Hummer H2. Manual - part 1727

Fig. 109: View Of Spark Plug 
Courtesy of GENERAL MOTORS CORP. 

9. Hand start the spark plug. 

Tighten: Tighten the spark plug to 15 N.m (11 lb ft). 

10. Install the spark plug wires at the ignition coil.  

11. Install the spark plug wire to the spark plug.  

12. Inspect the wires for proper installation: 

z

Push sideways on each boot in order to check for proper installation.  

z

Reinstall any loose boot.  

13. Install the valve rocker arm. Refer to Valve Rocker Arm and Push Rod Replacement .  

OIL LEVEL INDICATOR AND TUBE REPLACEMENT 

Removal Procedure 

NOTE:

Refer to Fastener Notice in Cautions and Notices.

 

2004 Hummer H2 

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

  

Fig. 110: Oil Level Indicator 
Courtesy of GENERAL MOTORS CORP. 

1. Remove the oil level indicator from the tube. 

 

2004 Hummer H2 

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

  

Fig. 111: Oil Level Indicator Tube 
Courtesy of GENERAL MOTORS CORP. 

2. Remove the oil level indicator tube bolt.  

3. Remove the oil level indicator tube from the engine block. 

4. Inspect the O-ring seal for cuts or damage.  

5. Remove the O-ring seal from the tube (if required). 

IMPORTANT: The O-ring seal may be reused if not cut or damaged.

 

2004 Hummer H2 

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

  

Installation Procedure 

Fig. 112: Oil Level Indicator Tube 
Courtesy of GENERAL MOTORS CORP. 

1. Lubricate the O-ring seal with clean engine oil.  

2. Install the O-ring seal onto the oil level indicator tube.  

3. Install the oil level indicator tube behind the exhaust manifold.  

4. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information. 

5. Install the oil level indicator tube into the block. The tube must be installed with the collar flush to the 

 

2004 Hummer H2 

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