Hummer H2. Manual - part 1734

Fig. 132: Crankshaft Front Oil Seal 
Courtesy of GENERAL MOTORS CORP.

IMPORTANT:

z

Do not lubricate the oil seal sealing surface. 

z

Do not reuse the crankshaft oil seal.  

 

2004 Hummer H2 

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

  

1. Lubricate the outer edge of the oil seal (1) with clean engine oil.  

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

Fig. 133: View Of J 41478 
Courtesy of GENERAL MOTORS CORP. 

3. Install the crankshaft front oil seal onto the J 41478 guide. See Special Tools and Equipment .  

4. Install the J 41478 threaded rod (with nut, washer, guide, and oil seal) into the end of the crankshaft. See 

Special Tools and Equipment .  

5. Use the J 41478 in order to install the oil seal into the cover bore. See Special Tools and Equipment . 

1. Use a wrench and hold the hex on the installer bolt. 

 

2004 Hummer H2 

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

  

2. Use a second wrench and rotate the installer nut clockwise until the seal bottoms in the cover bore.  

3. Remove the J 41478 . See Special Tools and Equipment .  

4. Inspect the oil seal for proper installation. 

The oil seal should be installed evenly and completely into the front cover bore. 

6. Install the crankshaft balancer. Refer to Crankshaft Balancer Replacement .  

ENGINE FRONT COVER REPLACEMENT 

Tools Required 

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

Removal Procedure 

Fig. 134: Oil Pan-To-Front Cover Bolts 
Courtesy of GENERAL MOTORS CORP. 

1. Remove the water pump. Refer to Water Pump Replacement in Engine Cooling.  

2. Remove the crankshaft balancer. Refer to Crankshaft Balancer Replacement .  

3. Remove the oil pan-to-front cover bolts. 

 

2004 Hummer H2 

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

  

Fig. 135: Front Cover & Gasket 
Courtesy of GENERAL MOTORS CORP. 

4. Remove the front cover bolts.  

5. Remove the front cover and gasket.  

6. Discard the front cover gasket.  

7. Clean and inspect the engine front cover. Refer to Engine Front Cover Cleaning and Inspection .  

Installation Procedure 

IMPORTANT:

z

Do not reuse the crankshaft oil seal or front cover gasket.  

z

Do not apply any type of sealant to the front cover gasket (unless 
specified).  

z

The special tool in this procedure is used to properly center the front 

 

2004 Hummer H2 

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