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Main & Connecting Rod Bearings: Inspection

  1. Using a micrometer, measure diameter of connecting rod and main journals. If wear is more than 0.002" (0.051 mm) at any journal, crankshaft must be ground to fit 0.010" (0.25 mm) 0.020" (0.50 mm) or 0.030" (0.75 mm) undersize bearings.
  2. Using a dial indicator, check crankshaft for out-of-round. Maximum allowable out-of-round is 0.0012" (0.030 mm).
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