Cleaning and Inspection Procedure

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

Clean the camshaft with cleaning solvent.

Fig 1: Inspecting Camshaft

Courtesy of GENERAL MOTORS CORP.

CAUTION: Refer to Cleaning Solvent Caution in Cautions and Notices.

Inspect the camshaft for the following conditions:
- Scored camshaft bearing journals (1)
- Damaged camshaft lobes (2)
- Damaged camshaft sprocket locator pins (3)
- Damaged threads (4)
- Damage to the camshaft reluctor tooth (5)

Fig 2: Measure Camshaft Journals With Micrometer

Courtesy of GENERAL MOTORS CORP.

Measure the camshaft journals using a micrometer.
If the camshaft journals are not within specifications, replace the camshaft.

Fig 3: Measuring Camshaft With J 7872

Courtesy of GENERAL MOTORS CORP.

Measure the camshaft runout using the J 7872 . See Special Tools and Equipment .
1. Mount the camshaft in V-blocks between the centers.
2. Use the J 7872 in order to measure the intermediate camshaft journal. See Special Tools and Equipment .
Measure the camshaft lobe lift using the J 7872 . See Special Tools and Equipment .
1. Lubricate the camshaft using GM P/N United States 12345501, GM P/N Canada 992704 or the equivalent.
2. Set the camshaft on V-blocks.
3. Use the J 7872 in order to measure the lobe lift. See Special Tools and Equipment .
If the runout or lobe lift is not within specifications, replace the camshaft.