paragonbuilder
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When I was starting out in the marine engine fitter trade we were taught to feel for bearing problems. If the bearing was small enough to stick one finger in the shaft hole and spin the bearing outer shell any defect can be felt. The experienced hands called this feeling, a hitch, which is the moment any troublesome spot would make contact with the inner or outer races. They had brand new bearings and used ones that were problematic all mixed in with good bearings, our chore was to find the bad ones, after many hours of working them over one developed a feel for a bad bearing, even just one flat spot on a ball will be detectable with time and patience, every bearing,new or used gets a 4 - 5 min test before I use it. I failed a 250 lb, 6" dia shaft size ball bearing just this week, it has a bad spot in it and will be returned.
Is this done with no oil? Obviously debris could cause a hitch, so blast it out with brake cleaner?
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