Guardian Internal Engine Mechanical Noise

Unusual loud knocking, clanking, or metallic noise from engine during operation.

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

Connecting rod or main bearing wear, Loose flywheel, Broken valve train component, Detonation from incorrect fuel or timing

Safety first: Immediately place the controller in OFF and open the main breaker. Do not continue to run an engine with loud mechanical noise.

Visual inspection: Check for loose external components (heat shields, brackets, muffler) that may rattle.
Flywheel check: Inspect the flywheel and mounting hardware for looseness or damage.
Fuel quality: Verify correct fuel type and pressure to avoid detonation.
Professional teardown: Persistent knocking indicates internal damage; contact a Guardian technician for engine disassembly and repair.

Professional Required 5/5

Connecting Rod Bearing Set

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