Quote:
Originally Posted by SpEEdyBL
Well most motors have shielded bearings which have a tiny space that dust can get inside. I doesn't mean your bearings are compromised if that happens. Motor spray cleaner followed by re-oiling can do wonders for a gritty bearing.
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If bearing has dirt or grit inside and is not a rebuildable type, then it is compromised. While performance may be able to be improved it will not be the same. It's not worth the risk of an expensive motor to be cheap and not just replace the bearing.
As these bearings are, it would take a lot to get anything inside that would cause its performance to suffer, but when it does, it's over.