Engine Block Plug Installation

Tools Required 

J 41712  Oil Pressure Switch Socket. See Special Tools and Equipment .

CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.
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: Engine Block Core Hole Chamfer
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
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 Bole
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.
NOTE: Refer to Fastener Notice in Cautions and Notices.
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 Right Rear Oil gallery Plug
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: Left Side Cylinder Head Locator Dowel Pins Proper Installation Position
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: Right Side Cylinder Head Locator Dowel Pins Proper Installation Position
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: Engine Oil Pressure Sensor Proper Installation Position
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: 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: Locating Knock Sensor & Retaining Bolt
Courtesy of GENERAL MOTORS CORP.