Hummer H2. Manual - part 1831

Fig. 494: Coolant Plug (Right Cylinder Head) 
Courtesy of GENERAL MOTORS CORP. 

12. Install sealant GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the threads of the plug.  

13. Install the coolant plug to the right cylinder head. 

Tighten: Tighten the coolant plug to 20 N.m (15 lb ft).

 

2004 Hummer H2 

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

  

Fig. 495: Cylinder Head Expansion Plugs 
Courtesy of GENERAL MOTORS CORP. 

14. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent to the sides of the cylinder 

head expansion plugs (226).  

15. Install the expansion plugs into the cylinder head. 

A properly installed plug should be installed 2.5 mm (0.1 in) below the end face of the head. 

OIL PUMP DISASSEMBLE 

 

2004 Hummer H2 

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

  

Fig. 496: Oil Pump Cover Bolts 
Courtesy of GENERAL MOTORS CORP. 

1. Remove the oil pump cover bolts. 

IMPORTANT: The internal parts of the oil pump assembly are not serviced separately, 

excluding the spring. If the oil pump components are worn or damaged, 
replace the oil pump as an assembly.

 

2004 Hummer H2 

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

  

Fig. 497: Oil Pump & Cover 
Courtesy of GENERAL MOTORS CORP. 

2. Remove the oil pump cover. 

 

2004 Hummer H2 

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