Hummer H2. Manual — part 1783

Fig. 320: Cylinder Head & Bolts (Right)
Courtesy of GENERAL MOTORS CORP.

1. Remove the spark plugs from the cylinder head.

2. Remove the cylinder head bolts.

IMPORTANT: The cylinder head bolts can NOT be used again. Install NEW cylinder head

bolts during assembly.

NOTE:

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

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

3. Remove the cylinder head.

Fig. 321: Cylinder Head Gasket (Right)
Courtesy of GENERAL MOTORS CORP.

4. Remove the gasket.

5. Discard the gasket.

6. Discard the cylinder head bolts.

VALVE LIFTER REMOVAL

J 3049-A Valve Lifter Remover. See Special Tools and Equipment .

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

Fig. 322: Valve Lifters, Guide & Guide Bolts
Courtesy of GENERAL MOTORS CORP.

1. Remove the valve lifter guide bolts (211).

2. Remove the valve lifters and guide.

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2

Fig. 323: Using J 3049-A To Remove The Stuck Valve Lifters
Courtesy of GENERAL MOTORS CORP.

3. Use the J 3049-A or equivalent in order to remove the valve lifters, if required. See Special Tools and

Equipment .

IMPORTANT: Some valve lifters may be stuck in their bores because of gum or varnish

deposits.

2004 Hummer H2

2004 ENGINE Engine Mechanical - 4.8L, 5.3L, and 6.0L - Hummer H2