Hummer H2. Manual - part 1904

Fig. 36: Insulators & Muffler Hangers 
Courtesy of GENERAL MOTORS CORP. 

1. Install the insulators to the muffler hangers.  

2. With the aid of an assistant, slide the muffler forward in order to install the muffler to the catalytic 

converter.  

3. Install the insulators to the frame hangers. 

IMPORTANT: Apply lubricant to the insulators to aid in installation.

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2

  

Fig. 37: Exhaust Muffler Nuts 
Courtesy of GENERAL MOTORS CORP. 

4. Install the exhaust muffler nuts, until snug. 

5. Tighten the exhaust pipe clamp bolt and muffler nuts. 

Tighten:  

z

Tighten the exhaust muffler nuts to 40 N.m (30 lb ft).  

z

Tighten the exhaust pipe clamp to 44 N.m (33 lb ft).  

6. Raise the rear suspension to ride height.  

7. Connect the right hand air suspension level sensor, if equipped. Refer to Air Spring Leveling Sensor 

Replacement in Air Suspension.  

8. Install the right hand shock lower bolt and nut. 

Tighten: Tighten the bolt and nut to 105 N.m (77 lb ft) 

9. Install the rear track bar bolt and nut. 

Tighten: Tighten the bolt and nut to 105 N.m (77 lb ft)

NOTE:

Refer to Fastener Notice in Cautions and Notices.

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2

  

10. Install the right hand lower stabilizer nut. 

Tighten: Tighten the nut to 72 N.m (53 lb ft) 

11. Remove the jack stands from under the rear axle.  

12. Lower the vehicle. Ensure the air springs seat properly as the vehicle is being lowered.  

13. If equipped with air suspension, start the engine and idle for 2 minutes to ensure the air spring leveling 

system is functioning properly.  

FLOOR PANEL HEAT SHIELD REPLACEMENT 

Removal Procedure 

Fig. 38: Exhaust Front Heat Shield Nuts 
Courtesy of GENERAL MOTORS CORP. 

1. Remove the exhaust front heat shield nuts. 

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2

  

2. Remove the exhaust front heat shield from the studs. 

Fig. 39: Exhaust Heat Shield(S) 
Courtesy of GENERAL MOTORS CORP. 

3. Remove the exhaust heat shield nuts.  

4. Remove the exhaust heat shield(s) from the studs.  

Installation Procedure 

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2