Chevrolet Silverado / GMC Sierra. Service manual — part 264

Fig. 104: View Of Cylinder Head Components
Courtesy of GENERAL MOTORS CORP.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

10. Remove the valve stem keys (225).

11. Carefully release the valve spring tension.

12. Remove the J 38606 . See Special Tools.

13. Remove the valve spring cap (224).

14. Remove the valve spring (223).

15. Remove the valve stem oil seal and shim (222) assembly.

Installation Procedure

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 105: View Of Cylinder Head Components
Courtesy of GENERAL MOTORS CORP.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

1. Clean the cylinder head valve spring seat and/or shim area.

2. Lubricate the valve guide and valve stem oil seal with clean engine oil.

3. Install the valve stem oil seal and shim (222) assembly.

4. Install the valve spring (223).

5. Install the valve spring cap (224).

Fig. 106: Compressing Valve Spring (Cylinder Head Installed) Using Special Tools
Courtesy of GENERAL MOTORS CORP.

6. Compress the valve spring using the J 38606 . See Special Tools.

7. Install the valve stem keys (225).

Use grease in order to hold the valve keys in place.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2