Camshaft and Bearings Clean and Inspect

TOOLS REQUIRED
^ J 8001 Dial Indicator
^ J 26900-13 Dial Indicator Post




INSPECTION
1. Inspect the sprocket.
2. Inspect the keyway and the threads.
3. Inspect the bearing surfaces and the lobes for damage.
4. Replace the camshaft if the camshaft is damaged. Do not attempt to repair the camshaft.





5. Measure the bearing journal diameter with a micrometer. Diameter should be 47.45-47.48 mm (1.868-1.869 inches). Replace the camshaft if the bearing journals are out of specification.





6. Use the following procedure in order to measure camshaft lift:
a. Lubricate the camshaft bearings with GM Camshaft and Lifter Prelube P/N 1052365 or the equivalent.
b. Set the camshaft on "V" blocks or between camshaft centers.
c. Install the Dial Indicator. Install the Dial Indicator Post.
d. Measure the camshaft journal runout. Maximum runout is 0.025 mm (0.001 inches).
e. Measure the lobe lift. Lobe lift for intake and exhaust lobes should be 6.9263 mm (0.2727 inches). Replace the camshaft if the camshaft lift is out of specification.