Chevrolet Silverado / GMC Sierra. Service manual — part 615

4. Install the rocker arm shaft assembly.

Fig. 134: Rocker Arm Shaft Bolt Tightening Sequence
Courtesy of GENERAL MOTORS CORP.

5. Install the rocker arm shaft assembly bolts.

Tighten: Tighten the rocker arm shaft assembly bolts in the proper sequence. Tighten the

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

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

rocker arm shaft bolts to 41 N.m (30 lb ft).

VALVE LASH ADJUSTMENT

Fig. 135: View Of Crankshaft Balancer Mark Aligned With Engine Mark
Courtesy of GENERAL MOTORS CORP.

1. Rotate the crankshaft to bring the number 1 cylinder at the top dead center of the

2008 Chevrolet Silverado 1500

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

compression stroke. The number 1 cylinder is the front cylinder on the right bank. The mark
on the crankshaft balancer should be aligned with the mark on the engine.

Fig. 136: View Of Feeler Gage Between Tip Of Rocker Arm & Valve Lifter Bridge
Courtesy of GENERAL MOTORS CORP.

2. Loosen the valve adjusting screws.

3. Insert a feeler gauge between the tip of the rocker arm and the valve bridge.

2008 Chevrolet Silverado 1500

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

Fig. 137: Identifying Valves To Adjust When #1 Cylinder Is At TDC Of
Compression Stroke
Courtesy of GENERAL MOTORS CORP.

4. Adjust the valve lash to 0.3 mm (0.012 in). Refer to Valve Clearance Adjustment

Specifications to determine which valves that can be adjusted when the engine is at Top

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

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