TM10-3950-672-24-2
Use the following logic to determine the source of the oil dilution with fuel:
Power Low - Increased
Power Normal
White Smoke During
Power Low - Increased
⇓
Start Up -
Black Smoke
Check Lift Pump For
⇓
⇓
Seal Leakage
Verify the Rings are
⇓
Check/Replace the
Sealing by Performing a
Injectors
Compression Check
Replace the Fuel
Pump
A worn or damaged injection pump shaft seal will allow
fuel to leak into the gear housing and then into the oil
pan.
The seal is designed to provide increased sealing as the
pump case pressure increases. Pressure forces the lip
(1) tighter around the shaft.
A worn seal is more apt to leak during start up and shut
down when case pressure is low.
Caution
A worn seal can not be detected by pressurizing the
pump.
Remove the access cover and rotate the engine so one
of the holes in the fuel pump gear exposes the back
gear housing.
Activate the fuel shut down valve by turning the switch
to the ON position.
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