GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2008 🢒 H2 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, 6.0L, 6.2L, or 7.0L 🢒 Oil Pan Cleaning and Inspection

    Object Number: 1658160 Size: SH
  1. Remove the oil filter fitting (438), as required.

    2. Object Number: 1658301 Size: SH
  2. Remove the active fuel management oil pressure relief valve (455) and washer.
  3. Inspect the oil pressure relief valve for proper operation. Lightly depress the valve (2). The valve spring (1) should seat the valve to the proper closed position.

    4. Object Number: 1658296 Size: SH
  4. Remove the oil level sensor (727) and O-ring (728).

    5. Object Number: 1658299 Size: SH
  5. Remove the bolts (427) and baffle (428).

    6. Object Number: 1658297 Size: SH
  6. Remove the oil pan cover (434), bolts (435), and gasket (433).
  7. Clean the oil pan in solvent.

    8. Caution: Refer to Safety Glasses and Compressed Air Caution in the Preface section.

  8. Dry the oil pan with compressed air.

    9. Object Number: 1658303 Size: SH
  9. Inspect the oil pan for the following conditions:
    10. • Damaged gasket surfaces (1)
    • Restrictions within the oil passages (2) of the pan
    • Damaged oil filter seal surface (3)
    • Threaded oil level sensor hole (4) for damage