Tools Required
J 7872
Magnetic Base Dial Indicator
- Remove and discard the camshaft position actuator filter (1).
- Clean the camshaft with cleaning solvent.
Caution: Bodily injury may occur if the cleaning solvent is inhaled or exposed
to the skin.
- Inspect the camshaft for the following conditions:
• | Scored camshaft bearing journals (5) |
• | Damaged camshaft lobes (4) |
• | Damaged camshaft position sensor reluctor area (3) |
- Measure the camshaft journals using a micrometer.
If the camshaft journals are not within specifications, replace the camshaft.
- Measure the camshaft runout using the
J 7872
.
5.1. | Mount the camshaft in V-blocks between the centers. |
5.2. | Use the
J 7872
in order to measure the intermediate camshaft journal. |
- Measure the camshaft lobe lift using the
J 7872
.
6.1. | Lubricate the camshaft using GM P/N 12345501 (Canadian P/N 992704) or the equivalent. |
6.2. | Set the camshaft on V-blocks. |
6.3. | Use the
J 7872
in order to measure the lobe lift. |
- If the runout or lobe lift is not within specifications, replace the camshaft.
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).