Atlas Copco Abnormal Engine Knock

Generator produces unusual loud knocking or metallic noise from engine

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.

Possible Causes

Loose connecting rod or main bearings, Injector misfire, Incorrect fuel, Detonation due to timing issues

Safety first: If a loud metallic knock develops suddenly, stop the engine immediately to prevent catastrophic failure.

Check oil level and pressure: Low oil can cause bearing knock. Do not restart until corrected.
Listen at idle: Briefly run at idle (if safe) to localize the noise with a mechanic's stethoscope.
Verify fuel quality: Drain and replace contaminated or incorrect fuel.
Schedule professional diagnosis: Internal engine noises require expert assessment and likely disassembly.

Professional Required 5/5

Engine Long Block

Check Price on Amazon

We may earn a commission from links on this page.