DuroMax
Internal Engine Knock / Mechanical Damage
Generator produces loud knocking or banging noise from engine
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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
Low oil level causing bearing damage, Connecting rod or piston slap, Loose flywheel, Detonation from incorrect fuel
How to Fix / Troubleshooting
Safety first: Immediately shut down the generator and disconnect battery negative. Do not restart until the cause is identified.
- Check oil level: Verify oil level on the dipstick. If low, top up, but be aware that damage may already have occurred.
- Inspect flywheel: Remove the flywheel cover and ensure the flywheel nut is tight and the key is intact.
- Fuel quality: Confirm you are using the correct fuel type and octane as specified by DuroMax.
- Professional inspection: Persistent knocking usually indicates internal engine damage (rod bearing, piston). Continued operation can lead to catastrophic failure. Have a qualified engine technician disassemble and inspect the engine.
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Repair Difficulty
Professional Required
5/5
Required Part
Engine Short Block
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