Hummer H3. Manual — part 420

5. Using a suitable tapping wrench, tap the threads of the drilled hole.

M6 inserts require a minimum tap depth of 15 mm (0.59 in).

M8 inserts require a minimum tap depth of 20 mm (0.79 in).

M10 inserts require a minimum tap depth of 23.5 mm (0.93 in).

Fig. 507: Cleaning Out Metal Chips
Courtesy of GENERAL MOTORS CORP.

remove the tap and clean chips from the hole and the
flutes of the tap.

Ensure the tap has created full threads at least to the
depth equal to the insert length.

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

insert installation.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

6. Using compressed air, clean out any chips.

Fig. 508: Spraying Cleaner Into Tapped Hole
Courtesy of GENERAL MOTORS CORP.

7. Spray cleaner GM P/N 12377981 (Canadian P/N 10953463) or equivalent into the tapped

hole.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 509: Cleaning Out Metal Chips
Courtesy of GENERAL MOTORS CORP.

8. Using compressed air, clean out any chips.

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

insert installation.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 510: Lubricating Installer Tool Using Driver Oil
Courtesy of GENERAL MOTORS CORP.

9. Lubricate the threads of the driver installation tool (2) with the driver oil (1) J 42385-110.

IMPORTANT: Do not allow oil or other foreign material to contact the

outside diameter (OD) of the insert.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3