GM Service Manual Online
For 1990-2009 cars only

Cleaning Procedure

  1. Clean the oil pan in solvent.
  2. Caution: Wear safety glasses in order to avoid eye damage.

  3. Dry the oil pan with compressed air.

Inspection Procedure


    Object Number: 578644  Size: SH
  1. Inspect the exterior of the oil pan for the following conditions:
  2. • The drain plug hole for damaged threads (1)
    • Damage to the engine mount bracket mounting holes (4)
    • The oil level switch (3) hole for damaged threads
    • Dents or damage to the exterior of the oil pan (2)
    • An oil pan that is dented may interfere with the position of the oil pump screen or not distribute oil properly in the pan sump area.
    • Damage to the oil pan gasket

    Object Number: 578649  Size: SH
  3. Inspect the interior of the oil pan for the following conditions:
  4. • Gouges or damage to the oil pan sealing surfaces (1)
    • Damage to the oil pan baffle (2)
    • Damage to the oil pan bolt holes (3)
  5. Repair or replace the oil pan as necessary.