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Fig. 484: Valve Stem Keys, Valve Spring Cap & Valve Spring 1. Clean the cylinder head valve spring shim area. 2. Install the valves (228) into the proper port. Refer to Separating Parts. IMPORTANT: When using the valves and related components again, install the parts to their original location.
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
3. Install the valve stem oil seal (222). 4. Install the valve spring (223). 5. Install the valve spring cap (224). Fig. 485: Compressing Valve Spring Using
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
6. Using the J 8062 , compress the valve spring. See Special Tools. 7. Install the valve stem keys. 1. Use grease in order to hold the keys in place and remove the J 8062 . See Special Tools. 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. 486: Measuring Valve Spring Installed Height 8. Using a ruler, measure the valve spring installed height.
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
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 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 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
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