Hummer H3. Manual — part 526

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
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).

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Fig. 136: Checking Cylinder Head Bolt Holes
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. Spray cleaner GM P/N 12346139, P/N 12377981 (Canadian P/N 10953463), or equivalent

into the hole.

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

4. Check the cylinder head locating pins for proper installation (a) 8.3 mm (0.327 in).

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Fig. 137: Cylinder Head Gasket
Courtesy of GENERAL MOTORS CORP.

5. Install the NEW cylinder head gasket (217) onto the locating pins.

IMPORTANT: When properly installed, with FRONT on the left side, the tab

on the cylinder head gasket should be located left of center.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Fig. 138: View Of Cylinder Head & Bolts
Courtesy of GENERAL MOTORS CORP.

6. Install the cylinder head (218) onto the locating pins.

7. Install the NEW cylinder head bolts (220, 221).

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3