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Vermonter
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C-40 said:
Cleaning the bearings requires flushing them. There are no seals on the inside. Using some mineral spirits and a brush might work OK, but a spray would be better. WD-40 or similar will work. A product like brake parts degreaser in a spray can is hard on the seals. I tried it once and it curdled the seals, but they returned to normal when the solvent evaporated.
Your comments interest me because I've been thinking of doing the same thing. My question, however, goes a little further. Should I pull the bearings to accomplish this or is it sufficient to do this while the bearings are attached to the joints on the crank arms?
 
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