GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Corvette 🢒 Engine 🢒 Engine Mechanical - 5.7L 🢒 Oil Pan Cleaning and Inspection

Important: 

   • Do not reuse the oil pan cover gasket. Install a NEW cover gasket during assembly.
   • Do not reuse the oil pan to engine block gasket. 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.


    Object Number: 63114 Size: SH
  1. Remove the oil level sensor from the pan.

    2. Object Number: 64842 Size: SH
  2. Remove the oil temperature sensor, oil pan cover, gasket, and bolts.

    3. Object Number: 74223 Size: SH
  3. Remove the oil pan drain plug and O-ring seal.

    4. Object Number: 384699 Size: SH
  4. Drill (3) out the oil pan gasket retaining rivets (2) (if required).
  5. Remove the oil pan gasket (1).

    6. Object Number: 156160 Size: SH
  6. Remove the oil pan baffle bolts and baffle.
  7. Clean the oil pan in solvent. Be sure to thoroughly clean all of the oil passages and recesses of the pan.
  8. Clean the oil pan gasket surfaces.

    9. Refer to Replacing Engine Gaskets .

    Caution: Wear safety glasses in order to avoid eye damage.

  9. Dry the oil pan with compressed air.
  10. Inspect the gasket sealing surfaces for excessive scratches or gouging.

    11. Refer to Replacing Engine Gaskets .


    Object Number: 63114 Size: SH
  11. Inspect the oil pan oil level sensor seal surface damage.
  12. Inspect the oil pan core plugs for looseness.

    13. Object Number: 74223 Size: SH
  13. Inspect the oil pan drain plug and threaded drain hole for damaged threads.

    14. The drain plug O-ring seal may be reused if not cut or damaged.


    Object Number: 64842 Size: SH
  14. Inspect the oil filter sealing surface for scratches or gouging.
  15. Inspect the oil filter fitting for a loose fit or damaged threads.
  16. Inspect the oil passages for restrictions.
  17. Inspect the O-ring seal of the oil level sensor cuts or damage. If the O-ring seal is not damaged, the O-ring may be used during assembly.
  18. Inspect the oil filter bypass valve for proper operation.

    19. Lightly push the bypass valve into the bore. The valve spring should reseat the valve to the proper position.