Hummer H3. Manual — part 417

Fig. 495: Checking Exhaust Manifold Mating Surface For Flatness
Courtesy of GENERAL MOTORS CORP.

4. Check the exhaust manifold mating surface for flatness. Use a straight edge and a feeler

gage.

5. Replace the exhaust manifold if necessary.

WATER PUMP CLEANING AND INSPECTION

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 496: View Of Water Pump
Courtesy of GENERAL MOTORS CORP.

1. Remove all sealing material from the sealing surface.

2. Inspect the water pump impeller for damage.

3. Inspect the water pump shaft for looseness.

4. Inspect the threads for damage.

5. Replace the water pump if necessary.

THREAD REPAIR

Tools Required

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

J 42385-400 Thread Repair Kit. See Special Tools.

J 43965 Extension Kit. See Special Tools.

The thread repair process involves a solid, thin walled, self-locking, carbon steel, bushing type
insert. During the insert installation process, the installation driver tool cold-rolls the bottom
internal threads and expands the bottom external threads of the insert into the base material. This
action mechanically locks the insert into place.

Fig. 497: View Of J 42385-400 Tool Kit
Courtesy of GENERAL MOTORS CORP.

The tool kit J 42385-400 is designed for use with either a suitable tap wrench or drill motor. See

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Special Tools. Limited access and larger hole repair may process better using a tap wrench. An
extension J 43965 may also be necessary to drive the thread repair tooling dependent on access to
the hole being repaired. See Special Tools.

Fig. 498: Drilled Hole Centerline
Courtesy of GENERAL MOTORS CORP.

It is critical that the drilling, counterboring and tapping of the hole to be repaired follows the
same centerline as the original hole.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3