Oil Pan Cleaning and Inspection

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.

1. Remove the oil transfer tube bolts (1) and gaskets (3).
2. Remove the oil transfer tube (2).
3. Inspect the tube for damage or restrictions.
   Fig 1: Removing Oil Transfer Tube Bolts And Gaskets

   Courtesy of GENERAL MOTORS CORP.
4. Remove the plugs (1) from the oil galleries.
   Fig 2: Removing Plugs From Oil Galleries

   Courtesy of GENERAL MOTORS CORP.
5. Remove the oil pan baffle and bolts.
   Fig 3: Removing Oil Pan Baffle And Bolts

   Courtesy of GENERAL MOTORS CORP.
6. Remove the oil pan drain plug and O-ring seal.
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. Refer to REPLACING ENGINE GASKETS   .
   CAUTION: Refer to SAFETY GLASSES CAUTION in Cautions and Notices.
9. Dry the oil pan with compressed air.
10. Inspect the gasket sealing surfaces for excessive scratches or gouging. Refer to REPLACING ENGINE GASKETS   .
    Fig 4: Removing Oil Pan Drain Plug And O-Ring Seal

    Courtesy of GENERAL MOTORS CORP.
11. Inspect the oil pan drain plug and threaded drain hole for damaged threads.

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

    Fig 5: Inspecting Oil Pan Drain Plug And Threaded Drain Hole For Damaged Threads

    Courtesy of GENERAL MOTORS CORP.
12. Inspect the oil filter sealing surface for scratches or gouging.
13. Inspect the oil filter fitting (1) for a loose fit or damaged threads.
14. Inspect the oil passages for restrictions.
15. Inspect the oil filter bypass valve (2) for proper operation.

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

    Fig 6: Inspecting Oil Filter Fitting And Oil Filter Bypass Valve

    Courtesy of GENERAL MOTORS CORP.