Centinel System – Repair Manual – Fuel in the Lubricating Oil

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 007-083 in Section 7 and
Procedure 007-013 in Section 7.

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 Bulletin 4021334 for ISX CM870 engines and
Bulletin 4021560 for ISX CM871 engines.

Fuel drain line is restricted

Inspect the fuel drain lines for restrictions. Remove any restrictions found. Refer to
Procedure 006-012 in Section 6
.

Fuel pump seal is leaking

Perform the fluorescent dye tracer test to confirm the fuel leak. Replace the fuel pump if necessary. Refer to
Procedure 005-016 in Section 5
.

Injector(s) are malfunctioning

Perform diagnostics to find the damaged injector(s). Replace the injector(s) as necessary. Refer to Bulletin 4021334, Section TT, 70-t02-1001, Guided Step 5, for ISX CM870 engines.Procedure 014-008 for ISX CM870 and ISX CM871 engines.Refer to Bulletin 4021560, Section TT, 16-t02-1001a, Guided Step 5, for ISX CM871 engines.

Top injector o-ring or injector timing plunger is damaged

Perform the fluorescent dye tracer test to find the damaged injector. Replace the injector or o-ring. Refer to
Procedure 006-026 in Section 6
.

Injector has blown or missing plug ball

Inspect the injectors for blown or missing plug balls. Refer to
Procedure 006-026 in Section 6
.

Cylinder head is cracked or porous

Perform the fuel passage leak test in the cylinder head. Refer to
Procedure 002-004 in Section 2
.

Base engine problem

Check the engine for high crankcase pressure, low compression, static injection timing, damaged pistons, camshaft, and other parts. Refer to
Procedure 002-004 in Section 2
.