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Measuring Crankshaft Bearing Clearances - Micrometer Method

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Measure the crankshaft journal diameter with a micrometer in several places, approximately 90 degrees apart. Average the measurements.
  2. Determine the taper and out-of-round of the journal. Refer to Engine Mechanical Specifications   .
  3. Install the bearings into the engine block or connecting rod assembly.
    Fig 1: Installing Bearings
    G01977826Courtesy of GENERAL MOTORS CORP.
  4. Install the bearing cap bolts and tighten to specifications. Refer to Fastener Tightening Specifications   .
  5. Measure the bearing inside diameter (ID) at two points 90 degrees apart. Average the measurements.
  6. In order to determine the bearing clearance, subtract the average journal diameter from the average bearing inside diameter.
  7. Compare the readings to specifications. Refer to Engine Mechanical Specifications  .
  8. Replace bearing halves as required to obtain the proper bearing clearances.
    Fig 2: Identifying Bearing Cap Bolts
    G01977827Courtesy of GENERAL MOTORS CORP.
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