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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (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 variant/trim than selected.
    Fig 1: View Of Crankshaft Bearings At Engine Block
    GM334338Courtesy of GENERAL MOTORS CORP.
  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.
    4. Fig 2: Bearing Cap Bolts
    GM353070Courtesy 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.
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