GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2005 🢒 GTO 🢒 Engine 🢒 Engine Mechanical - 6.0L 🢒 Engine Block Plug Installation

    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 Sealers, Adhesives, and Lubricants .

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

  2. Install the engine block coolant heater to the engine block.

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

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

    4. Object Number: 63164 Size: SH
  4. Install the engine block coolant drain hole plug.

    5. Tighten
    Tighten the coolant drain hole plug to 60 N·m (44 lb ft).


    Object Number: 63167 Size: SH
  5. 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.
  6. Install the engine block left front oil gallery plug.

    7. Tighten
    Tighten the block left front oil gallery plug to 60 N·m (44 lb ft).


    Object Number: 64923 Size: SH
  7. 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.
  8. Install the engine block left rear oil gallery plug.

    9. Tighten
    Tighten the block left rear oil gallery plug to 60 N·m (44 lb ft).


    Object Number: 63228 Size: MH
  9. 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.
  10. Lubricate the O-ring seal with clean engine oil.
  11. Install the O-ring seal onto the plug.
  12. 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.

    13. Object Number: 64295 Size: SH
  13. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489) to the sides of the NEW front oil gallery plug.
  14. 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.

    15. Object Number: 1402136 Size: SH
  15. Install the left side knock sensor (718) and bolt (739).

    16. Tighten
    Tighten the bolt to 20 N·m (15 lb ft).


    Object Number: 1402140 Size: SH
  16. Install the right side knock sensor (718) and bolt (739).

    17. Tighten
    Tighten the bolt to 20 N·m (15 lb ft).