Manual Bomba Injectora STANADYNE DB4

Stanadyne DB2 and DB4 Pump Removal and Installation
Removal
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All Stanadyne DB4 and most DB2 injection pumps will have a retained drive shaft
(shaft stays in the pump when pump is removed from engine).
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Clean the exterior of the injection pump and mounting surfaces.
IMPORTANT: Never steam clean or pour cold water on an Injection pump while
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the pump is running or while it is warm. To do so may cause seizure of the
injection pump.
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1. Disconnect shut-off cable and speed control linkage, if equipped.
2. Disconnect electrical connection to shut-off solenoid or throttle positioning
solenoid, if equipped. Disconnect cold start switch, if equipped. Tag
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electrical wires for correct reassembly.
3. Disconnect all high pressure injection lines
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IMPORTANT: ALWAYS use a backup wrench when loosening or tightening fuel
lines at injection pump so that discharge fittings are not altered to prevent
possible internal pump damage.
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4. Disconnect fuel return line and fuel supply line.

5. Remove injection pump drive gear cover.
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Shown removed (on John Deere Application)

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6. Remove injection pump drive gear cover (shown removed). Remove drive
gear retaining nut and washer from end of pump shaft. Be careful not to let
washer fall inside timing gear cover.
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NOTE: The injection pump drive gear fits snugly onto a tapered drive shaft and
is indexed by a hollow pin or Woodruff key installed in drive shaft.
7. Use a gear puller to remove the drive gear from the tapered shaft. Use
care not to damage the end of the injection pump drive shaft.
EUGENE
4036 West 1st Ave.
Eugene, OR 97402
(541) 485-1434
www.oregonfuelinjection.com
Housing Timed Injection Pumps:
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Check to make sure marks are present, and lined up, on both the pump mounting
flange (B) and on the front cover (A). If the timing mark is not clearly visible,
scribe a line on the front cover that matches the timing line on the injection pump.
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8. Remove the injection pump mounting nuts and remove the injection pump
from the mounting studs.
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Inspection
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1. Inspect injection pump mounting hole in cylinder block making sure it is

clean and free of burrs.
2. Inspect the pump mounting surface making sure that it is clean and smooth
and free of burrs.
3. Inspect injection pump drive shaft for presence of metal transfer from gear
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slippage. Also, check to see if index pin in shaft is not damaged, indicating
gear slippage.
4. If the shaft shows signs of gear slippage, the injection pump is very likely
seized, and the cause of the seizure must be found before reinstalling a
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repaired or replaced pump. The drive gear must also be changed

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Installation
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Injection pump mounting flange timing mark (B) and front plate timing mark (A)
presence and alignment MUST BE verified before removing pumps from engine,
when the pump is reinstalled on engine, time pump by aligning these two
(external) marks. DO NOT reference internal timing marks (on pump cam ring
and governor weight retainer) for accurate pump timing.
EUGENE
4036 West 1st Ave.
Eugene, OR 97402
(541) 485-1434
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1. Install seal into groove on front face of pump mounting flange. Slide
injection pump onto mounting studs while inserting pump shaft into drive
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gear.
2. Check pump shaft and index pin for proper alignment with pump drive gear
key slot.
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IMPORTANT: Shaft roll pin may be easily damaged if improperly assembled.
Pump drive gear should not move when initially installing pump index pin into
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drive gear key slot.
3. Pump should sit squarely and solidly on mounting pad when a slight
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pressure is applied.
IMPORTANT: DO NOT use tightening force of pump mounting stud nuts to pull
pump shaft into drive gear
4. With the pump shaft index pin properly engaged in the drive gear key slot,
finger-tighten mounting stud nuts.
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5. Push pump drive gear firmly onto shaft taper. Install washer and retaining
nut (C) onto end of shaft. Tighten retaining nut to the specified torque, per
your engine service manual. Install access cover plate using a new
O-ring, if needed.
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6. Align timing mark on pump flange with timing mark on front plate.
7. Tighten the mounting nuts/bolts securely.
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8. Then install the injection lines, but leave the injector ends loose.
9. Reconnect the fuel inlet and return line, leaving the inlet line loose for
bleeding procedures.
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10. Reconnect the shutoff solenoid (if equipped)

11. Reconnect the throttle linkage.
EUGENE
4036 West 1st Ave.
Eugene, OR 97402
(541) 485-1434
Priming and Starting
1. Open the bleeder screw on the secondary filter (if equipped) and operate
the hand primer to bleed the air from the system.
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2. When fuel flows freely from the fuel inlet line, tighten the fuel inlet line at the
injection pump.
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3. Leave the shut off disconnected or in the off position and crank the engine
over for 10 seconds.
4. Connect the electrical shut off solenoid.
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5. Crank the engine to start.
6. If the engine will not start, loosen the injection lines at the injectors, one line
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at a time. Crank the engine over until fuel free of bubbles flows from the
injector, tighten the injection line.
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Use two open ended wrenches if if

needed.
You can experience an airlock while

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trying to bleed the fuel system if all of

the injection lines are loose at one time
while cranking the engine.
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EUGENE
4036 West 1st Ave.
Eugene, OR 97402
(541) 485-1434

Manual Bomba Injectora STANADYNE DB4

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Stanadyne DB2 and DB4 Pump Removal and Installation

4. Disconnect fuel return line and fuel supply line.

Shown removed (on John Deere Application)

1. Inspect injection pump mounting hole in cylinder block making sure it is

repaired or replaced pump. The drive gear must also be changed

10. Reconnect the shutoff solenoid (if equipped)

Use two open ended wrenches if if

You can experience an airlock while

trying to bleed the fuel system if all of

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