installing Fastener

Secure engine in TDC firing position of cylinder no. 1 with special tool 11 0 300 .
2010 BMW Z4 30i
Fig. 299: Securing Crankshaft

Mark flywheel and transmission housing with a line (1).
NOTE: Graphic shows automatic transmission.
Fig. 300: Identifying Line On Flywheel And Transmission Housing

Do not remove special tool 11 4 280 .

Procedure, transmission removed
Secure flywheel (crankshaft) with special tool 11 9 260 .
2010 BMW Z4 30i
Fig. 302: Securing Flywheel (Crankshaft) Using Special Tool 11 9 260

Block flywheel (crankshaft) with special tool 11 8 660 on gearbox.
Fig. 303: Securing Flywheel (Crankshaft) Using Special Tool 11 8 660

Secure flywheel in direction of arrow.
2010 BMW Z4 30i
Fig. 304: Securing Flywheel

IMPORTANT: To release central bolt (1), remove special tool 11 0 300 .
Release central bolt with a 3/4" socket (1) and if necessary with a 3/4" extension (2).
Remove central bolt with hub towards front.
Fig. 305: Removing Central Bolt Using Socket

Open plug (1).
2010 BMW Z4 30i
Fig. 306: Identifying Plug

Open plug (1).
Fig. 307: Identifying Plug

Release screw (1) on chain drive at top.
2010 BMW Z4 30i
Fig. 308: Identifying Screw On Chain Drive At Top

Release screw (1) on chain drive at bottom.
Fig. 309: Identifying Screw On Chain Drive At Bottom

Release screws (1).
Remove timing chain module with timing chain and sprocket upwards in direction of arrow.
2010 BMW Z4 30i

IMPORTANT: Note installation direction of sprocket (2).
Collar (see arrow) on sprocket (2) points to crankshaft.
Incorrect assembly will result in engine damage.
Fig. 311: Identifying Sprocket Wheel

Pull timing chain (1) upwards until sprocket (2) engages chain guide (3).
Install timing chain (1) and sprocket (2) in this position.
Installation note:
Always hold timing chain under tension.
Timing chain (1) may jam on chain module (3).
2010 BMW Z4 30i
Fig. 312: Identifying Timing Chain And Chain Module

IMPORTANT: The N54 engine requires special friction plates between the friction surfaces.
The engine will incur damage if the friction plates are damaged or are not fitted.
Friction plates (1 and 2) are clipped into place on sprocket wheel/oil pump module.
Fig. 313: Identifying Friction Plates

Make sure friction plate (3) is in correct installation position.
2010 BMW Z4 30i
Fig. 314: Identifying Friction Plate Installation Position

Push on friction plate (1) without retainers.
Fig. 315: Identifying Friction Plate Without Retainers

Insert chain module from above and secure with bolt (1).
Make sure gear wheels (2) are in correct installation position.
Insert hub (3) with friction plate.
2010 BMW Z4 30i
Fig. 316: Identifying Gear Wheels Installation Position

Secure special tool 00 9 140 with magnet to engine support (1).
Fig. 317: Securing Special Tool 00 9 140 With Magnet To Engine Carrier
Secure central bolt with special tool 00 9 140 .
2010 BMW Z4 30i
Fig. 318: Securing Central Bolt Using Special Tool 00 9 140

Remove CRANKSHAFT SEAL at front
Install INTAKE AND EXHAUST ADJUSTERS.
Install CHAIN TENSIONER.
Crank engine twice.
Check TIMING.
Assemble engine.
ROCKER ARM WITH BEARING MOUNT

11 33 050 REMOVING AND INSTALLING OR REPLACING ALL ROCKER ARMS (N54, N54T)
IMPORTANT: Rocker arms (1) are divided into bearing categories.
The tolerance classes are identified in numbers from 1 to 6.
Already used rocker arms (1) may only be reused in the same position.
Classification is not required on the N54 engine. All numbers from 1 to 6 can be
optionally installed as a replacement.

Remove INTAKE CAMSHAFT
Remove EXHAUST CAMSHAFT.
Detach roller cam followers (1) from hydraulic valve clearance compensating element and remove.
Set down roller cam followers in tidy and orderly fashion; if necessary, set down in special tool 11 4 480 .
Installation note:
Before installing exhaust and inlet camshafts, make sure roller cam followers are correctly seated.
2010 BMW Z4 30i

Remove hydraulic valve clearance compensating element in direction of arrow.
Installation note:
If the hydraulic valve clearance compensating elements are reused, they must be placed together with the roller
cam followers in neat order if necessary in special tool 11 4 480 .
Fig. 320: Removing HVCA Element

Assemble engine.
VALVES WITH SPRINGS

11 34 552 REMOVING AND INSTALLING OR REPLACING ALL VALVES (N54, N54T)
2010 BMW Z4 30i
Remove INTAKE CAMSHAFT.

Remove ROLLER CAM FOLLOWER.
Remove VALVE SPRINGS.
Remove VALVE STEM SEALS.
Arrangement:
1. Valve
2. Valve stem seal with spring plate, bottom
3. Valve spring
4. Top plate spring
5. Valve keys
If the valves are to be reused, set them down in special tool 11 4 480 in a tidy and orderly fashion.
Fig. 321: Exploded View Of Valve Assembly

Assemble engine.
Check function of DME.
11 34 715 REPLACING ALL VALVE SPRINGS (N54, N54T)
IMPORTANT: Different valve stem diameters.
Mixing up the valve springs will result in damage to the engine.
Remove cylinder head cover

2010 BMW Z4 30i

Remove INTAKE CAMSHAFT
Remove ROLLER CAM FOLLOWERS
Intake valves
Fit cylinder head on special tool 11 9 000 .
Press valve spring down on spring cup with special tools 11 0 009 and 11 9 017.
Fig. 322: Pressing Valve Spring Down On Spring Retainer Using Special Tools 11 0 009 And 11 9 017
Exhaust valves
Fit cylinder head on special tool 11 9 000 .
Press valve spring down on spring cup with special tools 11 0 009 and 11 0 346.
Fig. 323: Pressing Valve Spring Down On Spring Retainer Using Special Tools 11 0 009 And 11 0 346
2010 BMW Z4 30i
Remove valve tapers with a magnet.
Remove valve spring and spring retainer.
Set down on special tool 11 4 480 in a tidy and orderly fashion.
Fig. 324: Removing Valve Spring And Spring Retainer

IMPORTANT: Incorrect installation possible.
Incorrect installation will result in valve spring breakage!
Color marking (1) is normally on lower end of valve spring.
Installation note:
Inlet valve: Violet/green or violet/yellow
Exhaust: White/green or white/yellow
If the colors on the valve springs can no longer be identified, these must be replaced for safety reasons.
2010 BMW Z4 30i
Fig. 325: Dimensions Of Valve Spring

Arrangement:
1. Valve
2. Valve stem seal with spring plate, bottom
3. Valve spring
4. Top plate spring
5. Valve keys
Fig. 326: Exploded View Of Valve Assembly

Assemble engine.
Check function of DME control unit.
11 34 560 REPLACING ALL VALVE STEM SEALS (N54, N54T)
2010 BMW Z4 30i

Remove INTAKE CAMSHAFT.
Remove ROLLER CAM FOLLOWER.
Remove all VALVE SPRINGS.
Firmly press special tool 11 1 480 onto old valve stem seals.
Detach valve stem seal from valve stem by turning and simultaneously pulling special tool 11 1 480 .
Installation note:
Insert all VALVES.

NOTE: For use on the N54 engine, special tool 11 6 380 must be remachined according
to the sketch with a 10 mm drill bit dia. to a depth of B = approx. 23 mm.
This modification has already been taken into account for reordering.
2010 BMW Z4 30i

IMPORTANT: Different diameters at valve stem.
All valve stem seals are colour-coded.
Valve dia. 5 mm: valve stem seal is red or brown.
Valve dia. 6 mm: valve stem seal is green or light green.
Fig. 329: Identifying Valve Stem Seal

Installation note:
Fit the mounting sleeves (plastic sleeves) supplied in the spare part on the valve stem end
Lubricate mounting sleeve.
Press on valve stem seal with special tool 11 6 380 by hand up to stop.
2010 BMW Z4 30i
Fig. 330: Pressing Valve Stem Seal Using Special Tool 11 6 380
Assemble engine.
VARIABLE CAMSHAFT TIMING

11 36 655 REMOVING AND INSTALLING/REPLACING BOTH SOLENOID VALVES (N54, N54T)
IMPORTANT: Always check that the solenoid valves are clean during removal and
installation.
Possible malfunctions if valves are contaminated:
Rough running
OBD incorrect entry
Poor exhaust gas values
Low engine power
Do not clean solenoid valves with compressed air.
Read out fault memory in DME control unit

Switch off ignition
2010 BMW Z4 30i
Remove FAN COWL
NOTE: Carefully press coolant hose and pressure line (not shown) to one side.
NOTE: Solenoid valve (2) controls the intake adjuster.
Solenoid valve (3) controls the exhaust adjuster.
Disconnect plug connections (1 and 4).
Installation note:
Do not mix up plug connections (1 and 4) of solenoid valves.
Fig. 331: Identifying Solenoid Valve Plug Connections

Plug connections (1 and 4) must snap audibly into place!
Unfasten screws (3 and 4).
Carefully pull out solenoid valves (1 and 2).
2010 BMW Z4 30i
Fig. 332: Identifying Solenoid Valves

Installation note:
Replace sealing ring (1) on solenoid valve (2).
NOTE: Moisten sealing ring (1) with engine oil.
Avoid damaging, e.g. notches or scratches, the solenoid valve (2).
Fig. 333: Identifying Sealing Ring On Solenoid Valve

Do not tilt solenoid valves (1 and 2) when inserting into cylinder head.
Carefully insert solenoid valves (1 and 2) up to stop.
2010 BMW Z4 30i
Ensure correct installation position.
Insert screws (3 and 4) and tighten down.
Fig. 334: Identifying Solenoid Valves

Assemble engine.
Delete fault memory.
11 36 046 REMOVING AND INSTALLING/REPLACING INTAKE AND EXHAUST CAMSHAFT

ADJUSTERS (N54, N54T)
IMPORTANT: To open central bolts, release at intake and exhaust adjusters with special tool
11 4 280 only.
Remove cylinder head cover
2010 BMW Z4 30i
Fig. 335: Identifying Camshafts

Slide in special tool 11 0 300 in direction of arrow.
Rotate flywheel (1) at central bolt until firing TDC position at cylinder no. 1 is reached.
IMPORTANT: The TDC bore can be mixed up in automatic transmissions.
Fig. 336: Sliding Special Tool 11 0 300

With cylinder No. 1 in ignition TDC position, intake camshaft (1) at 6th cylinder points downwards at an angle
to the left.
With cylinder No. 1 in ignition TDC position, exhaust camshaft (2) at 6th cylinder points downwards at an
angle to the right.
2010 BMW Z4 30i
Installation note:
If the timing is checked while the engine is installed, this is only possible with a mirror.

Fit special tool 11 4 281 on special tool 11 4 283.

Release central bolt of exhaust camshaft adjuster (1).
Release central bolt of intake camshaft adjuster (2).
Release CHAIN TENSIONER .
2010 BMW Z4 30i
Fig. 339: Identifying Inlet And Exhaust Camshaft Central Bolt

Detach exhaust camshaft adjuster (1) from exhaust camshaft.
Detach intake camshaft adjuster (2) from intake camshaft.
Installation note:
To facilitate removal and installation of the intake and exhaust adjusters, turn the increment wheels at the
aperture downwards.
Fig. 340: Identifying Inlet/Exhaust Adjustment Unit

IMPORTANT: Risk of mixing up the intake and exhaust adjusters.

Mixing up the intake and exhaust adjusters will cause damage to the
engine.
The intake and exhaust camshaft adjusters are different.
2010 BMW Z4 30i
The variable camshaft timing control is marked with AUS and EX for the exhaust camshaft.
The variable camshaft timing control is marked with EIN and IN for the intake camshaft.
The increment wheels can be fitted alternatively.
Fig. 341: Identifying AUS And EX Marks For Exhaust Camshaft

Position intake and exhaust adjusters on camshafts.
Installation position of intake and exhaust adjusters can be freely selected.
Installation note:
Replace screws (1 and 2).
Insert screws (1 and 2).
Adjust VALVE TIMING .
Fit CHAIN TENSIONER .
2010 BMW Z4 30i
Fig. 342: Identifying Inlet And Exhaust Camshaft Central Bolt

IMPORTANT: Incorrect installation possible.
Make sure that timing chain is guided in tensioning rail (1).
NOTE: Schematic representation on removed chain drive.
Fig. 343: Locating Tensioning Rail

Assemble engine.
OIL SUPPLY
11 40 000 CHECKING ENGINE OIL PRESSURE (N54, N54T)
2010 BMW Z4 30i
Remove front IGNITION COIL COVER
Disconnect plug connection (1) on oil pressure switch.
Installation note:
Plug connection (1) must snap audibly into place!
Remove oil pressure switch (2).
Fig. 344: Identifying Oil Pressure Sensor And Plug

Screw in special tool 11 4 050 with sealing ring (1).
Fig. 345: Identifying Special Tool (11 4 050) And Sealing Ring
Checking engine oil pressure with BMW diagnosis system
2010 BMW Z4 30i
Connect special tools 13 6 054 and 13 6 051.
Checking engine oil pressure with pressure gauge
Connect special tools 13 3 063 and 13 3 061.
Start engine and check engine oil pressure.
Compare actual values with prescribed SETPOINT VALUES .
Fig. 346: Checking Engine Oil Pressure Using BMW Diagnosis System
Assemble engine.
OIL PUMP WITH FILTER AND DRIVE

11 41 000 REMOVING AND INSTALLING OIL PUMP (N54, N54T)
Remove OIL SUMP
Release screws (1).
Installation note:
Replace aluminum screws
Remove intake pipe (2) in direction of arrow.
2010 BMW Z4 30i
Fig. 347: Removing Intake Pipe

Secure oil pump drive gear with special tool 11 0 300 to oil pump.
IMPORTANT: Release central bolt (2) only with special tool 11 0 300 .
Fig. 348: Securing Oil Pump Drive Gear Using Special Tool 11 0 300
2010 BMW Z4 30i
Fig. 349: Identifying Bolt And Screws

Release screws (1).
Installation note:
Replace aluminum screws

Pull of drive gear (1) in direction of arrow.
NOTE: The chain tensioner pushes the timing chain (3) of the triangular drive upward.
Do not remove drive gear.
Remove oil pump (2) in direction of arrow.
2010 BMW Z4 30i
Fig. 351: Pulling Drive Gear

Installation note:
Check spacer bushes (1) for damage and firm seating.
Replace spacer bushes (1) if necessary
Align mounting flats (3) on oil pump (2) to drive gear.
Install oil pump (2).
Fig. 352: Identifying Spacer Bushings And Oil Pump

Assemble engine.
11 66 000 REMOVING AND INSTALLING OR REPLACING VACUUM/OIL PUMP (N47 D20 O1)
IMPORTANT: It is possible to remove and install the vacuum oil pump without removing the
transmission.
2010 BMW Z4 30i
Removing oil sump.
Release screws (1).
Remove intake snorkel in direction of arrow.
Fig. 353: Removing Intake Snorkel

Release screw (1).

Release screws (1).
2010 BMW Z4 30i
Installation note:
Clean and blow out thread

Release screws (1).
When installed, the oil pump chain must be fed out from the sprocket wheel of the oil pump drive gear; the
sprocket wheel cannot be removed.
NOTE: Illustration shows gear case cover removed.
Fig. 356: Identifying Gear Case Cover Screw

2010 BMW Z4 30i
Oil vacuum pump must be fed out at chain drive (1).
Fig. 357: Identifying Chain Drive

Feed out oil vacuum pump (1) in direction of arrow and remove.
Installation in reverse sequence.
Installation note:
Fig. 358: Identifying Oil Vacuum Pump

Install all screws (1) and tighten down.
2010 BMW Z4 30i

Install and tighten down screws (1).

Installation note:
Insert and secure screw (1).
Secure screw (1) with special tool 00 9 120 .
2010 BMW Z4 30i

Assemble engine.
11 41 010 REMOVING AND INSTALLING/REPLACING CHAIN MODULE FOR OIL

PUMP/VACUUM PUMP (N54, N54T)
damage).

Remove OIL SUMP
Remove DRIVE BELT
Remove drive belt TENSIONER
Remove vacuum pump SEALING CAP
Remove CHAIN TENSIONER.
2010 BMW Z4 30i
Turn sprocket (3) at central bolt (crankshaft) into position.
Screw special tool 11 8 650 into crankcase.
Position special tool 11 0 290 on sprocket
and on special tool 11 8 650 .
Release screw (1).
Fig. 362: Positioning Special Tool 11 0 290 On Sprocket Wheel And On Special Tool 11 8 650
Press timing chain with chain tensioner (1) in direction of arrow.
Secure chain module with special tool 11 4 120 in hole (2).
Feed out sprocket (3) at hexagon head (4) of vacuum pump.
Installation note:
A lock pin is pre-installed if the triangular drive is replaced.
2010 BMW Z4 30i
Fig. 363: Pressing Timing Chain Using Chain Tensioner

Fig. 364: Identifying Bolt And Screws

NOTE: Sprocket must be blocked in order to release central bolt (2).
Insert pin (1) with 6 mm dia. between sprocket and housing of oil pump.
Release oil pump central bolt (2).
2010 BMW Z4 30i
Fig. 365: Identifying Central Bolt And Pin

Secure CRANKSHAFT AND CAMSHAFT .
Do not remove special tools 11 0 300 and 11 4 280 .
Fit special tool 11 9 280.
Release central screw (1).
NOTE: A 3/4 inch tool is needed to release the central bolt.
A second person is required.
Fig. 366: Identifying Central Bolt With Special Tool (11 9 280)
2010 BMW Z4 30i
Remove hub (2) towards front.
Installation note:
Replace front CRANKSHAFT SEAL.
Fig. 367: Identifying Front Hub

Open screw plug on bedplate.
Installation note:
Replace seal.
Release screw (1) with special tool 11 8 640 on triangular drive.
Installation note:
2010 BMW Z4 30i

Remove triangular drive (1) in direction of arrow.
Fig. 369: Removing Chain Module

IMPORTANT: Note installation direction of sprocket (2).
Collar on sprocket (2) points to timing chain drive.
Incorrect assembly will result in engine damage.
2010 BMW Z4 30i
Fig. 370: Identifying Sprocket Wheel

Friction plates (1 and 2) must be clipped into place on the oil pump module sprocket.
The third friction plate is attached to the crankshaft hub.
Fig. 371: Identifying Friction Plates

Feed in oil pump chain module.
Secure oil pump chain module with screws (2).
2010 BMW Z4 30i
Installation note:
Check both friction plates (3) with retainers for correct installation position.
Fig. 372: Identifying Friction Plate Installation Position

Push on friction plate (1) without retainers.
Fig. 373: Identifying Friction Plate Without Retainers

Fit central bolt (1).
2010 BMW Z4 30i
Fig. 374: Identifying Central Bolt

Insert special tools 11 8 650 and 11 0 290 .
Tighten bolt (1).
Install special tool 11 0 300 .
Tighten bolt (2).
2010 BMW Z4 30i
Fig. 376: Securing Oil Pump Drive Gear Using Special Tool 11 0 300
Tighten down special tool 11 5 200 with screws (1) to hub.
Do not remove special tools 11 0 300 and 11 4 280 .
Fig. 377: Identifying Screws With Special Tool (11 5 200)

Tighten central bolt to jointing torque.
Mark torsion angle tightening on tool with stroke of paint (1).
See graphic.
IMPORTANT: Do not remove tool from central bolt during torsion angle tightening. Risk of
damage!
2010 BMW Z4 30i
Fig. 378: Identifying Colored Line

Installation note:
Replace front CRANKSHAFT SEAL.
Assemble engine.
OIL FILTER AND LINES

11 42 198 REMOVING AND INSTALLING OIL FEED LINE FOR EXHAUST TURBOCHARGER
(N54)
Remove exhaust turbocharger.
Release screw (2). Tightening torque 11 42 9AZ.
Important! Where necessary, to release the oil feed line (3), do not place pliers on the pipe. Risk of damage!
Fig. 379: Identifying Turbocharger

2010 BMW Z4 30i
If necessary, release oil feed line (3) with suitable pliers at connection and remove.
Installation note: Replace O-rings.
Assemble engine.
11 42 250 REMOVING AND INSTALLING OIL RETURN LINE FOR EXHAUST TURBOCHARGER
(N54)
Remove both catalytic converters.
Remove right engine support arm.
Undo screws (1 and 2)
Fig. 380: Removing Oil Return Pipe

Tightening torque 11 42 7AZ. .
Remove oil return line in direction of arrow.
Installation note: Renew O-rings and gaskets.
Assemble engine.
11 42 248 REMOVING AND INSTALLING/RENEWING THE OIL RETURN LINE FOR EXHAUST
TURBOCHARGER CYL. 1-3 (N54)
IMPORTANT: It is not necessary to carry out a chassis/wheel alignment check to release the
steering tie rod.
2010 BMW Z4 30i
Partially release the track rod end on the right.

Partially release the holder on the steering gear.
Disconnect the plug connection at the coolant pump.
Remove heat shield.
Remove coolant hose from coolant pump.
Release screws (1 and 2).
Fig. 381: Locating Oil Return Pipe Screw

Remove oil return line in direction of arrow.
Installation note: Renew O-rings and gaskets.
Assemble engine.
11 42 020 REMOVING AND INSTALLING/REPLACING FULL-FLOW OIL FILTER (N54, N54T)
WARNING: Danger of scalding!
Only perform these tasks on an engine that has cooled down.
When working on the engine oil, coolant or fuel circuit, it is essential always to
protect the alternator and belt drive against contamination.
Cover alternator with suitable materials.
2010 BMW Z4 30i
Remove INTAKE PLENUM

Drain COOLANT
Unlock coolant hose and detach
Remove OIL-TO-WATER HEAT EXCHANGER
Release oil filter cover with special tool 11 9 240 . Tightening torque 11 42 1AZ .
NOTE: Engine oil flows out of the oil filter housing and back into the oil sump.
Installation note:
Replace sealing rings on oil filter cover.
Moisten sealing rings with engine oil.
Fig. 382: Releasing Oil Filter Cap Using Special Tool 11 9 240
Release screws (1).
Release screw (2).
NOTE: Have cleaning cloth ready to catch residual oil.
Installation note:
Replace all seals.
2010 BMW Z4 30i
If necessary, replace filter element.
Modify oil pressure switch when replacing.

Assemble engine.
11 42 035 REMOVING AND INSTALLING/REPLACING THERMOSTAT HOUSING (N54, N54T)
WARNING: Warning! Risk of scalding! Only perform this repair work on an engine
that has cooled down.
IMPORTANT: Important! You must protect the alternator against contamination before
carrying out any work on the oil or cooling circuit. A residual amount of coolant
emerges when the hoses are detached. A residual amount of oil emerges when
the oil-coolant heat exchanger is released. Have a cleaning cloth ready. Cover
alternator with suitable auxiliary materials.
Drain COOLANT t.
Remove FAN COWL .
Release screw (1). Tightening torque 11 42 3AZ . Pull engine oil pipe down off the thermostat housing.
Installation note: Replace O-rings.
2010 BMW Z4 30i

Release screws (1) on thermostat housing. Remove oil-coolant heat exchanger towards front. Picture shows E9x
Installation note: Replace gasket.
Fig. 385: Identifying Bolts On Oil-Coolant Heat Exchanger

Reassemble vehicle and set in horizontal position. Vent COOLING SYSTEM and check for water leaks. Start
engine and run at idle until oil pressure warning lamp goes out. Turn off engine. Wait approx. 5 minutes and
check oil level. Top up engine oil if necessary.
OIL COOLER
11 44 000 REMOVING AND INSTALLING/REPLACING OIL-TO-WATER HEAT EXCHANGER
(N54, N54T)
2010 BMW Z4 30i
IMPORTANT: You must protect the alternator against contamination before carrying out any
work on the oil or cooling circuit.
A residual amount of coolant emerges when the hoses are detached. A residual
amount of oil emerges when the oil-coolant heat exchanger is released. Have a
cleaning cloth ready.
Cover alternator with suitable apparatus.
Drain COOLANT
Remove FAN COWL
Release screw (1).
Do not detach engine oil pipe from oil-to-water heat exchanger in downward direction.
Installation note:
Replace O-rings.

Release bolts (1) on oil-coolant heat exchanger.
Remove oil-coolant heat exchanger towards front.
2010 BMW Z4 30i
Picture shows E9x
Installation note:
Replace seal.
Fig. 387: Identifying Oil-Coolant Heat Exchanger Bolt

Reassemble car and set in horizontal position.
Vent COOLING SYSTEM and check for water leaks.
Start engine and run at idle until oil pressure warning lamp goes out.
Turn off engine.
Wait approx. 5 minutes and check oil level.
Top up engine oil if necessary.
WATER PUMP WITH DRIVE

11 51 000 REMOVING AND INSTALLING/RENEWING COOLANT PUMP (N54, N54T)
Only perform this work after engine has cooled down.
Recycling
Catch and dispose of drained coolant in a suitable container.
2010 BMW Z4 30i
damage).
Remove COOLANT THERMOSTAT

Remove RIGHT DIAGONAL STRUT
Release coolant hose (1).
Release coolant hose (3).
Disconnect plug connection (2).
Release screws (5).
Installation note:
Installation note:
If a coolant pump is reused, it must be mechanically rotated once (breakaway torque at pump gears).
2010 BMW Z4 30i
Fig. 388: Identifying Coolant Hose With Plug Connection And Mounting Screws
One coolant pump rotation will be sufficient.
Assemble engine.
VENTING INSTRUCTIONS must be observed without fail.
THERMOSTAT AND CONNECTIONS

11 53 000 REMOVING AND INSTALLING/REPLACING COOLANT THERMOSTAT (N54, N54T)
Danger of injury!
Risk of skidding due to coolant on the floor.
Recycling
Catch and dispose of drained coolant in a suitable collecting vessel.
IMPORTANT: Read and comply with GENERAL NOTES .
Protect plug connections against coolant and dirt contamination.
2010 BMW Z4 30i
Cover plug connections with suitable materials.
Remove FAN COWL .

Release FRONT STABILIZER on front axle.
Release screws (1) (only on front axle support)
Fig. 389: Identifying Screws On Front Axle Support

NOTE: Illustration shows coolant thermostat removed.
Disconnect coolant hoses (arrows) on the thermostat (1) with clamping tongs.
2010 BMW Z4 30i
Fig. 390: Locating Coolant Hoses On Thermostat

Release hose clamp (1) and detach coolant hose.
Release hose clamp (2) and detach coolant hose.
Unlock and detach coolant hose (3).
Release screws (6).
2010 BMW Z4 30i
Fig. 391: Identifying Hose, Hose Clamp And Plug Connection

Assemble engine.
Fill the COOLING SYSTEM .
Check function of cooling system.
11 53 740 REMOVING AND INSTALLING/REPLACING FEED LINE (N54, N54T)
Only perform this work after engine has cooled down.
Recycling
Catch and dispose of drained coolant in a suitable container.
Drain COOLANT
Remove both catalytic exhaust-gas converters. See 1832050 REMOVING AND
INSTALLING/REPLACING CATALYTIC EXHAUST-GAS CONVERTER FOR CYLINDERS 1-
3 (N54) or 1832060 REMOVING AND INSTALLING/REPLACING CATALYTIC EXHAUST-
GAS CONVERTER FOR CYLINDERS 4-6 (N54) .
Unfasten hose clip (1).
2010 BMW Z4 30i
Detach coolant hose of feed line in direction of arrow from coolant pump (2).
Fig. 392: Disconnecting Coolant Hose From Feed Line

Where necessary, to release the coolant feed lines (3 and 4), do not place pliers
on the pipes.
If necessary, release coolant feed lines (3 and 4) with suitable pliers at connection.
Installation note:
Replace O-rings.
2010 BMW Z4 30i
Fig. 393: Identifying Coolant Feed Lines And Screws

NOTE: For purposes of clarity, the graphic shows the released coolant feed lines
removed.
Release screws (1).
Remove feed line (2).
Installation note:
Replace seal.
Fig. 394: Identifying Feed Line With Mounting Screws

Assemble engine.
2010 BMW Z4 30i
Top up COOLANT .
BLEEDING INSTRUCTIONS must be observed without fail.
INTAKE MANIFOLD
11 61 365 REMOVING AND INSTALLING/REPLACING LEFT CHARGE AIR DUCT (N54, N54T)
Remove FAN COWL

Remove INTAKE SILENCER HOUSING
IMPORTANT: Coat sealing rings of snap fasteners with lubricant.
Pressure pipes with quick-connect couplings cannot be fitted without antiseize

agent.
Unlock quick-connect coupling.
Detach charge air duct (1) from charge air cooler (2).
Installation note:
Coat sealing rings of snap fasteners with lubricant.

Pressure pipes must audibly snap into place.
Fig. 395: Identifying Charge-Air Duct And Aircooler

Release quick-connect couplings (1) by turning lock through 90°.
2010 BMW Z4 30i
Detach recirculated-air hoses (2) and lay to one side.
Unlock quick-connect coupling (5) and detach charge air duct (6) from throttle valve actuator.
Pull charge air duct (6) out of rubber grommet (4) and remove towards top.
Fig. 396: Identifying Charge Air Duct, Air Hoses, Plug Connection And Grommet
Installation note:
Bring lock (1) back 90° into installation position.
Pay attention to markings.
Recirculated-air hoses must snap audibly into place.
2010 BMW Z4 30i
Fig. 397: Identifying Lock

IMPORTANT: Risk of damage! to sealing rings.
Special tool 11 8 670 is mandatory.
Attach charge air duct (1) with special tool 11 8 670 to charge air cooler (2).
Installation note:
Texts refer to and illustrations show the right side.
The procedure is identical for the left side.
Fig. 398: Identifying Charge-Air Duct With Special Tool 11 8 670 To Intercooler
IMPORTANT: Charge air hoses with clamp fastenings must be installed dry and free from
grease!
2010 BMW Z4 30i
If charge air hoses with clamp fastenings are not installed dry and free from
grease, this may result in turbocharger failure!
11 61 362 REMOVING AND INSTALLING/REPLACING RIGHT CHARGE AIR DUCT (N54, N54T)
Remove COOLANT EXPANSION TANK

Remove UNDERBODY PROTECTION
Remove right TENSION STRUT
IMPORTANT: Coat sealing rings of snap fasteners with lubricant.
Pressure pipes cannot be fitted without lubricant.
Mark vacuum hoses (1) and detach.
Mark vacuum hose (2) and detach.
Unscrew nuts (3).
Release screw (4).
Tightening torque, screw 11 65 6AZ .
Raise bracket slightly.
Mark vacuum hose (5) on underside of pressure accumulator.
Remove vacuum accumulator with bracket.
2010 BMW Z4 30i
Fig. 399: Identifying Vacuum Hoses And Screws

Release nuts (1) and screws (2), remove heat shield (3).
Fig. 400: Identifying Heat Shield With Mounting Nuts And Screws
Release clamps (1, 2), detach charge air duct (3).
2010 BMW Z4 30i
Fig. 401: Identifying Charge Air Duct With Clamps

Installation note:
Faulty O-rings must be replaced.
Prior to fitting, coat O-ring with suitable antiseize agent.
Fig. 402: Locating O-Rings

Unlock quick-connect coupling.
Detach charge air duct (2) from charge air cooler (3) and remove towards top.
2010 BMW Z4 30i
Fig. 403: Locating Coolant Hose And Charge-Air Duct From Intercooler
IMPORTANT: Risk of damage! to sealing rings!
Special tool 11 8 670 is mandatory.
Attach charge air duct (1) with special tool 11 8 670 to charge air cooler.
Installation note:
Coat sealing rings of quick-connect couplings with antiseize agent.

Pressure pipes must audibly snap into place
Fig. 404: Identifying Charge-Air Duct With Special Tool 11 8 670

Assemble engine.
Check DME (turbocharger) for correct operation.
11 61 050 REMOVING AND INSTALLING INTAKE PLENUM (N54, N54T)
2010 BMW Z4 30i
Remove INTAKE FILTER HOUSING

REMOVE ENGINE COVER
If necessary, remove TENSION STRUT (risk of damage to charging pressure sensor)
Release screws on CHARGE AIR DUCT at rear (do not remove)
Pull off vacuum hose (1).
Detach tank vent valve (2) from mounting.
Release hose (3) and lay to one side.
Fig. 405: Identifying Vacuum Hoses And Tank Vent Valve

Disconnect plug connection (1) on oil pressure switch (2).
Fig. 406: Identifying Oil Pressure Sensor And Plug

2010 BMW Z4 30i
NOTE: Do not detach fuel line.
Unscrew nuts (3).
Release screw (4).
Fig. 407: Identifying Retainers, Plug Connection With Screws And Nuts
Raise intake air manifold.
Release screws (1).
Place cable duct (2) to one side.
Fig. 408: Identifying Cable Duct And Screws

2010 BMW Z4 30i
Cut cable tie (1).
Installation note:
Replace all seals (3).
Fig. 409: Identifying Cable Tie, Plug Connection And Seals

Installation note:
Replace all seals.
Assemble engine.
SUPERCHARGER WITH CONTROL

11 65 022 REMOVING AND INSTALLING/REPLACE EXHAUST TURBOCHARGER FOR
CYLINDERS 1-3 (N54, N54T)
IMPORTANT: It is not necessary to carry out a chassis/wheel alignment check to release the
steering tie rod.
Remove both catalytic converters. See 1832050 REMOVING AND INSTALLING/REPLACING

CATALYTIC EXHAUST-GAS CONVERTER FOR CYLINDERS 1-3 (N54) or 1832060
REMOVING AND INSTALLING/REPLACING CATALYTIC EXHAUST-GAS CONVERTER
FOR CYLINDERS 4-6 (N54)
Release right TIE ROD from steering gear
Drain COOLANT
Remove coolant EXPANSION TANK
Remove COOLANT THERMOSTAT
2010 BMW Z4 30i
Remove COOLANT PUMP

Remove both vacuum accumulators with bracket
Remove right CHARGE-AIR DUCT
Drain ENGINE OIL and collect in a clean container, oil is reused
Release screws (1) and remove protective plate (2) above tie rod.
Fig. 410: Identifying Protective Plate And Screws

Release screws (1).
Installation note:
Replace gasket.
Release screw (2).
Remove oil return pipe in direction of arrow.
Installation note:
Replace O-ring.
2010 BMW Z4 30i

Undo screws (1 and 2)
Release coolant feed lines (3 and 4) if necessary with suitable pliers.
IMPORTANT: Do not place pliers on pipes. Risk of damage!
Fig. 412: Identifying Coolant Feed Line With Mounting Screws

Release screws (1).
Installation note:
2010 BMW Z4 30i
Replace O-ring.
Fig. 413: Identifying Feed Line With Mounting Screws

Release screw (1).
Release coolant return pipe at connection (2) if necessary with suitable pliers.
Release screw (3).
Release coolant return pipe at connection (4) if necessary with suitable pliers.
Unfasten coolant return pipe.
Fig. 414: Identifying Pipe Connections And Screws

2010 BMW Z4 30i
Release screws (1).
Remove retaining plate (2).
Release screws (3).
Fig. 415: Identifying Retaining Plate And Screws

Remove heat shield (1) in direction of arrow.
NOTE: Carefully swing out heat shield (1) in direction of arrow.
Risk of damage!
Coolant feed pipe can be removed with heat shield (1).
2010 BMW Z4 30i
Fig. 416: Identifying Heat Shield

Release screws (1).
Set holder (2) down on cylinder head cover.
Fig. 417: Identifying Holder And Screws

Release screw (1).
Detach oil feed line in direction of arrow.
Installation note:
Replace O-ring.
2010 BMW Z4 30i
Fig. 418: Disconnecting Oil Feed Line

Release screw (1).
Release oil pressure line (2) if necessary with suitable pliers.
Installation note:
Replace O-rings.
Fig. 419: Identifying Oil Pressure Line

Detach vacuum hose from vacuum unit (wastegate valve).
Unscrew nuts (1).
2010 BMW Z4 30i
Remove turbocharger towards top.
IMPORTANT: Do not misuse linkage of vacuum unit (wastegate valve) for transportation.
Risk of damage!
Fig. 420: Identifying Nuts

Release screw (2).
IMPORTANT: Where necessary, to release the oil feed line (3), do not place pliers on the pipe.
Risk of damage!
Installation note:
Replace O-rings.
2010 BMW Z4 30i
Fig. 421: Identifying Oil Feed Line And Screws

Installation note:
Replace graphite sealing rings (1).
NOTE: Picture shows turbocharger for cylinders 4 to 6.
Assemble engine.
Delete fault memory in Digital Engine Electronics.
Check air intake system for leaks.
Observe DME instructions.
11 65 024 REMOVING AND INSTALLING/REPLACE EXHAUST TURBOCHARGER FOR

CYLINDERS 4-6 (N54, N54T)
Remove both catalytic converters. See 1832050 REMOVING AND INSTALLING/REPLACING

CATALYTIC EXHAUST-GAS CONVERTER FOR CYLINDERS 1-3 (N54) or 1832060
REMOVING AND INSTALLING/REPLACING CATALYTIC EXHAUST-GAS CONVERTER
FOR CYLINDERS 4-6 (N54)
Drain COOLANT
Remove coolant EXPANSION TANK
Remove both vacuum reservoirs
Remove right CHARGE AIR DUCT
Drain ENGINE OIL and collect in a clean container, oil is reused
Remove RIGHT ENGINE SUPPORT ARM
2010 BMW Z4 30i
Release screws (1).
Installation note:
Replace gasket.
Release screw (2).
Remove oil return pipe in direction of arrow.
Installation note:
Replace O-ring.

Release coolant feed lines (3 and 4) if necessary with suitable pliers.
Installation note:
Replace O-rings.
2010 BMW Z4 30i
Fig. 423: Identifying Coolant Feed Line With Mounting Screws

Release screws (1).
Installation note:
Replace O-ring.
Fig. 424: Identifying Feed Line And Screws

Release snap ring (1) from linkage of wastegate valve and disengage linkage.
Release screw (5).
2010 BMW Z4 30i
Release coolant return pipe if necessary with suitable pliers.
Release screw (4).
Release coolant feed pipe (2) if necessary with suitable pliers.
Release coolant return pipe (3) if necessary with suitable pliers and remove.
Fig. 425: Identifying Snap Ring, Coolant Return Line And Screws
Installation note:
Replace O-rings.
Release screws (1).
Remove retaining plate (2).
2010 BMW Z4 30i
Fig. 426: Identifying Retaining Plates And Screws

IMPORTANT: Carefully swing out heat shields (2 and 3) in direction of arrow.
Risk of damage!
NOTE: Coolant feed pipe (1) can be removed with heat shield (2).
Fig. 427: Removing Heat Shield

Release screw (1).
Detach oil feed line in direction of arrow.
2010 BMW Z4 30i
Installation note:
Replace O-ring.
Fig. 428: Removing Oil Feed

Release screws (1).
Set holder (2) down on cylinder head cover.
Picture shows E9x.
Fig. 429: Identifying Holder And Screws

Detach vacuum hose from vacuum unit (wastegate valve).
Unscrew nuts (1).
2010 BMW Z4 30i
Remove turbocharger towards bottom.
IMPORTANT: Do not misuse linkage of vacuum unit (wastegate valve) for transportation.
Risk of damage!
Picture shows E9x.
Fig. 430: Identifying Nuts

Release screw (2).
IMPORTANT: Where necessary, to release the oil feed line (3), do not place pliers on the pipe.
Risk of damage!
Installation note:
Replace O-rings.
2010 BMW Z4 30i
Fig. 431: Identifying Oil Feed Line And Graphite Sealing Rings
Installation note:
Replace graphite sealing rings (1).
Assemble engine.
Delete fault memory in Digital Engine Electronics.
Check air intake system for leaks.
Observe DME instructions.
11 65 580 REPLACING VACUUM UNIT (WASTEGATE VALVE) (N54, N54T)
IMPORTANT: Overpressure and vacuum lines are identified by the size of the seals and
colour-coded Red and Blue and must not be mixed up with each other.
Build up pressure with Blue color.
Generate vacuum pressure with Red color.
Check ease of movement between turnbuckle and pin of adjusting lever

(ensure rectangularity).
Note on ordering:
Workshop equipment
Workshop planning
Workshop equipment catalogue
Measuring and test equipment
2010 BMW Z4 30i
No. 81 29 0 426 464
Prepare BMW diagnosis system

Start diagnosis program
Wahrnehmung:
1. Noises at exhaust turbocharger (clanking)
Or Fault entry:
1. Drive
2. Engine electronics
3. Air supply
4. Charging pressure control
Remove both exhaust turbochargers
Release locking clip (2).
Disengage linkage of vacuum unit (wastegate valve).
Fig. 432: Identifying Lock Nut And Locking Clip

Check linkage and valve for wear
Connect vacuum line (1) to vacuum unit (wastegate valve).
Vacuum linkage must retract to stop.
2010 BMW Z4 30i
Wastegate valve must be sealed off by hand.
Fig. 433: Identifying Vacuum Line

Release lock nut on controller (1).
Press setting with measurement.
Determine ambient pressure

Seal stop cock (2) in direction of arrow
Set controller (1) to 500 ± 10 mbar below ambient pressure (e.g. 980 - 500 = 480 mbar)
Open stop cock (2) again.
Wastegate linkage closes.
Fig. 434: Releasing Lock Nut On Controller

Determine gap dimension.
2010 BMW Z4 30i
Gap dimension between turnbuckle and adjusting lever.
Fig. 435: Identifying Gap Dimension Between Turnbuckle And Adjusting Lever
Seal off wastegate valve (1) by hand in direction of arrow up to stop.
The turbocharger must be replaced if a 1.5 mm drill bit can be inserted as pictured.
NOTE: Gap dimension = 1.5 mm.
Fig. 436: Sealing Off Wastegate Valve

The turbocharger is OK if a 1.5 mm drill bit cannot be inserted or can only be inserted at an angle as pictured.
NOTE: Gap dimension > or = 1.5 mm.
2010 BMW Z4 30i
Fig. 437: Identifying Drill Bit Dimension

Installation note:
Replace vacuum unit 2 (wastegate valve).

Adjusting vacuum unit (wastegate valve) linkage
Initial position of vacuum unit (wastegate valve) linkage depressurized.
Connect red vacuum line (1) to vacuum unit (wastegate valve).
2010 BMW Z4 30i
Fig. 439: Identifying Red Vacuum Line

Vacuum pressure measurement
Prepare BMW diagnosis system on vacuum diagnosis unit.
1. Screw in pressure sensor.

2. Connect 12V battery cables (2) to vehicle battery positive and negative.
3. Connect 12V battery cables (3) to vehicle battery positive and negative (pump operation max. 3 mins.) .
4. Controller for vacuum connection.
5. Vacuum connection (Red).
Fig. 440: Identifying Vacuum Pressure Measurement Set-Up

Calibration for vacuum pressure measurement
Release lock nut on controller (1).
Press setting with measurement.
2010 BMW Z4 30i
Determine ambient pressure

Seal stop cock (2) in direction of arrow
Set controller (1) to 200 ± 10 mbar below ambient pressure (e.g. 980 - 200 = 780 mbar).
Open stop cock (2) again.
Wastegate valve closes.
Fig. 441: Releasing Lock Nut On Controller

Initial position (1) of wastegate linkage with preset vacuum pressure.
Wastegate valve virtually closed.
Fig. 442: Identifying Initial Position Of Wastegate Linkage With Preset Vacuum Pressure
Checking turnability at wastegate valve
a. Wastegate valve can be turned with minimal force.
2010 BMW Z4 30i
Adjustment at wastegate valve is OK.
b. Wastegate valve has play and can be turned without resistance, wastegate valve open too far.
Carry out adjustment at wastegate valve, shorten linkage.
c. Wastegate valve cannot be turned, wastegate valve closed.
Carry out adjustment at wastegate valve, lengthen linkage.
Fig. 443: Checking Wastegate Valve Turnability

Adjustment at linkage
To lengthen linkage, turn turnbuckle (1) max. 180° in counterclockwise direction.
To shorten linkage, turn turnbuckle (1) max. 180° in clockwise direction.
Engage turnbuckle (1) on adjusting lever in direction of arrow.
IMPORTANT: Check ease of movement between turnbuckle (1) and pin of adjusting lever
(ensure rectangularity).
2010 BMW Z4 30i
Fig. 444: Engaging Turnbuckle On Adjusting Lever

Check turnability at wastegate valve again.
Secure lock nut (1); to do so, secure turnbuckle against turning with a suitable tool.
Mount locking clip (2).
Fig. 445: Identifying Lock Nut And Locking Clip

Assemble engine.
Observe diagnosis instructions.
Execute test module for boost pressure control.
VACUUM PUMP
2010 BMW Z4 30i
11 66 000 REMOVING AND INSTALLING OR REPLACING VACUUM/OIL PUMP (N47 D20 O1)
IMPORTANT: It is possible to remove and install the vacuum oil pump without removing the
transmission.
Removing oil sump.
Release screws (1).
Remove intake snorkel in direction of arrow.
Fig. 446: Removing Intake Snorkel

Release screw (1).
2010 BMW Z4 30i

Release screws (1).
Installation note:

Release screws (1).
When installed, the oil pump chain must be fed out from the sprocket wheel of the oil pump drive gear; the
sprocket wheel cannot be removed.
2010 BMW Z4 30i
NOTE: Illustration shows gear case cover removed.

Oil vacuum pump must be fed out at chain drive (1).
Fig. 450: Identifying Chain Drive

Feed out oil vacuum pump (1) in direction of arrow and remove.
Installation in reverse sequence.
Installation note:
2010 BMW Z4 30i
Fig. 451: Identifying Oil Vacuum Pump

Install all screws (1) and tighten down.
Tightening torque, see 11 41 1AZ in 11 41 OIL PUMP WITH STRAINER AND DRIVE

Install and tighten down screws (1).
2010 BMW Z4 30i

Installation note:
Insert and secure screw (1).
Tightening torque, see 11 41 2AZ in 11 41 OIL PUMP WITH STRAINER AND DRIVE .

Assemble engine.
2010 BMW Z4 30i
11 66 000 REMOVING AND INSTALLING/REPLACING VACUUM PUMP (N54, N54T)
Remove DRIVE BELT.

Remove BELT TENSIONER for drive belt.
Remove SEALING CAP for vacuum pump.
Remove HIGH PRESSURE PUMP .
Rotate crankshaft at central bolt.
Turn camshaft sprocket until drilled holes and screws of vacuum pump match up.
Screw in special tool 11 8 650
Secure special tool 11 0 290 in camshaft sprocket and to special tool 11 8 650 .
Release screw (1).
Press chain tensioner (1) with chain in direction of arrow.
Install special tool 11 4 120 .
Remove camshaft sprocket (2) in direction of arrow.
2010 BMW Z4 30i
Fig. 456: Removing Sprocket Wheel

Release screws (1).
Release screws (1).
Secure screws (1) against falling.
Remove vacuum pump.
Installation note:
Replace gasket.
Fig. 457: Identifying Vacuum Pump Screws

Assemble engine.
2010 BMW Z4 30i
EMISSION CONTROL, OXYGEN SENSOR

11 78 513 REPLACING BOTH OXYGEN CONTROL SENSORS (N54, N54T)
WARNING: Risk of burning!
Work should only be carried out on an exhaust system that has cooled
down.
Remove ACOUSTIC COVER

Release right TIE ROD from steering gear
NOTE: It is not necessary to conduct a chassis/wheel alignment check when the track
rod is released.
Installation note:
If an oxygen sensor is reused, only apply a thin and uniform coat of Never Seez Compound (refer to BMW
Parts Service) to thread.
The part of the oxygen control sensor which projects into the exhaust system branch (sensor ceramic) must not
be cleaned or come into contact with lubricant.
Remove protective plate over steering gear.
Release screws (1) and remove protective plate (2).
Fig. 458: Identifying Protective Plate And Screws
2010 BMW Z4 30i
Disconnect plug connection for oxygen control sensor, cylinders 1 to 3.
Release oxygen control sensor (1) with special tools 11 7 030 and 11 9 150 .
IMPORTANT: When using special tool 11 7 030 in conjunction with special tool 11 9 150 , it is
essential to reduce the prescribed tightening torque by 3 Nm.
Installation note:
Cable color black, cylinders 1 to 3.
Fig. 459: Identifying Special Tool 11 7 030 And 11 9 150

Disconnect plug connection for oxygen control sensor, cylinders 4 to 6.
Release oxygen control sensor (1) with special tools 11 7 030 and 11 9 150 .
Installation note:
Cable color grey, cylinders 4 to 6.
2010 BMW Z4 30i
Fig. 460: Removing Oxygen Control Sensor Using Special Tools 11 7 030 And 11 9 150
Assemble engine.
11 78 545 REPLACING BOTH OXYGEN MONITORING SENSORS (N54, N54T)
WARNING: Risk of burning!
Work should only be carried out on an exhaust system that has cooled
down.
Remove rear UNDERBODY PROTECTION
Installation note:
If an oxygen sensor is to be reused, only apply a thin and uniform coat of Never Seez Compound (refer to
BMW Parts Department) to thread.
The part of the oxygen monitoring sensor which projects into the exhaust system branch (sensor ceramic) must
not be cleaned or come into contact with lubricant.
Disconnect plug connection for oxygen monitoring sensor.
Release monitoring sensor (1) with special tools 11 7 030 and 11 9 150 .
2010 BMW Z4 30i
Installation note:
Cable color black, cylinders 1 to 3.
Fig. 461: Removing Monitor Sensor Using Special Tools 11 7 030 And 11 9 150
NOTE: Release insulation (2) in direction of arrow.
Disconnect plug connection for oxygen monitoring sensor.
Release monitoring sensor (1) with special tool 11 7 020 .
Installation note:
Cable color grey, cylinders 4 to 6.
Fig. 462: Removing Insulation

2010 BMW Z4 30i
Assemble engine.

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2010 BMW Z4 30i

ENGINE Engine - Repair - Z4

Read out fault memory of DME control unit

IMPORTANT: High tension - mortal danger!

Interrupt power supply to ignition coils.

Read and comply with notes on compression pressure check.

Necessary preliminary tasks

Remove spark plugs

Unscrew tip (1) from special tool 11 0 222.

Fig. 1: Removing Tip From Special Tool 11 0 222

Prepare special tool 11 0 222 in conjunction with 11 8 732 and 11 8 731.

domingo, 3 de octubre de 2021 10:22:26

Fig. 2: Identifying Special Tool 11 0 222, 11 8 732 And 11 8 731

Screw special tool 11 0 222 into special tool 11 8 731 to 10 Nm.

IMPORTANT: Oil thread on special tool 11 8 731.

Fig. 3: Inserting Special Tool 11 0 222 Into Special Tool 11 8 731

NOMINAL VALUES , compression pressure

Fig. 4: Installing Special Tool 11 0 222 Into Spark Plug Thread

Delete fault memory.

00 DANGER OF POISONING IF OIL IS INGESTED/ABSORBED THROUGH THE SKIN

Ingesting oil or absorbing through the skin may cause poisoning!

Possible symptoms are:

Protective measures/rules of conduct

Pour oil only into appropriately marked containers

First aid measures

Do not induce vomiting.

Punch engine numbers at marked surface with number punch.

Magnesium crankcase with sticker

Fig. 5: Identifying Engine Identification Numbers Location (M47/M47TU/M47T2)

Fig. 6: Identifying Engine Identification Numbers Location - M57/M57TU/M57T2

Fig. 7: Identifying Engine Identification Numbers Location - M67/M67TU

Fig. 8: Identifying Engine Identification Numbers Location - N47/N47S/N47C/N57 N57S

Fig. 9: Identifying Engine Identification Numbers Location (M52 / M52TU)

Fig. 10: Identifying Engine Identification Numbers Location (M54)

Fig. 11: Identifying Engine Identification Numbers Location - M56

Fig. 12: Identifying Engine Identification Numbers Location - N40/N45/N45T/N43

Fig. 13: Identifying Engine Identification Numbers Location - N42/N46/N46T

Fig. 14: Identifying Engine Identification Numbers Location - N51/N52/N52K/N52T/N53/N54/N55

Fig. 15: Identifying Engine Identification Numbers Location - N62/N62TU

Fig. 16: Identifying Engine Identification Numbers Location - N73

Fig. 17: Identifying Engine Identification Numbers Location - S54

Fig. 18: Identifying Engine Identification Numbers Location - S85/S65

Fig. 19: Identifying Engine Identification - W10/W11

Fig. 20: Identifying Engine Identification Numbers Location - N12/N14/N16/N18

Fig. 21: Identifying Engine Identification Numbers Location - W17

11 00... ENGINE OIL SERVICE (N54, N54T)

WARNING: Risk of scalding!

Observe the exact engine oil filling capacity.

Checking and drip-off times (at least 10 minutes) must be observed.

IMPORTANT: Risk of damage!

Protect belt drive against dirt.

Cover with suitable materials.

Catch and dispose of drained engine oil in a suitable collecting vessel.

Observe country-specific waste disposal regulations.

Release oil filter cover with special tool 11 9 240 .

Tightening torque 11 42 1AZ .

Picture shows E9x

NOTE: Presentation: without underbody protection.

Unclip service opening on underbody protection.