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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 144 (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 Savana and 2003 Chevrolet Chevy Express. 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 Into Engine Block Or Connecting Rod Assembly
    G02078073Courtesy 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: Installing Bearing Cap Bolts & Bearing Halves
    G02078074Courtesy of GENERAL MOTORS CORP.
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