Hummer H2. Manual - part 1743

Installation Procedure 

Fig. 166: Sealant Applied To Front Oil Pan-To-Engine Block Junction

IMPORTANT:

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The alignment of the structural oil pan is critical. The rear bolt hole 
locations of the oil pan provide mounting points for the transmission 
bellhousing. To ensure the rigidity of the powertrain and correct 
transmission alignment, it is important that the rear of the block and the 
rear of the oil pan must NEVER protrude beyond the engine block and 
transmission bellhousing plane.  

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Do not reuse the oil pan gasket.  

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It is not necessary to rivet the NEW gasket to the oil pan.  

 

2004 Hummer H2 

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

  

Courtesy of GENERAL MOTORS CORP.

1. Apply a 5 mm (0.20 in) bead of sealant GM P/N 12378190, or equivalent 20 mm (0.80 in) long to the 

engine block. Apply the sealant directly onto the tabs of the front cover gasket that protrudes into the oil 
pan surface. 

Fig. 167: Sealant Applied To Rear Oil Pan-To-Engine Block Junction 
Courtesy of GENERAL MOTORS CORP. 

2. Apply a 5 mm (0.20 in) bead of sealant GM P/N 12378190, or equivalent 20 mm (0.8 in) long to the 

engine block. Apply the sealant directly onto the tabs of the rear cover gasket that protrudes into the oil 
pan surface. 

 

2004 Hummer H2 

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

  

Fig. 168: View Of Oil Pan 
Courtesy of GENERAL MOTORS CORP. 

3. Pre-assemble the oil pan gasket to the pan. 

IMPORTANT: Be sure to align the oil gallery passages in the oil pan and engine block 

properly with the oil pan gasket.

 

2004 Hummer H2 

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

  

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Install the gasket onto the pan.  

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Install the oil pan bolts to the pan and through the gasket.  

4. Install the oil pan, gasket and bolts to the engine block.  

5. Tighten the oil pan bolts until snug. Do not overtighten. 

Fig. 169: Identifying Stud & Bolt Securing Transmission To Engine 
Courtesy of GENERAL MOTORS CORP. 

6. Install the transmission bolt and stud on the right side until snug. 

 

2004 Hummer H2 

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