GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Blazer - 4WD - RHD 🢒 Engine 🢒 Engine Mechanical - 4.3L 🢒 Oil Pan Replacement

Removal Procedure

    Object Number: 6833 Size: SH
  1. Disconnect the negative battery cable. Refer to Battery Replacement in Engine Electrical.
  2. Remove the oil level indicator.
  3. Remove the front differential assembly. Refer to Differential Carrier Assembly Replacement in Front Drive Axle.

    4. Object Number: 334324 Size: SH
  4. Remove the starter. Refer to Starter Motor Replacement in Engine Electrical.
  5. Remove the transmission cover.

    6. Object Number: 188048 Size: SH
  6. Remove the oil pan drain plug and drain the engine oil into a suitable container.
  7. Remove the oil filter adapter. Refer to Oil Filter Adapter and Bypass Valve Assembly Replacement .

    8. Object Number: 48327 Size: SH
  8. Remove the bolt holding the oil cooler pipe retainer to the oil pan.

    9. Object Number: 327996 Size: SH
  9. Remove the bolt holding the bracket for the starter wire harness and if equipped, the transmission cooler pipes.

    10. Object Number: 331034 Size: SH
  10. Remove the access plugs for the oil pan rear nuts.

    11. Object Number: 31739 Size: SH
  11. Remove the following oil pan fasteners:
    12. • Remove ten oil pan bolts.
    • Remove two nuts at the crankshaft rear oil seal.
    • Remove the transmission to oil pan bolts.
  12. Remove the oil pan from the engine. Refer to Oil Pan Removal .
  13. Clean all sealing surfaces. Refer to Oil Pan Clean and Inspect .

Installation Procedure

    Object Number: 31739 Size: SH
  1. Install the oil pan. Refer to Oil Pan Installation .

    2. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2. Install the transmission to oil pan bolts.

    3. Tighten
    Tighten the transmission to oil pan bolts to 47 N·m (35 lb ft).


    Object Number: 331034 Size: SH
  3. Install the access plugs for the oil pan rear nuts.

    4. Object Number: 327996 Size: SH
  4. Install the bolt holding the bracket for the starter wiring harness and if equipped, the transmission cooler pipes.

    5. Tighten
    Tighten the bracket bolt to 12 N·m (106 lb in).


    Object Number: 188048 Size: SH
  5. Install the oil pan drain plug.

    6. Tighten
    Tighten the drain plug to 25 N·m (18 lb ft).

  6. Install the oil filter adapter. Refer to Oil Filter Adapter and Bypass Valve Assembly Replacement .

    7. Object Number: 48327 Size: SH
  7. Install the bolt holding the oil cooler pipe retainer to the oil pan.

    8. Tighten
    Tighten the retainer bolt to 12 N·m (106 lb in).


    Object Number: 334324 Size: SH
  8. Install the transmission cover.

    9. Tighten
    Tighten the transmission cover bolts to 12 N·m (106 lb in).

  9. Install the starter motor. Refer to Starter Motor Replacement in Engine Electrical.

    10. Object Number: 6833 Size: SH
  10. Install the front differential assembly. Refer to Differential Carrier Assembly Replacement in Front Drive Axle.
  11. Install the oil level indicator.
  12. Fill the engine with engine oil. Refer to the Owner's Manual for the recommended engine oil and the capacity.
  13. Connect the battery negative cable. Refer to Battery Replacement in Engine Electrical.