Hummer H2. Manual — part 1839

OIL PAN CLEANING AND INSPECTION

Fig. 524: Oil Level Sensor
Courtesy of GENERAL MOTORS CORP.

1. Remove the oil level sensor from the pan.

IMPORTANT:

z

Do not use the oil pan cover gasket again. Install a NEW cover
gasket during assembly.

z

Do not use the oil pan to engine block gasket again. Install a NEW
gasket during assembly.

z

When installing a NEW oil pan gasket, it is not necessary to install
the rivets that retain the NEW gasket to the pan.

2004 Hummer H2

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

Fig. 525: Oil Pan Cover, Bolts & Gasket
Courtesy of GENERAL MOTORS CORP.

2. Remove the oil pan cover (434), gasket (433), and bolts (435), if required.

2004 Hummer H2

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

Fig. 526: Oil Pan Drain Plug & O-Ring Seal
Courtesy of GENERAL MOTORS CORP.

3. Remove the oil pan drain plug and O-ring seal.

2004 Hummer H2

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

Fig. 527: Oil Pan Baffle & Bolts
Courtesy of GENERAL MOTORS CORP.

4. Remove the oil pan baffle and bolts.

5. Clean the oil pan in solvent. Be sure to thoroughly clean all of the oil passages and recesses of the pan.

6. Clean the oil pan gasket surfaces. Refer to Replacing Engine Gaskets .

7. Dry the oil pan with compressed air.

8. Inspect the gasket sealing surfaces for excessive scratches or gouging. Refer to Replacing Engine

Gaskets .

CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.

2004 Hummer H2

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