Hummer H2. Manual — part 1726

10. Remove the valve stem keys (225).

11. Carefully release the valve spring tension.

12. Remove the J 38606 . See Special Tools and Equipment .

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

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

Fig. 106: Cylinder Head Components
Courtesy of GENERAL MOTORS CORP.

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer 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. 107: Using J 38606 & J 5892-D To Remove Valve Spring
Courtesy of GENERAL MOTORS CORP.

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

7. Install the valve stem keys (225).

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

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Make sure the keys seat properly in the groove of the valve stem.

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

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Carefully release the valve spring pressure, making sure the valve keys stay in place.

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Remove the J 38606 . See Special Tools and Equipment .

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Tap the end of the valve stem with a plastic faced hammer to seat the keys (if necessary).

Fig. 108: Removing J 22794 From Spark Plug Port
Courtesy of GENERAL MOTORS CORP.

8. Remove J 22794 from the spark plug port. See Special Tools and Equipment .

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2