Hummer H3. Manual — part 403

4. Ensure that the metal shaving catch plug EN 45680-413 is 3.0 mm (0.12 in) below the top

surface of the cylinder bore sleeve.

Fig. 445: Identifying Set Gauge Ring Groove
Courtesy of GENERAL MOTORS CORP.

failure.

NOTE:

Installing the metal shaving catch plug above the
recommended depth will cause damage to the metal shaving
catch plug.

IMPORTANT: Before using trim tool assembly EN 45680-411, the height of

the cutting blades must be set to the proper specification.
The proper specification is that the cylinder bore sleeve
flange must be flush to +0.02 mm (0.0008 in) above the block

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

5. The groove side of the set gage ring EN 45680-412 (1) should be positioned upward on a

flat surface.

Fig. 446: View Of Trim Tool Assembly Components And Positioning
Courtesy of GENERAL MOTORS CORP.

deck surface.

IMPORTANT: Ensure that the set gage ring EN 45680-412 surfaces are

clean.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

6. Carefully position trim tool assembly EN 45680-411 onto the set gage ring EN 45680-412.

7. Loosen the shaft collar screw (2).

8. Push the shaft collar (2) downward using the trim tool preloader (1) until the shaft collar is

positioned against the top of the flange bearing (3).

9. Apply downward pressure on the collar and inner drive shaft using the trim tool preloader

(1), then tighten the shaft collar screw.

Tighten: Tighten the shaft collar screw to 19 N.m (14 lb ft).

IMPORTANT: Once this procedure is done, it is not necessary to reset the

trim tool assembly EN 45680-411 height until the blades are
worn or damaged.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 447: Trim Tool Assembly Alignment
Courtesy of GENERAL MOTORS CORP.

10. Place trim tool assembly EN 45680-411 onto the cylinder to be trimmed with the

directional arrow (1) pointing in line with the crankshaft centerline and the front of the
block.

11. Install the 4 bolts EN 45680-414 (2) into the cylinder head bolt holes in the block.

Tighten: Tighten the bolts to 20 N.m (15 lb ft).

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3