GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Impala 🢒 Engine 🢒 Engine Mechanical - 3.9L 🢒 Engine Block Assemble

    Object Number: 909630 Size: SH
  1. Apply sealer GM P/N 12346004 (Canadian P/N 10953480), or equivalent to the oil pressure switch threads.

    2. Notice: Refer to Fastener Notice in the Preface section.

  2. Install the engine oil pressure switch.

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


    Object Number: 909629 Size: SH
  3. Install the knock sensors.

    4. Tighten
    Tighten the knock sensors to 25 N·m (18 lb ft).


    Object Number: 909628 Size: SH
  4. Apply sealer GM P/N 12346004 (Canadian P/N 10953480), or equivalent to the engine block plug.
  5. Install a NEW engine block plug.

    6. Tighten
    Tighten the engine block plug to 60 N·m (44 lb ft).

  6. Install the transmission locating pins. The installation height should be 8.3-9.3 mm (0.327-0.366 in) (A).

    7. Object Number: 909627 Size: SH
  7. Apply sealer GM P/N 12346004 (Canadian P/N 10953480), or equivalent to the front oil gallery plug threads (110, 137).
  8. Install the front oil gallery plug (110).

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

  9. Install the front oil gallery plug (137).

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

  10. Apply sealer GM P/N 12377901 (Canadian P/N 10953504), or equivalent to the front oil gallery plug (107).
  11. Install the front oil gallery plug (107) so that it is 1.5 mm (0.06 in) below flush of the engine block.
  12. Install the engine front cover locating pins (546). The installation height should be 5.8-8.2 mm (0.228-0.323 in) (A).

    13. Object Number: 1956506 Size: SH
  13. Apply Sealer GM P/N 12346004 (Canadian P/N 10953480), or equivalent to the rear oil gallery plugs.
  14. Install the rear oil gallery plugs (103).

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

  15. Install the rear oil gallery plugs (102).

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


    Object Number: 187008 Size: SH
  16. Apply sealer GM P/N 12377901 (Canadian P/N 10953504), or equivalent to the camshaft rear bearing hole plug.
  17. Install the camshaft rear bearing hole plug.

    18. Object Number: 909514 Size: SH

    Notice: Maximum gasket performance is achieved when using new fasteners, which contain a thread-locking patch. If the fasteners are not replaced, a thread locking chemical must be applied to the fastener threads. Failure to replace the fasteners or apply a thread-locking chemical MAY reduce gasket sealing capability.

  18. Apply sealer GM P/N 12346004 (Canadian P/N 10953480), or equivalent to the left and right coolant drain plug threads.
  19. Install the left coolant drain plug.

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


    Object Number: 909516 Size: SH
  20. Install the right coolant drain plug.

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