Hummer H3. Manual — part 408

4. Inspect the valve lash adjusters for the following conditions:

Excessive wear

Clogging of the oil passage

Damage

Collapsed or spongy

CYLINDER HEAD DISASSEMBLE

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.

Disassembly Procedure

IMPORTANT: Keep the valve rocker arms and valve lash adjusters in the

order from where they where removed.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 463: Installing Spark Plugs
Courtesy of GENERAL MOTORS CORP.

1. Remove the spark plugs.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 464: View Of A.I.R. Injection Pipe Cover
Courtesy of GENERAL MOTORS CORP.

2. Remove the A.I.R. injection pipe cover studs.

3. Remove the A.I.R. injection pipe cover and gasket.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 465: Using J 8062 & J 42037 To Compress Valve Spring
Courtesy of GENERAL MOTORS CORP.

4. Use J 8062 (2) and EN 46119 (1) to compress the valve spring. See Special Tools.

IMPORTANT: Organize the valve train components when disassembling so

they can be reassembled in the same location and matched
up with the same components as previously installed.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3