Camshaft and Bearings Cleaning and Inspection

Tools Required: J 7872  Magnetic Base Indicator Set. See Special Tools .

Fig 1: Measure Camshaft Journals With Micrometer
Courtesy of GENERAL MOTORS CORP.
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.

Fig 2: Measuring Camshaft Runout
Courtesy 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.