Chevrolet Silverado / GMC Sierra. Manual - part 585
Fig. 27: Compressing Valve Spring Using J 8062
Courtesy of GENERAL MOTORS CORP.
6. Use the J 8062 to compress the valve spring.
7. Install the valve keys.
8. Remove the J 8062 from the cylinder head.
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 28: Measuring Valve Spring Installed Height
Courtesy of GENERAL MOTORS CORP.
9. Measure the valve installed height using a ruler. Measure from the base of the valve spring
to the top of the valve. Refer to Engine Mechanical Specifications .
10. Install the remaining valves, springs, and other components.
VALVE LIFTERS CLEANING AND INSPECTION
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 29: View Of Distance Between Bottom Of Roller & Roller Lifter Body
Courtesy of GENERAL MOTORS CORP.
1. Push the roller towards the roller lifter body and measure the distance between the bottom
of the roller and the roller lifter body. The production value is 0.989-1.0 mm (0.0389-
0.0394 in) and the service limit is 0.9 mm (0.0354 in).
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
2. Replace the valve lifter if the measurement exceeds the service limit.
3. Inspect the valve lifters for the following:
The valve lifter body for scuffing and wear
The valve lifter roller assembly for wear
The valve lifter roller for smooth rotation
VALVE ROCKER ARM AND SHAFT CLEANING AND INSPECTION
Fig. 30: Measuring Rocker Arm Shaft Outside Diameter
Courtesy of GENERAL MOTORS CORP.
1. Measure the rocker arm shaft outside diameter where the rocker arm is located. The
production value is 21.979-22.0 mm (0.8653-0.8661 in) and the service limit is 21.85 mm
(0.8602 in).
2008 Chevrolet Silverado 1500
2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado