Fuel in Engine Oil
Note: Refer to Truck Engine News, SEBD6568 January 1987, "Fuel Dilution Troubleshooting Procedure" for information on testing the components of the fuel system.
- Loose fuel line
- Fuel injector nozzle
- Fuel transfer pump
- Fuel injection pump
Visually inspect the fuel lines under the rocker arm cover. Tighten the fuel line nuts to 40 ± 7 N·m (30 ± 5 lb ft).
A loose purging screw can cause fuel to leak into the engine oil. Inspect the purging screw for leaks. Tighten the purging screw to 1.6 ± .4 N·m (14 ± 4 lb in).
Check the fuel transfer pump for an internal leak. A internal leak past the pushrod will allow fuel to enter the crankcase. Refer to Systems Operation/Testing and Adjusting, "3406C Diesel Truck Engine".
Internal leakage of the fuel injection pump can cause dilution of the engine oil. Refer to Systems Operation/Testing and Adjusting, "3406C Diesel Truck Engine".
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