Champion Internal Engine Mechanical Knock

Generator runs but produces a loud knocking or metallic banging noise

Advertisements

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.

Advertisements

Possible Causes

Low engine oil level, connecting rod or crankshaft bearing wear, loose flywheel, detonation from incorrect fuel

How to Fix / Troubleshooting

Safety first: Immediately set the controller to OFF and open the generator AC breaker if you hear loud knocking. Do not continue to run the engine.

  • Check oil level: After the engine cools, verify oil level and top up if low. If oil is very low or contaminated with metal, do not restart.
  • Inspect flywheel: With the engine off and battery disconnected, remove the flywheel cover and ensure the flywheel nut is tight and the key is not sheared.
  • Listen on restart (brief): If oil level is correct and no obvious issues are found, a brief restart may confirm if the knock persists. Shut down immediately if it does.

Internal engine knocks usually indicate serious damage and require engine teardown or replacement by a qualified technician.

Advertisements

Repair Difficulty

Professional Required 5/5

Required Part

Engine Assembly
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements