Bulk oil supply is contaminated
Check the bulk oil supply. Drain the oil and replace with non-contaminated oil. Replace the oil filters. Refer to Procedure 007-037 in Section 7.
Electronic fault codes active or high counts of inactive fault codes
View and troubleshoot the fault codes with INSITETM electronic service tool. Refer to the
Troubleshooting and Repair Manual, CM21 00 and CM2150 Electronic Control System, Bulletin
4021570.
Engine idle time is excessive
Low oil and coolant temperatures can be caused by long idle times (greater than 10 minutes). Shut
off the engine rather than idle for long periods. If idle time is necessary, raise the idle speed. Refer
to the Troubleshooting and Repair Manual, CM21 00 and CM2150 Electronic.control System,
Bulletin 4021570.
Aftertreatment System active regeneration time is excessive
Check the aftertreatment system trip information with INSITETM electronic service tool. Low duty
cycle applications can possibly require more active regeneration time to keep the aftertreatment
system functioning correctly. Change the vehicle route and/or duty cycle to increase the load on the
engine in order to decrease the amount of active regeneration time.
Fuel drain line restriction
Check the fuel drain lines for restriction. Excessive fuel drain line restriction may result in
overpressurization of the fuel pump and cause fuel to leak from the fuel pump into the engine gear
housing. Refer to Procedure 006-012 in Section 6.
Injector is malfunctioning
Perform the Cylinder Cutout test with INSITETM electronic service tool. Refer to Procedure 014-008 in Section 14. Procedure 006-026 in Section 6.
Injector is malfunctioning
Perform an injector leakage test. Replace injectors as necessary. Refer to Procedure 006-026 in
Section 6.
Injector hold-down clamp capscrews are loose
Tighten capscrews to specification. Refer to Procedure 006-026 in Section 6.
Injector a-rings are damaged or missing and/or the injector sealing washers are not correct
Remove the injectors and inspect the injector o- rings. Replace the injector a-rings. Verify the
injector sealing washer thickness and replace the injector sealing washers as necessary. Refer to
Procedure 006-026 in Section 6.
Cylinder head is cracked or porous
Pressure test the cylinder head. Refer to Procedure 006-013 in Section 6 to disconnect the
fuel drain connection at the rear of the cylinder head. Pressure test the fuel drain drilling in the
cylinder head. See Procedure 002-004 in Section 2.
Internal engine damage
Analyze the oil and inspect the filters to locate an area of probable damage. Refer to Procedure
007-048 in Section 7 and Procedure 007-083 in Section 7.
