Crankshaft Bearing Inspection Procedure

IMPORTANT: The following bearing wear conditions should be use to diagnose engine operating conditions or root cause of a condition. However, all connecting rod and main journal bearings that have been used in a running engine MUST be replaced. NEVER re-use the crankshaft or connecting rod bearings.





1. Inspect the main bearings for fatigue indicated by craters or pockets. Flattened sections on the bearing halves also indicate fatigue.





2. Inspect the main bearings for excessive scoring or discoloration on both front and back of the bearing halves.
3. Inspect the main bearings for dirt imbedded into the bearing material.





4. Inspect the main bearings for improper seating indicated by bright, polished sections.