Hummer H3. Manual — part 210

Fig. 462: Inspecting Camshaft Cover
Courtesy of GENERAL MOTORS CORP.

1. Remove and discard the rubber ignition coil seals, and the camshaft cover seal.

2. Clean the camshaft cover with a suitable cleaning solvent.

3. Inspect the camshaft cover for cracks or damage.

4. Inspect the bolt threads for damage.

5. Replace the camshaft cover if necessary.

OIL PUMP CLEANING AND INSPECTION

2006 Hummer H3

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

Fig. 463: Measuring Inner Oil Pump Gear Tip Clearance
Courtesy of GENERAL MOTORS CORP.

1. Clean all parts of sludge, oil, and varnish by soaking in carburetor cleaner or cleaning

solvent.

2. Inspect for foreign material and determine the source of the foreign material.

3. Inspect the oil pump housing and engine front cover for the following conditions:

Cracks or casting imperfections

Scoring

2006 Hummer H3

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

Damaged threads

4. Do not attempt to repair the oil pump housing. Replace the oil pump housing if damage is

found.

5. Inspect the oil pump gears for damage.

6. Measure the inner oil pump gear tip clearance in several places.

Fig. 464: Measuring Outer Oil Pump Gear Diameter Clearance
Courtesy of GENERAL MOTORS CORP.

7. Measure the outer oil pump gear tip clearance in several places.

2006 Hummer H3

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

Fig. 465: Measuring Clearance Of Oil Pump Gear Side
Courtesy of GENERAL MOTORS CORP.

8. Measure the oil pump gear side clearance.

9. Inspect the pressure regulator valve for the following conditions:

Scoring

Sticking

Burrs - Burrs may be removed using a fine oil stone.

IMPORTANT: When deciding oil pump serviceability based on end

clearance, consider depth of the wear pattern in the pump
cover.

2006 Hummer H3

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