Operation and maintenance manual

Troubleshooting Symptoms Charts QSB4.5 and QSB6.7
Page TS-54 Section TS - Troubleshooting Symptoms
Lubricating Oil Contaminated
Cause Correction
STEP 1
Lubricating oil sludge is excessive
.............
Change the oil and filters. Refer to the Lubricating
Oil Sludge in the Crankcase Excessive symptom
tree.
OK
Go To Next Step
STEP 2
Lubricating oil is contaminated with coolant or fuel
.............
Change the oil and filters. Refer to Section 5. Use
the oil recommended in Section V.
OK
Go To Next Step
STEP 3
Fuel lift pump is malfunctioning
.............
Check the fuel lift pump for correct operation.
Check the pump output pressure. Replace the fuel
lift pump if necessary. Refer to an Authorized
Cummins Repair Facility.
OK
Go To Next Step
STEP 4
Bulk oil supply is contaminated
.............
Check the bulk oil supply. Drain the oil and replace
with noncontaminated oil. Replace the oil filter(s).
Refer to Section 5.
OK
Go To Next Step
STEP 5
Contact a Cummins® Authorized Repair Facility