Symptom Tree t102
| Cause | Correction |
|---|
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Verify the oil consumption rate |
Check the amount of oil added versus the mileage. |
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Lubricating oil leak (external) |
Inspect the engine for external oil leaks. Tighten the capscrews, pipe plugs, and fittings. Replace gaskets, if necessary. Refer to Section V for specifications. |
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Lubricating oil dipstick calibration is not correct |
Check the dipstick calibration. Refer to Procedure 007-009. |
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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 007-009 |
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|
Lubricating oil does not meet specifications for operating conditions |
Change the oil and filters. Refer to Procedures 007-013, 007-025 and Cummins Engine Oil Recommendations, Bulletin 3810340. |
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|
Air compressor is pumping lubricating oil into the air system |
Check the air lines for carbon buildup and lubricating oil. Refer to Procedure 012-003. |
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Lubricating oil temperature is above specification |
Refer to the Lubricating Oil Temperature Above Specification symptom tree. |
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Lubricating oil drain interval is excessive |
Verify the correct lubricating oil drain interval. Refer to the Operation and Maintenance Manual, B5.9G, B5.9LPG, B Gas Plus, and B LPG Plus Engines, Bulletin 3666112. |
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Lubricating oil pump is malfunctioning or the o-rings are damaged |
Inspect the lubricating oil pump and o-rings. Refer to Procedure 007-031. |
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Lubricating oil cooler is leaking oil |
Check the lubricating oil cooler for oil leaks. Refer to Procedure 007-003. |
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Turbocharger oil seal is leaking |
Check the turbocharger compressor and turbine seals. Refer to Procedures 010-040 and 010-049. |
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Crankcase ventilation filter is restricted |
Check the filter minder on the top of the closed crankcase ventilation canister. Refer to Procedure 003-021. |
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Piston rings are not seated correctly (after an engine rebuild or piston installation) |
Check blowby. Refer to Section 14. If blowby is excessive, check the piston rings for correct seating. Refer to Procedures 001-043 and 001-047. |
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|
Piston, cylinder liner, or piston rings are worn or damaged |
Check for air intake system leaks. Refer to Procedure 010-024. Check the piston, piston rings, and liners for wear or damage. Refer to Procedures 001-043 and 001-047. |
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|
Valve stem clearance is excessive or the valve stem seals are damaged |
Check the valve stems and seals. Refer to Procedure 002-020. |
