Hummer H2. Manual - part 1840

Fig. 528: Oil Level Sensor 
Courtesy of GENERAL MOTORS CORP. 

9. Inspect the oil level sensor seal surface and threads for damage. 

 

2004 Hummer H2 

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

  

Fig. 529: Oil Pan Drain Plug & O-Ring Seal 
Courtesy of GENERAL MOTORS CORP. 

10. Inspect the oil pan drain plug and threaded drain hole for damaged threads. 

The drain plug O-ring seal may be used again if not cut or damaged.

 

2004 Hummer H2 

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

  

Fig. 530: Oil Filter Fitting & Bypass Valve 
Courtesy of GENERAL MOTORS CORP. 

11. Inspect the oil filter sealing surface for scratches or gouging.  

12. Inspect the oil filter fitting (438) for a loose fit or damaged threads.  

13. Inspect the oil passages for restrictions.  

14. Inspect the oil filter bypass valve (436) for proper operation. 

Lightly depress the bypass valve. The valve spring should seat the valve to the proper position.

 

2004 Hummer H2 

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

  

INTAKE MANIFOLD CLEANING AND INSPECTION

Cleaning Procedure 

Fig. 531: View Of MAP Sensor 
Courtesy of GENERAL MOTORS CORP. 

1. Remove the manifold absolute pressure (MAP) sensor (714) from the rear of the intake. The MAP sensor 

is to be reinstalled upon completion of the cleaning and inspection procedures.  

2. Inspect the sealing grommet on the MAP sensor. The grommet should not be torn or damaged. 

IMPORTANT: Do not use the intake manifold-to-cylinder head sealing gaskets again.

 

2004 Hummer H2 

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