Hummer H2. Manual - part 1865

Fig. 620: Crankshaft Rear Oil Seal 
Courtesy of GENERAL MOTORS CORP. 

1. Lubricate the outside diameter (OD) of the oil seal (141) 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. 

IMPORTANT:

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

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Do not use the crankshaft rear oil seal again.  

 

2004 Hummer H2 

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

  

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

Fig. 621: View Of J 41479 
Courtesy of GENERAL MOTORS CORP. 

3. Install the J 41479 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 onto 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 tool.  

 

2004 Hummer H2 

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

  

ENGINE FRONT COVER INSTALLATION

Tools Required 

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J 41480 Front and Rear Cover Alignment - Oil Pan Surface. See Special Tools and Equipment .  

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J 41476 Front and Rear Cover Alignment Tool - Crankshaft Oil Seal Area. See Special Tools and 
Equipment .  

Fig. 622: Front Cover & Gasket 
Courtesy of GENERAL MOTORS CORP. 

IMPORTANT:

z

Do not use the crankshaft oil seal or the engine front cover gasket 
again.  

z

Do not apply any type sealant to the front cover gasket, unless 
specified.  

 

2004 Hummer H2 

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

  

1. Install the front cover gasket, cover, and bolts onto the engine.  

2. Tighten the cover bolts finger tight. Do not overtighten. 

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The special tools in this procedure are used to properly align the 
engine front cover at the oil pan surface and to center the crankshaft 
front oil seal. 

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All gasket surfaces should be free of oil or other foreign 
material during assembly. 

The crankshaft front oil seal MUST be centered in relation to 
the crankshaft. 

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The oil pan sealing surface at the front cover and engine block 
MUST be aligned within specifications.  

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An improperly aligned front cover may cause premature front 
oil seal wear and/or engine assembly oil leaks.  

 

2004 Hummer H2 

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