Hummer H3. Manual — part 410

Fig. 470: View Of Water Jacket Plug
Courtesy of GENERAL MOTORS CORP.

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

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 471: View Of Inner Oil Gallery Plug
Courtesy of GENERAL MOTORS CORP.

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

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 472: Locating 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

Cleaning and Inspection procedure

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 473: 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.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3