Chevrolet Silverado / GMC Sierra. Service manual — part 2136

Fig. 84: Identifying Valve Rocker Arm Components
Courtesy of GENERAL MOTORS CORP.

1. Mark, sort, or organize the components for assembly. Refer to Separating Parts .

2. Clean the components with cleaning solvent.

IMPORTANT: Parts that are to be used again must be marked, sorted or

organized for assembly.

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 valve rocker arms bearings (2) for binding or roughness.

5. Inspect the valve rocker arm pushrod sockets (3) and valve stem mating surfaces (1). These

surfaces should be smooth with no scoring or exceptional wear.

6. Inspect the pushrods for worn or scored ends. These surfaces should be smooth with no

scoring or exceptional wear.

7. Inspect the pushrods for bends. Roll the pushrod on a flat surface to determine if the pushrod

is bent.

8. Inspect the pushrod oil passages for restrictions.

9. Inspect the rocker arm pivot supports for cracks, wear, or other damage.

VALVE LIFTERS AND GUIDES CLEANING AND INSPECTION (RPO LY2/LY6/L92)

Valve Lifters

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

Fig. 85: Inspecting Areas Of Valve Lifters
Courtesy of GENERAL MOTORS CORP.

1. Clean the components in cleaning solvent.

IMPORTANT: Components that are to be used again must be marked,

sorted or organized for assembly.

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

2. Dry the components with compressed air.

3. Inspect the valve lifters for the following conditions:

Bent or broken clip (1)

Worn pushrod socket (2)

Scuffed or worn sides (3)

If the valve lifter shows wear, inspect the engine block lifter bores for wear or
damage.

Flat spots on the roller (4)

Loose or damaged pin (5)

Plugged oil hole (6)

Worn or damaged roller bearing

The roller should rotate freely with no binding or roughness.

Valve Guides

Inspect the valve lifter guides for the following conditions:

Cracks or damage

Excessive wear in the lifter mounting bores

VALVE LIFTERS AND GUIDES CLEANING AND INSPECTION (RPO LH6/L
LH6/LMG/LY5/LC9/L76)

Non Active Fuel Management Valve Lifters

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