Hummer H3. Manual - part 412

1. Lift the valve off the valve seat.

2. Apply a dab of blue dye to the valve face.

3. Seat and rotate the valve. The blue dye traces transferred to the valve seat are an

indication of concentricity of the valve seat.

13. Use the following procedure to measure the valve runout:

1. Clean off the blue dye.

2. Apply blue dye to the valve seat.

3. Seat and rotate the valve.

4. The traces of blue dye transferred to the valve indicates valve runout.

14. Replace the head if the valve seats are damaged.

15. Inspect the valves for the following damage:

Grooving (1, 2)

Bent valve stem (3). Replace any bent valve.

Burrs or scratches (4). Minor burrs or scratches may be removed with a fine oil stone.

Chipped or worn key grooves (5). Replace if damaged.

Valve tip wear (6). Replace if worn.

CYLINDER HEAD ASSEMBLE

Tools Required

EN 46119 Off-Vehicle Valve Spring Compressor Adapter. See Special Tools.

J 8062 Valve Spring Compressor. See Special Tools.

J 38820 Valve Stem Seal Remover/Installer. See Special Tools.

Assembly Procedure

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 477: Locating Oil Gallery Plugs
Courtesy of GENERAL MOTORS CORP.

1. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads.

2. Install the (end) oil gallery plugs.

Tighten: Tighten the oil gallery plugs to 38 N.m (28 lb ft).

NOTE:

Refer to FASTENER NOTICE .

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 478: View Of Inner Oil Gallery Plug
Courtesy of GENERAL MOTORS CORP.

3. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the plugs.

4. Install the (inner) oil gallery plugs.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 479: View Of Water Jacket Plug
Courtesy of GENERAL MOTORS CORP.

5. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the plug.

6. Install the water jacket plug.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3