Chevrolet Silverado / GMC Sierra. Service manual — part 269

Fig. 120: View Of Right Cylinder Head
Courtesy of GENERAL MOTORS CORP.

5. Remove the cylinder head bolts.

6. Remove the cylinder head.

IMPORTANT: The cylinder head bolts are NOT reusable.

NOTE:

After removal, place the cylinder head on 2 wood blocks in
order to prevent damage to the sealing surfaces.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 121: View Of Right Cylinder Head Gasket And Alignment Pins
Courtesy of GENERAL MOTORS CORP.

7. Remove the cylinder head gasket.

8. Discard the gasket.

9. Discard the cylinder head bolts.

10. Clean and inspect the cylinder head. Refer to Cylinder Head Cleaning and Inspection.

Installation Procedure

CAUTION: Wear safety glasses in order to avoid eye damage.

NOTE:

Clean all dirt, debris, and coolant from the engine block cylinder
head bolt holes. Failure to remove all foreign material may result in

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

damaged threads, improperly tightened fasteners or damage to
components.

IMPORTANT:

Do not reuse the cylinder head bolts. Install NEW cylinder
head bolts during assembly.

Do not use any type of sealant on the cylinder head gasket,
unless specified.

The cylinder head gaskets must be installed in the proper
direction and position.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2

Fig. 122: Identifying Cylinder Head Locating Pins Installation Position
Courtesy of GENERAL MOTORS CORP.

1. Clean the engine block cylinder head bolt holes, if required.

Thread repair tool J 42385-107, found in J 42385-200 may be used to clean the threads of
old threadlocking material. See Special Tools.

2. Use spray cleaner to clean out the hole. Refer to Sealers, Adhesives, and Lubricants for

the correct part number.

3. Clean the cylinder head bolt holes with compressed air.

4. Check the cylinder head locating pins for proper installation.

2008 Hummer H2

2008 ENGINE Engine Mechanical - 6.2L - H2