Bearings

[Nat Penton]

Yesterday I replaced the rear bearing on a new 91FX installed on or about 7-06-04.Maybe 60 flts, API for stock bearings. Since the front bearing seldom needs replacing I feel the culprit is probably exhaust vapors causing the rapid 
deterioration? In another airplane I have over 600 flts on a 91FX with a sealed bearing. In changing the rear bearing I wonder if dropping a cold bearing into a hot case (350deg) could damage the rubber seals------                 
                                                                  Nat Penton
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