Hummer H2. Manual - part 1749

Fig. 190: Oil Pump Screen & O-Ring Seal 
Courtesy of GENERAL MOTORS CORP. 

5. Lubricate a NEW oil pump screen O-ring seal with clean engine oil.  

6. Install the NEW O-ring seal onto the oil pump screen. 

Align the oil pump screen mounting brackets with the correct crankshaft bearing cap studs.

IMPORTANT: Push the oil pump screen tube completely into the oil pump prior to 

tightening the bolt. Do not allow the bolt to pull the tube into the pump.

 

2004 Hummer H2 

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

  

7. Install the oil pump screen.  

8. Install the oil pump screen bolt and nuts. 

Tighten:  

1. Tighten the oil pump screen bolt to 12 N.m (106 lb in).  

2. Tighten the crankshaft oil deflector/oil pump screen nuts to 25 N.m (18 lb ft).  

9. Install the engine front cover. Refer to Engine Front Cover Replacement .  

10. Install the oil pan. Refer to Oil Pan Replacement .  

TIMING CHAIN AND SPROCKETS REPLACEMENT 

Tools Required 

z

J 8433 Two Jaw Puller  

z

J 41816-2 Crankshaft End Protector  

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J 41558 Crankshaft Sprocket Remover. See Special Tools and Equipment .  

z

J 41665 Crankshaft Balancer and Sprocket Installer. See Special Tools and Equipment .  

Removal Procedure 

 

2004 Hummer H2 

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

  

Fig. 191: Camshaft Sprocket, Bolt & Timing Chain 
Courtesy of GENERAL MOTORS CORP. 

1. Remove the oil pump. Refer to Oil Pump, Pump Screen and Deflector Replacement .  

2. Rotate the crankshaft until the timing marks on the crankshaft and the camshaft sprockets are aligned. 

3. Remove the camshaft sprocket bolts. 

NOTE:

Do not turn the crankshaft assembly after the timing chain has been 
removed in order to prevent damage to the piston assemblies or the 
valves.

 

2004 Hummer H2 

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

  

4. Remove the camshaft sprocket and timing chain. 

Fig. 192: View Of J 8433-1, J 41816-2 & J 41558 
Courtesy of GENERAL MOTORS CORP. 

5. Use the J 8433 , the J 41816-2 and the J 41558 in order to remove the crankshaft sprocket. See Special 

Tools and Equipment . 

 

2004 Hummer H2 

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