ISM, ISMe, and QSM11 – Lubricating Oil Sludge in the Crankcase Excessive

Symptom Tree  t106

This is symptom tree t106
Cause Correction

Bulk oil supply is contaminated

Check the bulk oil supply. Drain the oil and replace with noncontaminated oil. Replace the oil filters. Refer to Procedure 007-025.


Lubricating oil does not meet specifications for operating conditions

Change the oil and filters. Refer to Procedure 007-013 or 007-025, and the Cummins Engine Oil Recommendations, Bulletin 3810340.


Lubricating oil drain interval is excessive

Verify the correct lubricating oil drain interval. Refer to Section 2 of the Operation and Maintenance Manual ISM and ISMe Engines, Bulletin 3666319.


Fuel grade is not correct for the application or the fuel quality is poor

Operate the engine from a tank of high-quality fuel. Refer to Fuels for Cummins Engines, Bulletin 3379001.


Lubricating oil is contaminated with coolant or fuel

Change the oil and filters. Refer to the Lubricating Oil Contaminated symptom tree.


Injector cup is damaged or is not correct

Check the injector cups for damage and for correct part numbers. Refer to Procedure 006-026.


Static injection timing is not correct

Check the static injection timing. Refer to 006-025.

Last Modified:  28-Mar-2005