Hummer H3. Manual — part 205

Fig. 444: View Of Water Jacket Plug
Courtesy of GENERAL MOTORS CORP.

10. Inspect the water jacket plug, for leakage. Replace if necessary.

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3

Fig. 445: View Of Inner Oil Gallery Plug
Courtesy of GENERAL MOTORS CORP.

11. Inspect the (inner) oil gallery plug, for leakage. Replace if necessary.

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3

Fig. 446: Oil Gallery Plugs
Courtesy of GENERAL MOTORS CORP.

12. Inspect the (end) oil gallery plugs, for leakage. Replace if necessary.

CYLINDER HEAD CLEANING AND INSPECTION

Tools Required

J 9666 Valve Spring Tester

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3

Fig. 447: View Of Cylinder Head Gasket
Courtesy of GENERAL MOTORS CORP.

1. Inspect the cylinder head gasket and the mating surface. Inspect for leaks, corrosion, and

blowby.

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3