Hummer H3. Manual — part 416

2. Remove all sealing material from the oil pan rails.

3. Inspect the oil pan sealing surfaces for nicks or damage. Remove any minor nicks with a fine

flat file.

4. Inspect the threads in the oil drain plug hole.

5. Replace the oil pan if necessary.

ENGINE FRONT COVER CLEANING AND INSPECTION

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

Fig. 492: Inspecting Engine Front Cover
Courtesy of GENERAL MOTORS CORP.

1. Clean the engine front cover with cleaning solvent.

IMPORTANT: Do not use a motorized tool or bristle disc to clean this

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

2. Remove all sealing material.

3. Inspect the engine front cover sealing surfaces for nicks or damage. Use a fine flat file to

remove any minor nicks.

4. Inspect the engine front cover threaded holes for damage.

5. Repair or replace the engine front cover as necessary.

INTAKE MANIFOLD CLEANING AND INSPECTION

Fig. 493: Inspecting Intake Manifold
Courtesy of GENERAL MOTORS CORP.

1. Clean the intake manifold gasket mating surface.

component.

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3

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. 494: 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).

2007 Hummer H3

2007 ENGINE Engine Mechanical - 3.7L - H3