Engine Block Plug Installation

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 .
Fig 1: View Of Engine Block Coolant Heater
Courtesy of GENERAL MOTORS CORP.
NOTE: Refer to Fastener Notice in Cautions and Notices.
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.
Fig 2: View Of Engine Block Left Front Coolant Drain Hole Plug
Courtesy of GENERAL MOTORS CORP.
4. Install the engine block left front coolant drain hole plug, if applicable.

   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.
Fig 3: View Of Engine Block Right Rear Coolant Drain Hole Plug
Courtesy of GENERAL MOTORS CORP.
6. Install the engine block right rear coolant drain hole plug.

   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.
Fig 4: View Of Engine Block Left Front Oil Gallery Plug
Courtesy of GENERAL MOTORS CORP.
9. Install the engine block left front oil gallery plug.

   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.
Fig 5: View Of Engine Block Left Rear Oil Gallery Plug
Courtesy of GENERAL MOTORS CORP.
11. Install the engine block left rear oil gallery plug.

    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.
Fig 6: View Of Engine Block Rear Oil Gallery Plug
Courtesy of GENERAL MOTORS CORP.
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.
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.
Fig 7: View Of Engine Block Front Oil Gallery Plug
Courtesy of GENERAL MOTORS CORP.
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. 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.

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

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