Hummer H3. Manual — part 543

Fig. 192: Oil Pan Bolts
Courtesy of GENERAL MOTORS CORP.

15. Remove the oil pan bolts (1).

16. Remove the oil pan by tilting the rear of the oil pan down to clear the transmission, pull the

oil pan rearward past the front wire harness, then lower the oil pan clear of the vehicle.

IMPORTANT:

The oil pan gasket is reusable. It is NOT necessary to
remove the oil pan gasket unless damaged.

DO NOT allow foreign material to enter the oil passages
of the oil pan, cap or cover the openings as required.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Fig. 193: Drilling Oil Pan Gasket Retaining Rivets
Courtesy of GENERAL MOTORS CORP.

17. Drill out the oil pan gasket retaining rivets (2), if required.

18. Remove the gasket (1) from the pan.

19. Discard the gasket and rivets.

20. Clean and inspect the oil pan. Refer to Automatic Transmission Flex Plate Cleaning

and Inspection.

Installation Procedure

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

IMPORTANT:

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.

If replacing the oil pan gasket it is not necessary to rivet the
NEW gasket to the oil pan.

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3

Fig. 194: View Of Sealant Applied To Front Oil Pan-To-Engine Block Junction
Courtesy of GENERAL MOTORS CORP.

1. Apply a 5 mm (0.2 in) bead of sealant 20 mm (0.8 in) long to the engine block. Refer to

Adhesives, Fluids, Lubricants, and Sealers for the correct part number. Apply the sealant
directly onto the tabs of the front cover gasket that protrudes into the oil pan surface.

Fig. 195: View Of Sealant Applied To Rear Oil Pan-To-Engine Block Junction
Courtesy of GENERAL MOTORS CORP.

2. Apply a 5 mm (0.2 in) bead of sealant 20 mm (0.8 in) long to the engine block. Refer to

Adhesives, Fluids, Lubricants, and Sealers for the correct part number. Apply the sealant

2008 Hummer H3

2008 ENGINE Engine Mechanical - 5.3L - H3