Hummer H3. Manual — part 423

counterbore (2) of the drilled/tapped hole.

Fig. 519: View Of Stop Collar & Counterbore Drill
Courtesy of GENERAL MOTORS CORP.

1. Install a stop collar (2) on the counterbore drill (1), if required.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 520: Drilling Out Threads Of Damaged Hole
Courtesy of GENERAL MOTORS CORP.

IMPORTANT:

During the drilling process, it is necessary to repeatedly
remove the drill and clean chips from the hole and the
flutes of the drill.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

2. Drill out the threads of the damaged hole.

Fig. 521: Cleaning Out Metal Chips
Courtesy of GENERAL MOTORS CORP.

3. Using compressed air, clean out any chips.

Drill the hole until the stop collar contacts the surface of
the base material.

IMPORTANT: All chips must be removed from the drilled hole prior to

tapping.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 522: Tapping Threads Of Drilled Hole
Courtesy of GENERAL MOTORS CORP.

IMPORTANT:

During the tapping process, it is necessary to repeatedly

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3