Engine Block Plug Installation

Tools Required 

J 41712  Oil Pressure Switch Socket

1. Install a NEW oil filter bypass valve.
   1. Install the oil filter bypass valve into the oil gallery bore until slightly below flush with the surface of the engine block.
   2. Using a pointed punch, stake the engine block area around the oil filter bypass valve.

      Stake in 3 locations 120 degrees apart.

      Fig 1: Installing Oil Filter Bypass Valve

      Courtesy of GENERAL MOTORS CORP.
2. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent, to the outside diameter of the NEW front engine oil gallery plugs.
3. Install the NEW front engine block oil gallery plugs.

   A properly installed front engine oil gallery plug must be installed slightly below flush with the front face of the engine block.

   Fig 2: Installing Front Engine Block Oil Gallery Plugs

   Courtesy of GENERAL MOTORS CORP.
4. Apply threadlock GM P/N 12345382 (Canadian P/N 10953489) or equivalent, to the outside diameter of the NEW engine block core hole plugs.
5. Install the NEW engine block core hole plugs.

   A properly installed engine block core hole plug must be installed flush or below the bottom of the chamfer (1) of the engine block core hole.

   Fig 3: Installing Engine Block Core Hole Plugs

   Courtesy of GENERAL MOTORS CORP.
6. Install the crankshaft rear oil seal housing locator spring type S pin, if required.
   Fig 4: Installing Crankshaft Rear Oil Seal Housing Locator Spring Type S Pin

   Courtesy of GENERAL MOTORS CORP.
7. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent, to the outside diameter of the NEW expansion cup plug.
8. Install the NEW expansion cup plug into the balance shaft rear bearing hole.
   Fig 5: Installing Expansion Cup Plug Into Balance Shaft Rear Bearing Hole

   Courtesy of GENERAL MOTORS CORP.
9. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent, to the outside diameter of the NEW expansion cup plug.
10. Install the NEW expansion cup plug into the camshaft rear bearing hole.
    Fig 6: Installing Expansion Cup Plug Into Camshaft Rear Bearing Hole

    Courtesy of GENERAL MOTORS CORP.
11. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent, to the threads of the engine block right rear oil gallery plug, the engine block left rear oil gallery plug, and the engine block left side oil gallery plug.
    CAUTION: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
12. Install the engine block right rear oil gallery plug, the engine block left rear oil gallery plug, and the engine block left side oil gallery plug.

    Tighten 

    • Tighten the engine block left side oil gallery plug and the engine block right rear oil gallery plug to 20 N.m (15 lb ft).
    • Tighten the engine block left rear oil gallery plug to 30 N.m (22 lb ft).
      Fig 7: Installing Engine Block Oil Gallery Plugs

      Courtesy of GENERAL MOTORS CORP.
13. Install the transmission locator dowel straight pins, if required.
    Fig 8: Installing Transmission Locator Dowel Straight Pins

    Courtesy of GENERAL MOTORS CORP.
14. Install the left side cylinder head locator dowel pins, if required.

    The installation height should be 6.3-6.5 mm (0.248-0.256 in) (a).

    Fig 9: Installing Left Side Cylinder Head Locator Dowel Pins

    Courtesy of GENERAL MOTORS CORP.
15. Install the right side cylinder head locator dowel pins, if required.

    The installation height should be 6.3-6.5 mm (0.248-0.256 in) (a).

    Fig 10: Installing Right Side Cylinder Head Locator Dowel Pins

    Courtesy of GENERAL MOTORS CORP.
16. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent, to the threads of the engine block coolant drain hole plugs.
17. Install the engine block coolant drain hole plugs.

    Tighten 

    Tighten the engine block coolant hole plugs to 20 N.m (15 lb ft).

    Fig 11: Installing Engine Block Coolant Drain Hole Plugs

    Courtesy of GENERAL MOTORS CORP.
18. If reusing the engine oil pressure sensor fitting, apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent, to the threads of the engine oil pressure sensor fitting.

    Important:  Do not loosen the engine oil pressure fitting after the initial torque has been obtained.

19. Install the engine oil pressure sensor fitting.

    Tighten 

    Tighten the engine oil pressure sensor fitting to 15 N.m (11 lb ft).

    Important:  Do not rotate the engine oil pressure fitting clockwise more than 359 degrees after the initial torque has been obtained.

20. Rotate the engine oil pressure sensor fitting clockwise to the proper position (1), 50 degrees from the centerline (2).
    Fig 12: Installing Engine Oil Pressure Sensor Fitting

    Courtesy of GENERAL MOTORS CORP.
21. If reusing the engine oil pressure gage sensor, apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent, to the threads of the engine oil pressure gage sensor.
22. Install the engine oil pressure gage sensor using the J 41712  .

    Tighten 

    Tighten the engine oil pressure gage sensor to 30 N.m (22 lb ft).

    Fig 13: Installing Engine Oil Pressure Gage Sensor Using J 41712

    Courtesy of GENERAL MOTORS CORP.
23. Install the knock sensor (2).
24. Install the knock sensor retaining bolt (1).

    Tighten 

    Tighten the knock sensor to 25 N.m (18 lb ft).

    Fig 14: Installing Knock Sensor & Retaining Bolt

    Courtesy of GENERAL MOTORS CORP.