Fuel Diluted Oil - Dodge D250 1990 Service Manual

Base Engine Components
DODGE Turbo Diesei
Engine Lubricating System
Page 9B-9
During operation the oil pressure wili 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
Use the following logic to determine the source of the oil
dilution with fuel.