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Home >> Pontiac >> 2002 >> Aztek AWD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical (Unit Repair) >> Repair Instructions >> Bearing Selection >> Method A

Method A

IMPORTANT: Do not mix inserts of different nominal size in the same bearing bore.
  1. Measure the crankshaft bearing journal diameter with a micrometer in several places, 90 degrees apart. Average the measurements.
  2. Measure the crankshaft bearing journal taper and runout.
  3. Install the crankshaft bearing inserts. Tighten the bearing cap bolts to specification using J 36660-A. 
  4. Measure the connecting rod inside diameter in the same direction as the length of the rod with an inside micrometer.
  5. Measure the crankshaft main bearing inside diameter with an inside micrometer.
  6. Select a set of bearing inserts that will produce the desired clearance.
  7. If the specified clearances cannot be met, the crankshaft journals must be reconditioned and undersized bearing inserts installed.
    Fig 1: Measuring Bearing Clearances (Method A - Micrometer)
    G01745541Courtesy of GENERAL MOTORS CORP.
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