TM10-3950-672-24-2
Since the oil cooler design does not require gaskets or
seals to maintain the separation of oil and coolant, the
element itself must leak to allow mixing of the fluids
(refer to page 6-21).
During operation the oil pressure will be higher than
coolant pressure. A leak in the oil cooler will show as oil
in the coolant.
However, following an engine shutdown, the residual
pressure in the coolant system can cause coolant to
seep through the leak path into the oil.
Fuel Diluted Oil
Fuel dilution is limited to four sources:
1.
Injection pump shaft seal
2.
Fuel leaking by the rings
3.
Lift pump
4.
A crack in the cylinder head from the fuel filter
location to the air intake
5-124