Chevrolet Silverado / GMC Sierra. Service manual — part 2133

2. Dry the components with compressed air.

3. Inspect the timing chain (1) for binding or wear.

4. Inspect the camshaft position (CMP) sensor raised areas (2) for nicks or damage.

5. Inspect for worn, damaged, or chipped teeth (3).

6. Inspect for a damaged keyway (4).

7. Inspect for worn oil pump drive splines (5).

Fig. 73: View Of Timing Chain Tensioner Inspection Points
Courtesy of GENERAL MOTORS CORP.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

8. 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 CLEANING AND INSPECTION

CAUTION: Refer to Camshaft Position Actuator Removal and Installation

Caution .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

Fig. 74: View Of Tie Strap Through Center Of Actuator
Courtesy of GENERAL MOTORS CORP.

1. Insert a tie strap (1) through the center of the camshaft position (CMP) actuator and over the

reluctor wheel.

Fig. 75: Inspecting CMP Actuator For Broken Spring
Courtesy of GENERAL MOTORS CORP.

2. Clean the CMP actuator with cleaning solvent.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado

3. Dry the components with compressed air.

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

Fig. 76: 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

CAUTION: Refer to Safety Glasses and Compressed Air Caution .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L - Cab & Chassis Sierra, Cab & Chassis Silverado,

Sierra & Silverado