Chevrolet Silverado / GMC Sierra. Service manual — part 377

Fig. 503: View Of Oil Pan Inspection Points
Courtesy of GENERAL MOTORS CORP.

9. Inspect the oil pan for the following conditions:

Damaged gasket surfaces (1)

Restrictions within the oil passages (2) of the pan

Damaged oil filter seal surface (3)

Threaded oil level sensor hole (4) for damage

INTAKE MANIFOLD CLEANING AND INSPECTION

Cleaning Procedure

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 504: View Of Intake Manifold-To-Cylinder Head Gasket
Courtesy of GENERAL MOTORS CORP.

1. Remove and discard the intake manifold-to-cylinder head gaskets (514).

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 505: View Of Intake Manifold & Bolts
Courtesy of GENERAL MOTORS CORP.

2. Remove the manifold absolute pressure (MAP) sensor (714). Refer to Intake Manifold

Removal.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

3. Remove the evaporative emission (EVAP) canister purge solenoid valve, EVAP tubes, and

fuel rail with injectors. Refer to Fuel Rail and Injectors Removal.

4. Remove the throttle body and gasket. Refer to Throttle Body Removal.

5. Clean the intake manifold (500) in solvent.

6. Dry the intake manifold with compressed air.

Inspection Procedure

1. Inspect the manifold for the following conditions:

Damaged gasket or sealing surfaces

Loose threaded inserts or studs

Debris or restrictions within the passages of the manifold

Damaged or broken vacuum fittings

Inspect the composite intake manifold assembly for cracks or other damage.

CAUTION: Refer to Safety Glasses and Compressed Air Caution .

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2