For 1990-2009 cars

#### Tools Required

• | J 8001 Dial Indicator

• | J 26900-13 Dial Indicator Post

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 journals with a micrometer. Measure the diameter. Measure valve run-out.

Replace the camshaft if the bearing journals are out of specification.

6. Use the following procedure in order to measure camshaft lift:

6.1. | Lubricate the camshaft bearings with GM Camshaft and Lifter Prelube P/N 1052365 or the equivalent.

6.2. | Set the camshaft on "V" blocks or between camshaft centers.

6.3. | Install the J 8001 .

Install the J 26900-13 .

6.4. | Measure the camshaft journal run-out. Measure the lobe lift. Replace the camshaft if the camshaft lift is out of specification.