Hummer H2. Manual — part 1849

Fig. 563: Tap Upper & Lower Marks, Fixture Plate Bushing
Courtesy of GENERAL MOTORS CORP.

11. In order to tap the new threads to the proper depth, rotate the tap into the hole until the marks (1 or 4) on

the tap align with the top of the drill bushing (3).

For the deeper cylinder head bolt holes, rotate the tap until the upper mark on the tap (4) aligns with the
top of the drill bushing.

For the shallower cylinder head bolt holes, rotate the tap until the lower mark on the tap (1) aligns with

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

the top of the drill bushing.

12. Remove the fixture plate (2), bushing (3), and bolts.

13. Using compressed air, clean out any chips.

14. Spray cleaner GM P/N 12346139 (Canadian P/N 10953463), GM P/N 12377981 (Canadian P/N

10953463) or equivalent into the hole.

15. Using compressed air, clean any cutting oil and chips out of the hole.

Fig. 564: Lubricating Installer Tool Using Driver Oil
Courtesy of GENERAL MOTORS CORP.

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

(OD) of the insert.

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

16. Lubricate the threads of the installer tool (2) with the driver oil (1).

Fig. 565: Bushing Type Insert & Driver Tool
Courtesy of GENERAL MOTORS CORP.

17. Install the insert (2) onto the driver tool (1).

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

Fig. 566: Applying Threadlock To Insert OD Threads
Courtesy of GENERAL MOTORS CORP.

18. Apply threadlock LOCTITE(tm) 277, J 42385-109 (1), or equivalent to the insert OD threads (2).

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2