Symptom Tree t048
| Cause | Correction |
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When troubleshooting engine noise complaints, make sure the engine accessories (air compressor, fan clutch, freon compressor, or hydraulic pump) are not the cause of the noise. Refer to Engine Noise Diagnostic Procedures – General Information at the end of Section TS before using this symptom tree.
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Intake manifold air temperature is above specification |
Refer to Section 10 for specifications. |
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Coolant temperature is above specification |
Refer to the Coolant Temperature Above Normal – Gradual Overheat or the Coolant Temperature Above Normal – Sudden Overheat symptom tree. |
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Spark plug(s) malfunctioning |
Remove spark plugs and inspect. Refer to Procedure 013-016. |
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Coil wire malfunctioning |
Remove wire from engine and use a digital multimeter to measure resistance across the wire. Refer to Procedure 013-012. |
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Ignition coil malfunctioning |
Check the ignition coil. Refer to Procedure 013-012. |
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Ignition system harness connector pins bent or damaged |
Inspect harness. Refer to Procedure 019-196 in the Troubleshooting and Repair Manual, Fuel Systems and Electronics, B5.9G, C8.3G, L10G-III, Bulletin 3666118. |
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Overhead adjustments are not correct |
Measure and adjust the overhead settings. Refer to Procedure 003-004. |
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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 Fuels for Cummins Engines, Bulletin 3379001. |
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Excessive oil consumption |
Refer to the Lubricating Oil Consumption Excessive symptom tree. |
