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I have seen this many times, specially when trying to prolong clutch releasing bearings when no replacement is available. Bearings like those can't be easily re-greased, like tapper rollers for instance. The procedure I have seen is by heating grease in a can, enough to soft it but not to completely liquefy it, then toss the bearing, stir, push the grease into the grooves, etc. and then let everything get normal temperature. It is said that it effectively puts grease "up to the most obscure corners" inside a bearing. They call this "cook the bearing". My question is: how would doing this affects the grease function in real world, not in theory?

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    Aren't clutch bearings supposed to be sealed so that grease doesn't get flung onto the clutch plate? – GdD Nov 15 '18 at 8:52
  • I guess no: when they sound funny you can silence them by spraying WD40 for instance, although that would last little like a few weeks before start to make noise again. I have disassembled ones that contains no retainers or seals... – Aram Alvarez Nov 15 '18 at 14:08
  • What about some spray lithium grease @AramAlvarez? Not a grease gun, but a spray can with a straw applicator? I use that for those hard to reach places where taking things apart is a pain. – GdD Nov 15 '18 at 14:15
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The effects will be heavily dependant on the type of grease being heated so this is not a question that can be answered.

Usually bearings like that are filled by pressure from one side.

I have always had success by squirting in gease with a grease gun and rotating, then repeating squirting and rotating until the bearing was as full as possible. Worked fine on both small 1” bearings and saw engineers doing exactly the same with bearings of 15” diameter.

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