Hummer H2. Manual - part 1897

Fig. 10: Heat Shield Bolts, Heat Shield & Exhaust Manifold 
Courtesy of GENERAL MOTORS CORP. 

1. Install the heat shield (2), and bolts (1) to the exhaust manifold (1), if necessary. 

Tighten: Tighten the bolts to 9 N.m (80 lb in).

NOTE:

Refer to Fastener Notice in Cautions and Notices.

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2

  

Fig. 11: Exhaust Manifold Bolts, Manifold & Manifold Gasket (Right) 
Courtesy of GENERAL MOTORS CORP. 

2. Apply a 5 mm (0.2 in) wide band of threadlock GM P/N 12345493 (Canadian P/N 10953488) or 

equivalent to the threads of the exhaust manifold bolts.  

3. Install the NEW manifold gasket, exhaust manifold, and bolts. 

IMPORTANT:

z

Tighten the exhaust manifold bolts as specified in the service 
procedure. Improperly installed and/or leaking exhaust manifold 
gaskets may affect vehicle emissions and/or On-Board Diagnostics 
(OBD) II system performance.  

z

The cylinder head exhaust manifold bolt hole threads must be clean 
and free of debris or threadlocking material.  

z

Do not apply sealant to the first three threads of the bolt.  

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2

  

Tighten:  

1. Tighten the exhaust manifold bolts a first pass to 15 N.m (11 lb ft). Tighten the exhaust manifold 

bolts beginning with the center two bolts. Alternate from side-to-side, and work toward the outside 
bolts.  

2. Tighten the exhaust manifold bolts a final pass to 25 N.m (18 lb ft). Tighten the exhaust manifold 

bolts beginning with the center two bolts. Alternate from side-to-side, and work toward the outside 
bolts.  

4. Using a flat punch, bend over the exposed edge of the exhaust manifold gasket at the front of the right 

cylinder head.  

5. Install the oil level indicator tube. Refer to Oil Level Indicator and Tube Removal in Engine 

Mechanical - 4.8L, 5.3L and 6.0L.  

6. Install the spark plug wires.  

7. Install the inlet heater hose. Refer to Heater Hose Replacement - Inlet in Heating, Ventilation and Air 

Conditioning.  

8. Install the outlet heater hose. Refer to Heater Hose Replacement - Outlet in Heating, Ventilation and 

Air Conditioning.  

9. Install the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls - 4.8L, 

5.3L and 6.0L.  

10. Raise the vehicle. 

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2

  

Fig. 12: Exhaust Manifold Pipe Nuts (Right) 
Courtesy of GENERAL MOTORS CORP. 

11. Install the exhaust manifold pipe nuts. 

Tighten: Tighten the nuts to 50 N.m (37 lb ft).

 

2004 Hummer H2 

2004 ENGINE Engine Exhaust - Hummer H2