Cleaning & Inspection Procedure

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. 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 .
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 .
Measure the camshaft lobe lift using the J 7872 . See Special Tools .
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 .
If the runout or lobe lift is not within specifications, replace the camshaft.