Iveco NEF Engine (N40 ENT M25) Service Repair Manual PDF
Iveco NEF Engine (N40 ENT M25) Service Repair Manual PDF
Iveco NEF Engine (N40 ENT M25) Service Repair Manual PDF
FOREWORD
In particular
o Use of unsuitable fuels and oils may compromise the
engine’s regular operation, reducing its performance,
reliability and working life;
o Exclusive use of IVECO Original Parts is a necessary
condition to maintain the engine in its original integrity;
o Any tampering, modifications, or use of non-original
parts may jeopardize the safety of service personnel and
boat users.
SECTION CONTENTS
Section Page
1. OVERVIEW 5
2. TECHNICAL DATA 53
3. ELECTRICAL EQUIPMENT 59
4. DIAGNOSTICS 95
5. MAINTENANCE 121
6. SERVICING OPERATIONS
ON INSTALLED ENGINE 127
7. TOOLS 141
8. OVERHAUL 149
CAUTION
During the year 2005, some modifications were made to
the internal circuits of the relay box and to the wiring.
These modifications make incompatible and harmful the
use of the components supplied now together with the
components supplied before. Please refer to the instruc-
tion shown in Chapter 8.
N40 ENT M25
MARCH 2007 Overview
N60 ENT M37-M40
1.
SECTION 1
OVERVIEW
Page
IDENTIFYING DATA 7
COMMERCIAL CODE 8
ENGINE ARCHITECTURE 12
Crankcase 12
Crankshaft 13
Connecting Rods 13
Pistons 14
Cylinder head 16
Turbocompressor 19
Thermostatic valve 22
Water pump 22
Sea-water pump 24
Page Page
Pressure control with engine at maximum rating 35 Balance of the cylinder torque delivery 50
Electro-injectors 40 Recovery 51
Crankshaft sensor 45
Camshaft sensor 46
Figure 1
04_004_N
Figure 2
S. p. A.
Viale dell'Industria, 15/17 - 20010 Pregnana Mil.se MI - ITALY
ENGINE TYPE
HOMOLOGATION N°
04_002_N
Figure 3
1
1
04_007_N
N40 ENT M25
1. N60 ENT M37-M40
Overview MARCH 2007
COMMERCIAL CODE
The purpose of the commercial code is to make the characteristics of the product easier to understand, categorizing the engines
according to their family, origins and intended application. The commercial code, therefore, cannot be used for the technical
purpose of recognizing the engine’s components, which is served by the “ENGINE S/N”.
N 60 E N T M 37 . 1 0
VERSION
VERSION:
TURBOCHARGED:
1 = COOLED
2 = NOT COOLED
APPLICATION: M = MARINE
The model number is assigned by the manufacturer; it is used to identify the main characteristics of the engine, and to character-
ize its application and power output level. It is stamped on a side of crank-case, close to oil filter.
F 4 A E 0 6 8 6 B * E 1 0 3
VARIANTS TO
BASIC ENGINE
E = EMISSION FOR
MARINE APPLICATION
POWER RANGE:
B = MAXIMUM POWER 370 HP
NO. OF CYLINDERS
ENGINE
DESIGN ITERATION
Figure 4
7 8
9 10 11
6
4
12
13
3
2
1
17
04_006_N
16
15 14
1. Engine coolant discharge cap - 2. Electric starter motor - 3. Tube bundle engine coolant/sea-water heat exchanger - 4. Location
of sacrificial anode - 5. Cooled exhaust manifold - 6. Exhaust gas and sea-water discharge pipeline - 7. Cap for engine coolant outlet
to sanitary water heating system - 8. Lifting eyebolts - 9. Rocker arm cover - 10. Oil refill cap - 11. Coolant refill cap - 12. Location
of thermostatic valve - 13. Engine coolant tank - 14. Auxiliary belt automatic tensioner - 15. Alternator - 16. Cap for engine coolant
discharge and recirculation from sanitary water heating system - 17. Oil filter.
N40 ENT M25
MARCH 2007 Overview
N60 ENT M37-M40
1.11
Figure 5
12 13 14 15 16
11
10
9
8
7
17
04_007_N
5 4 3 2 1
1. Combustion air filter - 2. Common rail high pressure injection pump -3. Fuel filter - 4. Sea-water pump - 5. Sea-water inlet -
6. Throttle potentiometer - 7. Sacrificial anode - 8. Oil vapor separator - 9. Combustion air/sea-water heat exchanger - 10. Location
of sea-water discharge cap - 11. Manual lubricating oil extraction pump - 12. Combustion air pressure and temperature sensor -
13. Oil dipstick - 14. Common rail distributor - 15. Air filter clogging sensor - 16. Cooled turbocompressor - 17. Sea-water junction
pipe from after-cooler to engine coolant/sea-water heat exchanger.
N40 ENT M25
1.12 N60 ENT M37-M40
Overview MARCH 2007
ENGINE ARCHITECTURE
NEF engines are the highest expression of design and engi- The new criteria chosen in defining the parameters setting
neering efficiency that IVECO MOTORS-FPT makes avail- the combustion conditions, metering and injection, optimized
able on the market place. They are highly innovative engines instant by instant, enable to obtain a new balance between
designed to be able to comply now with the regulations on high performance and consumption reduction. NEF engines
fumes and acoustic emissions that will be enforced in the can be fitted with a mechanical pump or a total electronic
near future. controlled “Common Rail” fuel supply system.
Designed with innovative techniques and manufactured with Every technical solution has been accurately devised so as
advanced working processes, they are the result of hundreds to assure qualitative product perfection. The configuration
of years of design and engineering tradition as well as of an of the engine itself has been designed in such a way as to
important international cooperation. facilitate access to each individual part thus reducing main-
The excellent performance of NEF engines originates tenance time.
from induction and exhaust ducts of new design where, by Cylinder head fitted with four valves per cylinder, rear timing
improving the gas exchange phases, the intaken air turbo- control, new design connecting rods and aluminum-nickel
lence is improved, thus enabling the complete exploitation pistons are components of an engine fitted with 40% less
of the new injection system capacity. elements than an engine of equivalent performance.
Crankcase
Figure 6
1
8
2
7
04_011_N
1. Reconditionable integral cylinder barrels - 2. Water pump seat - 3. Camshaft bushing seat - 4. Oil pump seat - 5. Main bearings -
6. Crankcase backing plate - 7. Oil cooler (water/oil) seat - 8. Product model number location.
Moreover, within the cast iron crankcase, coolant circula- been grooved in. The backing plate (6) applied to the
tion grooves, ducts for lubrication loops for the various lower part makes the crankcase tougher and improves
machine parts and the seat for push rod bushings have resistance to stress.
N40 ENT M25
MARCH 2007 Overview
N60 ENT M37-M40
1.13
Crankshaft
Figure 7
1
3
2
04_012_N
1. Timing system driving gear - 2. Flywheel connecting hub - 3. Oil pump driving gear.
04_013_N
Figure 9 Figure 10
1
04_015_N
Figure 11
The pistons integrate the high swirl combustion chamber;
the annular chambers inside the junk ring enable an effective
heat elimination obtained by circulating the lubrication oil
delivered by the spray nozzles mounted on the crankcase.
On the piston skirt the are three seats for the retaining rings;
the first one of these is obtained by a special trapezoidal sec-
tion cast iron insert.
The piston rings have different functions and different 1
geometry.
3
- The 1st piston ring has a trapezoidal section and ceramic
chrome plating;
- The 2nd piston ring has a a torsional conical rectangular
seal;
- The 3rd piston ring has a double oil scraper with internal
spring.
04_021_N
The figure illustrates the position that the toothed wheel has
to have to set the correct timing strokes.
N40 ENT M25
MARCH 2007 Overview
N60 ENT M37-M40
1.15
Figure 12
3 5
4
6
7
8 9
11
10
04_016_N
1. Spindle - 2. Rocker - 3. Adjuster screw - 4. Rod - 5. Bridge - 6. Cotters - 7. Cup - 8. Spring - 9. Tappet - 10. Camshaft -
11. Holes for camshaft sensor.