Hummer H3. Manual — part 402

Fig. 441: Cylinder Liner Trimming Tools View (1 Of 2)
Courtesy of GENERAL MOTORS CORP.

EN 45680-865 Debris Collector (3)

EN 45680-411 Trim Tool Assembly (2)

EN 45680-499 Updated Trimmer Pilot (white in color)

Air Control Valve (1 - Part of EN 45680-411

Drill Motor with 1/2 inch chuck, 1 1/8 hp, 7 amps, triple gear reduction and a 450-600
RPM rotational speed in a clockwise direction

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 442: Cylinder Liner Trimming Tools View (2 Of 2)
Courtesy of GENERAL MOTORS CORP.

Trim Tool Preloader (1)

EN 45680-412 Set Gage Ring (2)

EN 45680-413 Metal Shavings Catch Plug (3)

EN 45680-866 Drive Adapter (4)

EN 45680-414 Bolts (5)

NOTE:

Do not bore or hone the cylinder bore sleeve. The cylinder bore
sleeve inside diameter (I.D) is fully machined and honed to size
and is optimally finished as shipped. Any attempt to modify
this factory-produced sizing and finish with additional boring
and honing will lead to engine damage, excessive noise or
abnormal oil consumption.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 443: Placing Metal Shaving Catch Plug Into Cylinder Bore Sleeve
Courtesy of GENERAL MOTORS CORP.

1. After installing the NEW cylinder bore sleeve(s) into the engine block, trim the excess

material from the cylinder bore sleeve flange.

2. Place metal shaving catch plug EN 45680-413 into the cylinder bore sleeve to be trimmed.

Position the top of the EN 45680-413 approximately 3.0 mm (0.12 in) below the top

NOTE:

Ensure that all the metal particles are collected in order to
prevent internal damage to the transaxle or bearings.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

surface of the cylinder bore sleeve.

3. Place additional metal shaving catch plugs EN 45680-413 into all remaining cylinder bore

sleeves.

Fig. 444: Identifying Catch Plug Positioning
Courtesy of GENERAL MOTORS CORP.

NOTE:

Installing the metal shaving catch plug deeper than the
recommended depth will create a decrease in vacuum system
performance. A decrease in vacuum system performance will
cause metal shavings to enter the engine and cause engine

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3