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.

Remove and discard the camshaft position actuator filter (1).
Clean the camshaft with cleaning solvent.

Fig 1: Identifying Camshaft Inspection Points

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 (5)
- Damaged camshaft lobes (4)
- Damaged camshaft position sensor reluctor area (3)
- Damaged threads (2)

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

Fig 4: Identifying Camshaft Inspection Points

Courtesy of GENERAL MOTORS CORP.

IMPORTANT: Always install a NEW camshaft position actuator filter anytime the camshaft position actuator is removed or installed.

Install a NEW camshaft position actuator filter (1).