Cummins
Abnormal Engine Noise
Generator is excessively noisy or has unusual knocking sounds
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Loose engine mounts, Exhaust leak at manifold or flex joint, Internal engine wear (rod knock, piston slap), Injector misfire
How to Fix / Troubleshooting
Safety first: Keep clear of moving parts and hot exhaust. Disable automatic start before inspecting.
- Visual inspection: Check engine mounting bolts and vibration isolators for looseness or damage. Tighten or replace as needed.
- Exhaust system: Look for soot marks or leaks at the exhaust manifold, turbo flange, and flex pipe. Replace gaskets or damaged sections.
- Listen to engine: Identify whether noise is from the top end, bottom end, or accessories. Knocking that changes with load may indicate injector or internal issues.
- Service: Persistent knocking or metallic noises should be evaluated by a Cummins technician to prevent catastrophic failure.
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Repair Difficulty
Hard
4/5
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