GM Service Manual Online
For 1990-2009 cars only

    Object Number: 1276785  Size: SH

    Important: Engine block plug, oil gallery, and coolant sealing washers may be used again if not bent, scored or otherwise damaged.

  1. Apply a 3.175 mm (0.125 in) bead of sealant GM P/N 12346004 (Canadian P/N 10953480) to the engine block coolant heater sealing washer, if applicable. Refer to Adhesives, Fluids, Lubricants, and Sealers .
  2. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the engine block coolant heater to the engine block.
  4. Tighten
    Tighten the block coolant heater to 50 N·m (37 lb ft).

  5. Apply a 3.175 mm (0.125 in) bead of sealant GM P/N 12346004 (Canadian P/N 10953480) to the engine block right rear coolant drain hole plug sealing washer.

  6. Object Number: 63164  Size: SH
  7. Install the coolant drain hole plug.
  8. Tighten
    Tighten the coolant drain hole plug to 60 N·m (44 lb ft).


    Object Number: 63167  Size: SH
  9. Apply a 3.175 mm (0.125 in) bead of sealant GM P/N 12346004 (Canadian P/N 10953480) to the engine block left front oil gallery plug sealing washer.
  10. Install the engine block left front oil gallery plug.
  11. Tighten
    Tighten the block left front oil gallery plug to 60 N·m (44 lb ft).


    Object Number: 64923  Size: SH
  12. Apply a 3.175 mm (0.125 in) bead of sealant GM P/N 12346004 (Canadian P/N 10953480) to the engine block left rear oil gallery plug sealing washer.
  13. Install the engine block left rear oil gallery plug.
  14. Tighten
    Tighten the block left rear oil gallery plug to 60 N·m (44 lb ft).


    Object Number: 63228  Size: MH
  15. Inspect the engine block rear oil gallery plug and O-ring seal. If the O-ring seal on the plug is not cut or damaged, the rear oil gallery plug may be used again.
  16. Lubricate the O-ring seal with clean engine oil.
  17. Install the O-ring seal onto the plug.
  18. Install the engine block rear oil gallery plug into the oil gallery bore. A properly installed block plug will protrude 0.8-1.4 mm (0.0315-0.055 in) beyond the rear face of the block.

  19. Object Number: 64295  Size: SH
  20. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489) to the sides of the NEW front oil gallery plug.
  21. Install a NEW engine block front oil gallery plug. Install the plug into the oil gallery bore 2.2-2.8 mm (0.0086-0.011 in) below flush.

  22. Object Number: 1402136  Size: SH
  23. Install the left side knock sensor (718) and bolt (739).
  24. Tighten
    Tighten the bolt to 20 N·m (15 lb ft).


    Object Number: 1402140  Size: SH
  25. Install the right side knock sensor (718) and bolt (739).
  26. Tighten
    Tighten the bolt to 20 N·m (15 lb ft).


    Object Number: 309854  Size: SH
  27. Install a NEW plug into the engine block, as required. Install the plug completely into the hole until the top edge of the plug is flush or slightly below the top surface of the block.