GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2006 🢒 GMC Sierra Denali 🢒 Engine 🢒 Engine Mechanical - 4.8L, 5.3L, and 6.0L 🢒 Engine Block Plug Installation

Tools Required

J 41712 Oil Pressure Switch Socket


    Object Number: 1276785 Size: SH

    Important: 

       • Engine block plug, oil gallery and coolant, sealing washers may be used again if they are not bent, scored or otherwise damaged.
       • Apply the proper amount and type of sealant to the sealing washer as recommended in the service procedure.

  1. Apply a 3.175 mm (0.125 in) bead of sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent, 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.

  2. Install the engine block coolant heater to the engine block, if applicable.

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


    Object Number: 63165 Size: SH
  3. Apply a 3.175 mm (0.125 in) bead of sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the engine block left rear coolant drain hole plug sealing washer, if applicable.
  4. Install the engine block left front coolant drain hole plug, if applicable.

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


    Object Number: 1201542 Size: SH
  5. Apply a 3.175 mm (0.125 in) bead of sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the engine block right rear coolant drain hole plug sealing washer, or for HP2 equipped vehicles, to the threads of the coolant fitting.
  6. Install the engine block right rear coolant drain hole plug.

    7. Tighten
    Tighten the block right rear coolant drain hole plug to 60 N·m (44 lb ft).

  7. On vehicles equipped with HP2, install the coolant fitting.

    8. Tighten
    Tighten the coolant fitting to 35 N·m (26 lb ft).


    Object Number: 63167 Size: SH
  8. Apply a 3.175 mm (0.125 in) bead of sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the engine block left front oil gallery plug sealing washer.
  9. Install the engine block left front oil gallery plug.

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


    Object Number: 64923 Size: SH
  10. Apply a 3.175 mm (0.125 in) bead of sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the engine block left rear oil gallery plug sealing washer.
  11. Install the engine block left rear oil gallery plug.

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


    Object Number: 63228 Size: MH
  12. 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.
  13. Lubricate the O-ring seal with clean engine oil.
  14. Install the 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.

    15. Object Number: 64295 Size: SH

    Important: The engine block front oil gallery plug should not be removed, unless service is required.

  15. Apply sealant GM P/N 12345382 (Canadian P/N 10953489), or equivalent, to the sides of the NEW front oil gallery plug.
  16. Install a NEW engine block front oil gallery plug, if required. Install the front oil gallery plug into the oil gallery bore 2.2-2.8 mm (0.0086-0.011 in) below flush.

    17. Object Number: 823316 Size: SH
  17. Apply sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent, to the threads of the oil pressure sensor.
  18. Use the J 41712 , or equivalent, in order to install the oil pressure sensor.

    19. Tighten
    Tighten the oil pressure sensor to 35 N·m (26 lb ft).