GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2003 🢒 GMC MD Steel Tilt (W Model) 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, and 6.0L 🢒 Oil Pan Cleaning and Inspection

    Object Number: 178467 Size: SH

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

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

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

  1. Remove the oil level sensor from the pan.

    2. Object Number: 178471 Size: SH
  2. Remove the oil pan cover, gasket, and bolts, if required.

    3. Object Number: 873826 Size: SH
  3. Remove the oil pan drain plug and O-ring seal.

    4. Object Number: 178491 Size: SH
  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. Caution: Wear safety glasses in order to avoid eye damage.

  7. Dry the oil pan with compressed air.
  8. Inspect the gasket sealing surfaces for excessive scratches or gouging. Refer to Replacing Engine Gaskets .

    9. Object Number: 178467 Size: SH
  9. Inspect the oil level sensor seal surface and threads for damage.

    10. Object Number: 873826 Size: SH
  10. Inspect the oil pan drain plug and threaded drain hole for damaged threads.

    11. The drain plug O-ring seal may be used again if it is not cut or damaged.


    Object Number: 490699 Size: SH
  11. Inspect the oil filter sealing surface for scratches or gouging.
  12. Inspect the oil filter fitting (1) for a loose fit or damaged threads.
  13. Inspect the oil passages for restrictions.
  14. Inspect the oil filter bypass valve (2) for proper operation.

    15. Lightly depress the bypass valve. The valve spring should seat the valve to the proper position.