Chevrolet Silverado / GMC Sierra. Service manual — part 383

2. Install the fixture plate (3), bolts (1), and bushing (2) onto the engine block deck.

Position the fixture plate and bushing over the hole that is to be repaired (4).

Fig. 523: View Of Alignment Pin & Fixture Retaining Bolts
Courtesy of GENERAL MOTORS CORP.

3. Position the alignment pin (1) through the bushing and into the hole.

The tool kits are designed for use with either a suitable
tap wrench or drill motor.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

4. With the alignment pin in the desired hole, tighten the fixture retaining bolts (2).

5. Remove the alignment pin from the hole.

Fig. 524: View Of Stop Collar & Counterbore Drill
Courtesy of GENERAL MOTORS CORP.

6. Install the sleeve (2) onto the drill (1).

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 525: Drilling Cylinder Head Bolt Hole
Courtesy of GENERAL MOTORS CORP.

7. Drill out the threads of the damaged hole.

Drill the hole until the stop collar of the drill bit or the sleeve contacts the bushing.

8. Using compressed air, clean out any chips.

IMPORTANT: During the reaming process, it is necessary to repeatedly

remove the drill and clean the chips from the hole.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 526: Tapping Threads Of Drilled Hole Using Tapping Wrench
Courtesy of GENERAL MOTORS CORP.

9. Using a tap wrench, tap the threads of the drilled hole.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2