Chevrolet Silverado / GMC Sierra. Manual — part 2143

6. Using the J 8062 , compress the valve spring.

7. Install the valve stem keys.

1. Use grease in order to hold the keys in place and remove the J 8062 .

2. Ensure the keys seat properly in the groove of the valve stem.

3. Tap the end of the valve stem with a plastic face hammer to seat the keys, if necessary.

Fig. 104: Measuring Valve Spring Installed Height
Courtesy of GENERAL MOTORS CORP.

8. Using a ruler, measure the valve spring installed height.

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

Measure from the base of the valve spring to the top of the valve spring.

Specification:

If the installed height exceeds 46.25 mm (1.82 in), install a valve spring shim of
approximately 0.5 mm (0.02 in) thick.

Do not shim the valve spring to obtain less than the specified height.

Do not assemble the components without a spring shim on the cylinder head.

9. Install the remaining valves, springs, and other components.

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