GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2004 🢒 Tahoe - 2WD 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, and 6.0L 🢒 Oil Pan Cleaning and Inspection

    Object Number: 260123 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: 1277111 Size: SH
  2. Remove the oil pan cover (434), gasket (433), and bolts (435), if required.

    3. Object Number: 260111 Size: SH
  3. Remove the oil pan drain plug and O-ring seal.

    4. Object Number: 260180 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: Refer to Safety Glasses Caution in the Preface section.

  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: 260123 Size: SH
  9. Inspect the oil level sensor seal surface and threads for damage.

    10. Object Number: 260111 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 not cut or damaged.


    Object Number: 1272831 Size: SH
  11. Inspect the oil filter sealing surface for scratches or gouging.
  12. Inspect the oil filter fitting (438) for a loose fit or damaged threads.
  13. Inspect the oil passages for restrictions.
  14. Inspect the oil filter bypass valve (436) for proper operation.

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