Chevrolet Silverado / GMC Sierra. Service manual — part 453

Fig. 134: View Of Rocker Arm Components
Courtesy of GENERAL MOTORS CORP.

1. Lubricate the rocker arm shaft (7) and the inside of the rocker arms with clean engine oil, if

necessary.

2. Install the rocker arm bracket (12) and bolt (1) on one end of the rocker arm shaft, if

necessary.

3. Install the intake rocker arm (9), spring (10), exhaust rocker arm (11), and bracket (12)

with bolt (1). Continue in the same sequence to the last bracket, if necessary.

4. Push the bracket (12) to compress the springs and then install the bolt (1), if necessary.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Fig. 135: View Of Pushrods, Valve Spring Caps & Valve Lifter Bridges
Courtesy of GENERAL MOTORS CORP.

5. Lubricate the top of the valves, the valve bridge stem, the valve lifter bridge, and the valve

spring caps with clean engine oil.

6. Install the valve bridge.

7. Install the valve bridge pins.

8. Lubricate the valve lifter end of the pushrod with clean engine oil.

9. Install the pushrods.

To ensure the pushrod is properly installed, gently pull up on the pushrod. Resistance should

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

be felt from the pushrod trying to lift the valve lifter.

Fig. 136: View Of Rocker Arm Shaft
Courtesy of GENERAL MOTORS CORP.

NOTE:

The pushrods must be correctly seated in the valve lifter and
valve rocker arms before the rocker arm shaft assembly is
torqued into place. Improper seating of the pushrods can cause

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

10. Install the rocker arm shaft assembly.

Fig. 137: Rocker Arm Shaft Bolts Tightening Sequence
Courtesy of GENERAL MOTORS CORP.

damage to the pushrods or the valve rocker arm shaft
assembly components.

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado