Chevrolet Silverado / GMC Sierra. Service manual — part 451

1. Remove the upper right valve rocker arm cover. Refer to Valve Rocker Arm Cover

Replacement - Upper Right Side.

2. Remove the fuel injectors. Refer to Fuel Injector Replacement (Left) or Fuel Injector

Replacement (Right) .

3. Remove the lower valve rocker arm cover bolts.

4. Remove the lower valve rocker arm cover.

5. Remove the gasket from the lower valve rocker arm cover.

6. Inspect the lower valve rocker arm cover gasket for damage, replace if necessary. Otherwise

reuse the old gasket.

7. If required, clean and inspect the lower valve rocker arm cover. Refer to Valve Rocker

Arm Cover Cleaning and Inspection - Lower .

Installation Procedure

2008 Chevrolet Silverado 1500

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

Fig. 127: View Of Lower Valve Rocker Arm Cover (Right)
Courtesy of GENERAL MOTORS CORP.

1. Install the lower valve rocker arm cover gasket.

2. Install the lower valve rocker arm cover.

3. Install the lower valve rocker arm cover bolts.

2008 Chevrolet Silverado 1500

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

Fig. 128: Lower Valve Rocker Arm Cover Bolts Tightening Sequence
Courtesy of GENERAL MOTORS CORP.

4. Tighten the bolts in the sequence shown.

Tighten: Tighten the bolts to 10 N.m (89 lb in).

5. Install the fuel injectors. Refer to Fuel Injector Replacement (Left) or Fuel Injector

Replacement (Right) .

6. Install the right upper valve rocker arm cover. Refer to Valve Rocker Arm Cover

Replacement - Upper Right Side.

VALVE ROCKER ARM, SHAFT, AND PUSH ROD REPLACEMENT

Removal Procedure

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

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

Fig. 129: View Of Valve Clearance Adjusting Screw
Courtesy of GENERAL MOTORS CORP.

1. Remove the lower valve rocker arm covers. Refer to Valve Rocker Arm Cover

Replacement - Lower Left Side or Valve Rocker Arm Cover Replacement - Lower
Right Side.

2. Loosen the valve clearance lock nuts on each rocker arm.

3. Loosen the valve clearance adjusting screw on each rocker arm in order to relieve tension

on the valvetrain.

2008 Chevrolet Silverado 1500

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