59. Engine Block Plug Installation

- Tools Required
- J 41712 Oil Pressure Switch Socket

Caution: Refer to Safety Glasses Caution in Service Precautions.





1. Install the transmission locator pins (if required).
A properly installed transmission locator pin will protrude 12.7 mm (0.5 inch) from the rear face of the engine block.





2. Apply sealant GM P/N 12346004 or equivalent to the outside diameter of the NEW expansion cup plug (camshaft rear bearing hole).
3. Install the NEW expansion cup plug (camshaft rear bearing hole).
A properly installed expansion cup plug will be installed 8.8 mm (0.348 inch) into the rear of the engine block.





4. Install the S type pin (crankshaft rear oil seal housing locator).

Notice: Refer to Fastener Notice in Service Precautions.

5. Apply sealant GM P/N 12346004 or equivalent to the threads of the left side rear and left rear top engine oil gallery plugs.





6. Install the left side rear and left rear top oil engine gallery plugs.
- Tighten the left side rear and left rear top engine oil gallery plugs to 20 Nm (15 ft. lbs.).
7. Apply sealant GM P/N 12346004 or equivalent to the threads of the square socket plugs (engine block oil gallery).





8. Install the square socket plugs.
- Tighten the square socket plugs to 20 Nm (15 ft. lbs.).
9. Apply sealant GM P/N 12346004 or equivalent to the outside diameter of the NEW engine oil gallery plugs.





10. Install the NEW engine block oil gallery plugs.
A properly installed engine oil gallery plug must be installed below flush with the front face of the engine block.
11. Apply threadlock GM P/N 12345382 or equivalent to the outside diameter of the NEW engine block core hole plugs.





12. Install the NEW engine block core hole plugs.
A properly installed engine block core hole plug must be installed flush with the bottom of the chamfer (1) of the engine block core hole.
13. Apply sealant GM P/N 12346004 or equivalent to the threads of the engine block coolant drain hole plug.





14. Install the engine block coolant drain hole plug.
- Tighten the engine block coolant drain hole plug to 20 Nm (15 ft. lbs.).
15. Apply sealant GM P/N 12346004 or equivalent to the threads of the engine oil pressure sensor fitting.

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

16. Install the engine oil pressure sensor fitting.
- Tighten the engine oil pressure sensor fitting to 15 Nm (11 ft. lbs.).

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





17. Rotate the engine oil pressure sensor fitting clockwise to the proper position (1), 50 degrees from the centerline (2).
18. Apply sealant GM P/N 12346004 or equivalent to the threads of the engine oil pressure gauge sensor.





19. Install the engine oil pressure gauge sensor using the J 41712.
- Tighten the engine oil pressure gauge sensor to 30 Nm (22 ft. lbs.).
20. Apply sealant GM P/N 12346004 or equivalent to the threads of the knock sensor.





21. Install the knock sensor.
- Tighten the knock sensor to 19 Nm (14 ft. lbs.).