Operation and maintenance manual

Troubleshooting Symptoms Charts QSB4.5 and QSB6.7
Page TS-64 Section TS - Troubleshooting Symptoms
Turbocharger Leaks Engine Oil or Fuel
Cause Correction
STEP 1
Engine is operating for extended periods under
light or no-load conditions (slobbering)
.............
Review the engine operating instructions. Refer to
Section 1.
OK
Go To Next Step
STEP 2
Lubricating oil or fuel is entering the turbocharger
.............
Remove the intake and exhaust piping, and check
for oil or fuel. Refer to Section 3.
OK
Go To Next Step
STEP 3
Turbocharger oil drain line is restricted
.............
Remove the turbocharger oil drain line and check
for restriction. Clean or replace the oil drain line.
Refer to an Authorized Cummins Repair Facility.
OK
Go To Next Step
STEP 4
Turbocharger oil supply line loose or leaking
.............
Check and tighten oil supply line fitting(s), if
necessary. Refer to an Authorized Cummins
Repair Facility.
OK
Go To Next Step
STEP 5
Contact a Cummins® Authorized Repair Facility