Hummer H2. Manual — part 1824

Fig. 472: Cylinder Head Components
Courtesy of GENERAL MOTORS CORP.

2004 Hummer H2

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

3. Remove the valve stem keys (225).

4. Remove the valve spring cap (224).

5. Remove the valve spring (223).

6. Remove the valves (227 and 228).

7. Remove the valve stem oil seal (222). Refer to Separating Parts .

Fig. 473: Cylinder Head Expansion Plugs
Courtesy of GENERAL MOTORS CORP.

8. Remove the cylinder head expansion plugs (226), if required.

2004 Hummer H2

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

Fig. 474: Coolant Temperature Sensor (Left Cylinder Head)
Courtesy of GENERAL MOTORS CORP.

9. Remove the coolant temperature sensor from the left cylinder head.

2004 Hummer H2

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

Fig. 475: Coolant Plug (Right Cylinder Head)
Courtesy of GENERAL MOTORS CORP.

10. Remove the coolant plug from the right cylinder head.

CYLINDER HEAD CLEANING AND INSPECTION

Tools Required

z

J 8089 Carbon Removal Brush

z

J 9666 Valve Spring Tester

2004 Hummer H2

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