Hummer H2. Manual - part 1736

Fig. 139: Crankshaft Rear Oil Seal 
Courtesy of GENERAL MOTORS CORP. 

1. Remove the engine flywheel. Refer to Engine Flywheel Replacement .  

2. Remove the crankshaft rear oil seal (1) from the rear cover.  

Installation Procedure 

IMPORTANT:

z

The flywheel spacer (if applicable) must be removed prior to oil seal 
installation.  

z

Do not lubricate the oil seal inside diameter (ID) or the crankshaft surface. 

 

2004 Hummer H2 

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

  

Fig. 140: Crankshaft Rear Oil Seal 
Courtesy of GENERAL MOTORS CORP. 

1. Lubricate the outside diameter (OD) of the oil seal (1) with clean engine oil. 

DO NOT allow oil or other lubricants to contact the seal surface. 

2. Lubricate the rear cover oil seal bore with clean engine oil. 

DO NOT allow oil or other lubricants to contact the crankshaft surface.

z

Do not reuse the crankshaft rear oil seal.  

 

2004 Hummer H2 

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

  

Fig. 141: View Of J 41479 
Courtesy of GENERAL MOTORS CORP. 

3. Install the J 41479 tapered cone (2) and bolts onto the rear of the crankshaft. See Special Tools and 

Equipment .  

4. Tighten the bolts until snug. Do not overtighten.  

5. Install the rear oil seal onto the tapered cone (2) and push the seal to the rear cover bore.  

6. Thread the J 41479 threaded rod into the tapered cone until the tool (1) contacts the oil seal. See Special 

Tools and Equipment .  

7. Align the oil seal into the tool (1).  

8. Rotate the handle of the tool (1) clockwise until the seal enters the rear cover and bottoms into the cover 

bore.  

9. Remove the J 41479 . See Special Tools and Equipment .  

10. Install the engine flywheel. Refer to Engine Flywheel Replacement . 

 

2004 Hummer H2 

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

  

ENGINE REAR COVER REPLACEMENT

Tools Required 

J 41476 Front and Rear Cover Alignment (at crankshaft seal area). See Special Tools and Equipment . 

Removal Procedure 

Fig. 142: Oil Pan-To-Rear Cover Bolts 
Courtesy of GENERAL MOTORS CORP. 

1. Remove the engine flywheel. Refer to Engine Flywheel Replacement .  

2. Remove the oil pan-to-rear cover bolts (1). 

 

2004 Hummer H2 

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