Symptom Tree t092
| Cause | Correction |
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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 Procedure 007-025 and 007-013 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239. |
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Engine idle time is excessive |
Low oil and coolant temperatures can be caused by long idle time (greater than 10 minutes). Shut off the engine rather than idle for long periods. If idle time is necessary, raise the idle speed. Procedure 007-025 and 007-013 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239 |
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Fuel pump seal is leaking |
Confirm fuel seal leakage at the fuel pump wheep hole. Refer to Procedure 005-016 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239. |
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Top injector o-ring or injector timing plunger is damaged |
Perform the fluorescent dye tracer test to find the bad injector. Replace the injector or o-ring. Refer to Procedure 006-026 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239. |
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Fuel drain line restriction |
Check the fuel drain lines for restriction. Refer to Procedure 006-012 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239. |
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Injector is malfunctioning |
Perform the cylinder performance test. Replace injectors as necessary. Refer to Procedure 006-026 or 014-008 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239. |
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Cylinder head is cracked or porous |
Remove intake and exhaust manifolds. Check for evidence of coolant leak. If necessary, operate engine at low idle. Pressure-test the cylinder head. Refer to Procedure 002-004 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239. |
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Base engine problem |
Check the engine for high crankcase pressure, low compression, static injection timing, damaged pistons, camshaft, and other parts. Procedure 002-004 in the Troubleshooting and Repair Manual, Signature, ISX and QSX15 Engines, Bulletin 3666239 |
