Symptom Tree t048
| Cause | Correction |
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Engine is operating at low ambient temperature |
Check the winterfront, shutters, and under-the-hood air. Use under-the-hood intake air in cold weather. Refer to Cold Weather Operation, Bulletin 3387266. |
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Ether starting aid is malfunctioning |
Repair or replace the ether starting aids. Refer to the OEM service manual. |
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Fuel grade is not correct for the application or the fuel quality is poor |
Operate the engine from a tank of high-quality fuel. Refer to Procedure 018-002 (Fuel Recommendations and Specifications) in Section V of the Operation and Maintenance Manual, Signature and ISX, Bulletin 3666251 or the Operation and Maintenance Manual, Industrial and Power Generation, QSX15 Engines, Bulletin 3666423. |
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Air in the fuel system |
Check for air in the fuel system. Refer to Procedure 006-003 (Air in Fuel) in Section 6. |
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Vibration damper has failed |
Remove the vibration damper and operate the engine at the rpm where the noise normally occurs. If noise is still present, proceed to the next step. If the noise is eliminated, replace the vibration damper. Refer to Procedure 001-052 (Vibration Damper, Viscous) in Section 1. |
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Coolant temperature is below specification |
Refer to the Coolant Temperature Below Normal symptom tree. |
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Injector is malfunctioning |
Perform the single-cylinder cutout test. Replace the injectors as necessary. Refer to Procedure 006-026 (Injector) in Section 6. |
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Overhead adjustments are not correct |
Measure and adjust the overhead settings. Refer to Procedure 003-004 (Overhead Set) in Section 3. |
