Engine Block Plug Installation (Medium Duty)

Tools Required 

J 41712  Oil Pressure Sending Unit Socket

1. Apply sealant GM P/N United States 12346004, GM P/N Canada 10953480, or equivalent to the threads of the coolant hole plug.
   NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
2. Install the engine coolant hole plug into the block.

   Tighten 

   Tighten the engine coolant hole plug to 60 N.m (40 lb ft).

   Fig 1: Engine Coolant Hole Plug (Medium Duty)

   Courtesy of GENERAL MOTORS CORP.
3. Apply sealant GM P/N United States 12346004, GM P/N Canada 10953480, or equivalent to the threads of the engine block heater, if applicable.
4. Install the engine block heater into the block.

   Tighten 

   Tighten the engine block heater to 50 N.m (37 lb ft).

   Fig 2: Engine Block Heater (Medium Duty)

   Courtesy of GENERAL MOTORS CORP.
5. Apply sealant GM P/N United States 12346004, GM P/N Canada 10953480, or equivalent to the threads of the oil gallery plugs.
6. Install the engine block top oil gallery plugs.

   Tighten 

   Tighten the top oil gallery plugs to 20 N.m(15lbft).

   Fig 3: Engine Block Top Oil Gallery Plugs (Medium Duty)

   Courtesy of GENERAL MOTORS CORP.
7. Apply sealant GM P/N United States 12346004, GM P/N Canada 10953480, or equivalent to the threads of the oil gallery plug.
8. Install the engine block left side oil gallery plug.

   Tighten 

   Tighten the left oil gallery plugs to 30 N.m (22 lb ft).

   Fig 4: Left Oil Gallery Plugs (Medium Duty)

   Courtesy of GENERAL MOTORS CORP.
9. Apply sealant GM P/N United States 12346004, GM P/N Canada 10953480, or equivalent to the threads of the oil gallery plugs.
10. Install the front oil gallery plugs.

    Tighten 

    Tighten the front oil gallery plugs to 30 N.m (22 lb ft).

    Fig 5: Front Oil Gallery Plugs (Medium Duty)

    Courtesy of GENERAL MOTORS CORP.
11. Apply sealant GM P/N United States 12346004, GM P/N Canada 10953480, or equivalent to the threads of the oil gallery plugs.
12. Install the rear oil gallery plugs.

    Tighten 

    Tighten the rear oil gallery plugs to 30 N.m (22 lb ft).

    Fig 6: Rear Oil Gallery Plugs (Medium Duty)

    Courtesy of GENERAL MOTORS CORP.
13. Apply thread adhesive GM P/N United States 12345493, GM P/N Canada 10953488, or equivalent to the threads of the engine block oil cooler hose fittings.
14. Install the engine block oil cooler hose fittings.

    Tighten 

    Tighten the engine block oil cooler hose fittings to 23N.m(17lbft).

    Fig 7: Engine Block Oil Cooler Hose Fittings (Medium Duty)

    Courtesy of GENERAL MOTORS CORP.

    Important:  Do not overtighten the knock sensor.

15. Install the left knock sensor to the engine block.

    Tighten 

    Tighten the left knock sensor to 20 N.m (15 lb ft).

    Fig 8: Left Knock Sensor (Medium Duty)

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16. Install the left side knock sensor shield.
17. Install the left side knock sensor shield bolts.

    Tighten 

    Tighten the left side knock sensor shield bolts to 50 N.m (37 lb ft).

    Fig 9: Left Side Knock Sensor Shield & Bolts (Medium Duty)

    Courtesy of GENERAL MOTORS CORP.

    Important:  Do not overtighten the knock sensor.

18. Install the right knock sensor to the engine block.

    Tighten 

    Tighten the right knock sensor to 20 N.m (15 lb ft).

    Fig 10: Right Knock Sensor (Medium Duty)

    Courtesy of GENERAL MOTORS CORP.
19. Apply sealant GM P/N United States 12346004, GM P/N Canada 10953480, or equivalent to the threads of the engine block coolant drain hole plugs.
20. Install the engine block coolant drain hole plugs.

    Tighten 

    Tighten the coolant drain hole plugs to 30N.m (22lbft).

    Fig 11: Coolant Drain Hole Plug (Medium Duty)

    Courtesy of GENERAL MOTORS CORP.
21. Apply sealer GM P/N United States 12377901, GM P/N Canada 10953504, to the outside diameter of the new camshaft rear bearing hole plug.
    Fig 12: Camshaft Rear Bearing Hole Plug (Medium Duty)

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22. Install the NEW camshaft rear bearing hole plug to the proper depth of (A) 7.600-6.200 mm (0.299-0.244 in).
    Fig 13: Camshaft Rear Bearing Hole Plug Proper Installation Position (Medium Duty)

    Courtesy of GENERAL MOTORS CORP.
23. Apply sealant GM P/N United States 12346004, GM P/N Canada 10953480, or equivalent to the threads of the oil pressure sensor.
24. Install the oil pressure sensor.

    Tighten 

    Using the J 41712  tighten the oil pressure sensor to 30 N.m (22 lb ft).

    Fig 14: Oil Pressure Sensor (Medium Duty)

    Courtesy of GENERAL MOTORS CORP.