Generator is excessively loud or has new knocking/metallic noises during operation.

Safety first: If you hear loud knocking or metal-on-metal sounds, shut down the generator immediately to prevent catastrophic failure.

Steps:

• Visual inspection: With the engine off, inspect engine and alternator mounts for loose bolts or torn rubber isolators. Tighten or replace as needed.
• Exhaust system: Check the muffler, exhaust flex, and hangers for cracks or breaks that can cause rattling or increased noise.
• Coupling check: On units with a flexible coupling between engine and alternator, inspect for wear or misalignment.
• Internal engine noise: Persistent knocking often indicates internal engine damage and requires professional diagnosis and likely engine replacement.