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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1618 (Engine Mechanical - 4.3L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Crankshaft and Bearings Cleaning and Inspection >> Measuring Crankshaft Bearing Clearances-Micrometer Method

Measuring Crankshaft Bearing Clearances-Micrometer Method

WARNING: This page is about a different car, the 2003 GMC Sierra and 2003 Chevrolet Silverado. 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.
    Fig 1: Measuring Crankshaft Journal Diameter
    G02106227Courtesy of GENERAL MOTORS CORP.
  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 2: Install Bearings
    G02106228Courtesy 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 3: Installing Bearing Cap Bolts
    G02106229Courtesy of GENERAL MOTORS CORP.
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