Onan
Abnormal Mechanical Noise
Generator is excessively noisy during operation (mechanical knocking or rattling)
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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 or alternator mounting bolts, Worn engine mounts, Internal engine damage (rod knock), Loose exhaust components
How to Fix / Troubleshooting
Safety first: Keep clear of moving parts and hot surfaces. Disable auto-start before inspection.
- Inspect mounts: Check engine and alternator mounting bolts for tightness. Tighten to specified torque.
- Check vibration isolators: Inspect rubber engine mounts for cracking or collapse. Replace if deteriorated.
- Exhaust system: Inspect muffler, flex pipe, and hangers for looseness or broken supports. Tighten or replace as needed.
- Internal noise: If knocking persists and appears internal to the engine, shut down and have a technician evaluate for bearing or rod damage.
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Repair Difficulty
Hard
4/5
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