Hummer H3. Manual — part 212

2. Inspect the threads on the retaining bolts.

3. Inspect the intake manifold for cracks.

4. Clean the internal ports of all debris.

5. Replace the intake manifold if necessary.

EXHAUST MANIFOLD CLEANING AND INSPECTION

Fig. 469: Inspecting Exhaust Manifold
Courtesy of GENERAL MOTORS CORP.

1. Clean the exhaust manifold.

2. Inspect the exhaust manifold for cracks or damage.

3. Inspect the exhaust manifold threads and studs (if necessary).

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3

Fig. 470: 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

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3

Fig. 471: 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

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - 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. 472: 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

2006 Hummer H3

2006 ENGINE Engine Mechanical - 3.5L (L52) - H3