GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2009 🢒 Lucerne 🢒 Engine 🢒 Engine Mechanical - 4.6L 🢒 Oil Pan Cleaning and Inspection

Cleaning Procedure
  1. Clean the oil pan in solvent.

    2. Warning: Refer to Safety Glasses Warning in the Preface section.

  2. 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
  2. Inspect the interior of the oil pan for the following conditions:
    3. • 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)
  3. Repair or replace the oil pan as necessary.