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Home >> Pontiac >> 2007 >> Grand Prix GXP >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Mechanical - 3.8L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Camshaft and Bearings Cleaning and Inspection

Camshaft and Bearings Cleaning and Inspection

WARNING: This page is about a different variant/trim than selected.
Tools Required

J 7872  Magnetic Base Indicator Set. See Special Tools 

    Fig 1: Measure Camshaft Journals With Micrometer
    GM35212Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: The camshaft and lifters become mated to each other through both normal and premature wear. If the camshaft must be replaced, ALL lifters must be replaced as well.
  1. Measure the camshaft journals with a micrometer.

    If the camshaft journals are not within specifications, replace the camshaft. The measurement should be 47.655-46.858 mm (1.8462-1.8448 in). If the measurement is not within specifications the engine camshaft must be replaced.

    2. Fig 2: Measuring Camshaft Runout
    GM35211Courtesy of GENERAL MOTORS CORP.
  2. Measure the camshaft runout using J 7872  . See Special Tools .
    1. Mount the camshaft in V-blocks between centers.
    2. Use J 7872  to check the intermediate camshaft journal. See Special Tools .
  3. If the runout exceeds specifications, the camshaft is bent and should be replaced. If the camshaft journals are more than 0.025 mm (0.0010 in) out-of-round, then replace the engine camshaft.
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