Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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The alternator bearings are sealed, and can not be lubed.
If a bearing goes bad, it needs to be replaced.
You said it sounded like it cam from the armature (alternator) end of the genset.
The alternator bearings are sealed.
But you are talking about the crankshaft main bearing? It is not at at the end of the genset. It is in the engine.
These bearings are pressure lubed by the oil pump. If they are not getting oil, there is a problem in the lubrication system.
But if this is just an intermittent noise, it is very doubtful that it is a lube issue.
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