Generac
Abnormal mechanical noise
Generator is excessively loud or has unusual knocking or rattling noises during operation.
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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 or broken muffler, Internal engine damage (rod knock), Loose sheet metal or enclosure panels
How to Fix / Troubleshooting
Safety: Keep clear of moving parts and hot exhaust. Use hearing protection when working near a running generator.
- Inspect mounts: With the engine off, check engine mounting bolts and vibration isolators. Tighten or replace damaged mounts.
- Check exhaust system: Look for cracks in the muffler, loose exhaust manifold bolts, or broken hangers. Replace damaged exhaust components.
- Secure panels: Tighten all enclosure screws and latches. Add foam or rubber isolators where panels vibrate.
- Internal noise: Deep knocking or metallic clatter may indicate internal engine damage. Shut down and have a professional inspect the engine.
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Repair Difficulty
Medium
3/5
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