Chevrolet Silverado / GMC Sierra. Service manual — part 363

Fig. 459: Inspecting CMP Actuator For Broken Spring
Courtesy of GENERAL MOTORS CORP.

2. Clean the CMP actuator with cleaning solvent.

3. Dry the components with compressed air.

4. Inspect the CMP actuator for a broken spring (1).

CAUTION: Refer to Safety Glasses and Compressed Air Caution .

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 460: CMP Actuator Inspection Points
Courtesy of GENERAL MOTORS CORP.

5. Inspect the CMP actuator for the following conditions:

Improper positioning of the CMP reluctor wheel. The actuator return spring should
reposition the reluctor wheel to the PARK position. Inspect for proper alignment of
the mark on the face of the sprocket (1) with the flat edge of the reluctor wheel (2). If
the reluctor wheel is not properly positioned, the internal components of the actuator
are sticking or the return spring is broken and the actuator should be replaced as an
assembly.

Nicked or damaged edges (3) on the CMP reluctor wheel

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Damaged timing chain teeth (4)

Fig. 461: View Of Oil Passages
Courtesy of GENERAL MOTORS CORP.

6. Inspect the CMP actuator for dirt, debris, or restrictions within the oil passages (1, 2, 3).

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 462: Timing Chain Tensioner Inspection Points
Courtesy of GENERAL MOTORS CORP.

7. Inspect the timing chain tensioner for the following conditions:

Damaged or broken tension spring (1)

Excessive wear or scoring on the chain guide surfaces (2, 3)

CAMSHAFT POSITION ACTUATOR MAGNET CLEANING AND INSPECTION

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2