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Cummins ISX11.9 CM2250 – Service Manual Lubricating Oil in the Fuel

Symptom Tree  t101

This is symptom tree t101
Cause Correction

Asphaltines present

When asphaltines are present in diesel fuel, it appears black. To verify whether or not engine oil is present, take a fuel sample and perform an analysis to check for engine oil.

 

Cylinder head is cracked or porous

Remove the intake and the exhaust manifolds. Check for evidence of coolant leaks. If necessary, operate the engine at low idle. Pressure test the cylinder head. Refer to
Procedure 002-004 in Section 2
.

 

Fuel pump plungers and barrels excessively scored and worn

Inspect the plungers. A slight discoloration can be evident. Deep scoring must not be evident. If scoring or scratches exist that can be felt, the fuel pump head must be replaced. Refer to
Procedure 005-227 in Section 5
.

 
Last Modified:  09-Jul-2010