Special Tools
J-7872 Magnetic Base Dial Indicator
For equivalent regional tools, refer to
Special Tools
- Remove and discard the camshaft position actuator filter (1).
- Clean the camshaft with cleaning solvent.
Warning: Refer to Cleaning Solvent Warning in the Preface section.
- 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 Magnetic Base Dial Indicator
.
5.1. | Mount the camshaft in V-blocks between the centers. |
5.2. | Use the
J-7872 Indicator
in order to measure the intermediate camshaft journal. |
- Measure the camshaft lobe lift using the
J-7872 Indicator
.
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 Indicator
in order to measure the lobe lift. |
- If the runout or lobe lift is not within specifications, replace the camshaft.
Note: 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).