GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Silverado - 4WD 🢒 Engine 🢒 Engine Mechanical - 4.3L 🢒 Engine Block Plug Installation

Special Tools

J 41712 Oil Pressure Switch Socket

    Caution: Refer to Safety Glasses Caution in the Preface section.


    Object Number: 188023 Size: SH
  1. Install a NEW oil filter bypass valve.
    2. 1.1. Install the oil filter bypass valve into the oil gallery bore until slightly below flush with the surface of the engine block.
    1.2. Using a pointed punch, stake the engine block area around the oil filter bypass valve.

    Stake in 3 locations 120 degrees apart.


    Object Number: 5270 Size: SH
  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.

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


    Object Number: 480572 Size: SH
  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.

    6. 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.


    Object Number: 334546 Size: SH
  6. Install the crankshaft rear oil seal housing locator spring type S pin, if required.

    7. Object Number: 334540 Size: SH
  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.

    9. Object Number: 334543 Size: SH
  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.

    11. Object Number: 5271 Size: SH
  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.

    12. Notice: Refer to Fastener Notice in the Preface section.

  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.

    13. 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).

    Object Number: 334548 Size: SH
  13. Install the transmission locator dowel straight pins, if required.

    14. Object Number: 859876 Size: SH
  14. Install the left side cylinder head locator dowel pins, if required.

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


    Object Number: 859879 Size: SH
  15. Install the right side cylinder head locator dowel pins, if required.

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


    Object Number: 188052 Size: SH
  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.

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


    Object Number: 334549 Size: SH
  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.

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

  19. Install the engine oil pressure sensor fitting.

    20. 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).

    21. Object Number: 188018 Size: SH
  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 .

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


    Object Number: 1970823 Size: SH
  23. Install the block heater from the right side of the lower engine block.

    24. Tighten
    Tighten the block heater to XX N·m (XX lb ft).


    Object Number: 1877020 Size: SH
  24. Install the knock sensor on the right side of the lower engine block.
  25. Install the knock sensor bolt.

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


    Object Number: 1877015 Size: SH
  26. Install the knock sensor on the left side of the lower engine block.
  27. Install the knock sensor bolt.

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