Tools Required

J 41712  Oil Pressure Switch Socket

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 Sealers, Adhesives, and Lubricants .
NOTE: Refer to Fastener Notice .
Fig 1: View Of Engine Block Coolant Heater
Courtesy of GENERAL MOTORS CORP.
2. Install the engine block coolant heater to the engine block, if applicable.

   Tighten:  Tighten the block coolant heater to 40 N.m (30 lb ft).

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.
   Fig 2: View Of Engine Block Left Front Coolant Drain Hole Plug

   Courtesy of GENERAL MOTORS CORP.

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

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.
   Fig 3: View Of Right Rear Engine Block Coolant Drain Hole Plug

   Courtesy of GENERAL MOTORS CORP.

   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.

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

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.
   Fig 4: View Of Engine Block Left Front Oil Gallery Plug

   Courtesy of GENERAL MOTORS CORP.

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

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.
    Fig 5: View Of Engine Block Left Rear Oil Gallery Plug

    Courtesy of GENERAL MOTORS CORP.

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

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.
    Fig 6: View Of Engine Block Rear Oil Gallery Plug

    Courtesy of GENERAL MOTORS CORP.
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.
    Fig 7: View Of Engine Block Front Oil Gallery Plug

    Courtesy of GENERAL MOTORS CORP.
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.
    Fig 8: View Of Oil Pressure Sensor & J 41712

    Courtesy of GENERAL MOTORS CORP.

    Tighten:  Tighten the oil pressure sensor to 20 N.m (15 lb ft).