Symptom Tree t122
| Cause | Correction |
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Engine is operating for extended periods under light- or no-load conditions (slobbering) |
Review the engine operating instructions in Section 1 of the Operation and Maintenance Manual, ISC and ISL Series Engines, Bulletin 4021428 or the Operation and Maintenance Manual, QSC8.3 and QSL9 Engines, Bulletin 4021518. |
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White smoke is present |
Refer to the Smoke, White – Excessive symptom tree. |
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Lubricating oil lines leak oil |
Check all oil lines and fittings for leaks. Tighten loose fittings and replace leaking oil lines if necessary. |
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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 Procedure 010-045. |
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Crankcase ventilation system is plugged |
Check and clean the crankcase breather and vent tube. Refer to Procedure 003-018. |
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Lubricating oil or fuel is entering the turbocharger |
Remove the intake and exhaust piping, and check for oil or fuel. |
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Air intake system restriction is above specification |
Check the air intake system for restriction. Clean or replace the air filter and inlet piping as necessary. Refer to Procedure 010-031. |
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Exhaust system restriction is not within specification |
Check the exhaust system for restrictions. Refer to Procedure 011-009. |
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Turbocharger oil seal is leaking |
Check the turbocharger compressor and turbine seals. Refer to Procedure 010-033. |
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Turbocharger wheel clearance is out of specification |
Check the radial bearing clearance and axial clearance. Inspect the turbocharger. Repair or replace the turbocharger if necessary. Refer to Procedure 010-033. |
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Worn piston rings |
Check for excessive blowby. Refer to Procedure 014-010. |
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Valve stem clearance is excessive or the valve stem seals are damaged |
Check the valve stems and seals. Refer to Procedures 002-004. |
