GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2000 🢒 Regal (China) 🢒 Engine 🢒 Engine Mechanical - 2.5L (LB8) and 3.0L (L46) 🢒 Engine Block Assemble

    Object Number: 186993 Size: SH
  1. Apply sealer GM P/N 12346004 or the equivalent to the oil pressure switch threads.

    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 engine oil pressure switch.

    3. Tighten
    Tighten the engine oil pressure switch to 16 N·m (12 lb ft).


    Object Number: 187003 Size: SH
  3. Install the camshaft position sensor.
  4. Install the camshaft position sensor bolt.

    5. Tighten
    Tighten the camshaft position sensor bolt to 10 N·m (89 lb in).


    Object Number: 187006 Size: SH
  5. Install the crankshaft position sensor into the side of the engine block.
  6. Apply threadlock GM P/N 12345382 or the equivalent to the position sensor stud threads.
  7. Install the crankshaft position sensor stud.

    8. Tighten
    Tighten the crankshaft position sensor stud to 11 N·m (98 lb in).


    Object Number: 187001 Size: SH
  8. Apply sealer GM P/N 12346004 or the equivalent to the knock sensor threads.
  9. Install the knock sensor.

    10. Tighten
    Tighten the knock sensor to 19 N·m (14 lb ft).


    Object Number: 55266 Size: SH
  10. Apply sealer GM P/N 12346004 or the equivalent to the front oil gallery plug threads (1 and 2).
  11. Install the front oil gallery plug (1).

    12. Tighten
    Tighten the oil gallery plug (1) to 19 N·m (14 lb ft).

  12. Install the front oil gallery plug (2).

    13. Tighten
    Tighten the oil gallery plug (2) to 33 N·m (24 lb ft).


    Object Number: 623047 Size: SH
  13. Apply sealer GM P/N 12346004 or the equivalent to the rear oil gallery plug threads (1 and 4).
  14. Install the rear oil gallery plugs (1 and 4).

    15. Tighten
    Tighten the oil gallery plugs (1 and 4) to 19 N·m (14 lb ft).

  15. Install the rear oil gallery plugs (2 and 3).

    16. Tighten
    Tighten the oil gallery plugs (2 and 3) to 33 N·m (24 lb ft).

  16. Apply sealer GM P/N 12346004 or the equivalent to the engine block plugs.
  17. Install the remaining engine block plugs.

    18. Object Number: 187087 Size: SH
  18. Apply sealant GM P/N 12346004 or the equivalent to the coolant drain plug threads.
  19. Install the left coolant drain plug.

    20. Tighten
    Tighten the coolant drain plug to 19 N·m (14 lb ft).


    Object Number: 187088 Size: SH
  20. Apply sealant GM P/N 12346004 or the equivalent to the coolant drain plug threads.
  21. Install the right coolant drain plug.

    22. Tighten
    Tighten the coolant drain plug to 19 N·m (14 lb ft).