GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC C-Series Medium Duty Truck B7 🢒 Engine 🢒 Engine Mechanical - 7.4L 🢒 Engine Block Plug Installation

    Object Number: 180862 Size: SH
  1. Install NEW oil filter bypass valves to the proper depth, if removed.

    2. Stake the area around the bypass valve.


    Object Number: 180870 Size: SH
  2. Apply sealant GM P/N 12346004 or equivalent to the threads of the oil gallery plugs.

    3. Notice: 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.

  3. Install the engine block top oil gallery plugs.

    4. Tighten
    Tighten the top oil gallery plugs to 20 N·m (15 lb ft).


    Object Number: 180866 Size: SH
  4. Apply sealant GM P/N 12346004 or equivalent to the threads of the oil gallery plugs.
  5. Install the engine block rear oil gallery plugs.

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


    Object Number: 180871 Size: SH
  6. Apply sealant GM P/N 12346004 or equivalent to the threads of the oil gallery plugs.
  7. Install the engine block front oil gallery plugs.

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


    Object Number: 180869 Size: SH
  8. Apply sealant GM P/N 12346004 or equivalent to the threads of the oil gallery plugs.
  9. Install the engine block left side oil gallery plugs.

    10. Tighten
    Tighten the side oil gallery plugs to 30 N·m (22 lb ft).


    Object Number: 354082 Size: SH
  10. Apply sealant GM P/N 12346004 or equivalent to the threads of the engine block oil cooler plugs (without oil cooler).
  11. Install the engine block oil cooler plugs (without oil cooler).

    12. Tighten
    Tighten the engine block oil cooler plugs to 30 N·m (22 lb ft).


    Object Number: 180864 Size: SH
  12. Apply sealant GM P/N 12346004 or equivalent to the threads of the engine block oil cooler hose fittings (with oil cooler).
  13. Install the engine block oil cooler hose fittings (with oil cooler).

    14. Tighten
    Tighten the engine block oil cooler hose fittings to 23 N·m (17 lb ft).


    Object Number: 69033 Size: SH
  14. Apply sealant GM P/N 12346004 or equivalent to the threads of the engine block coolant drain hole plug.
  15. Install the engine block coolant drain hole plug.

    16. Tighten
    Tighten the coolant drain hole plug to 20 N·m (15 lb ft).


    Object Number: 181034 Size: SH
  16. Apply sealant GM P/N 12346004 or equivalent to the threads of the knock sensors.
  17. Install the left knock sensor (1) to the engine block.

    18. Tighten
    Tighten the knock sensor to 19 N·m (14 lb ft).

  18. Install the right knock sensor (2) to the engine block.

    19. Tighten
    Tighten the knock sensor to 19 N·m (14 lb ft).


    Object Number: 351821 Size: SH
  19. Install the left side knock sensor shield.
  20. Install the left side knock sensor shield bolts.

    21. Tighten
    Tighten the left side knock sensor shield bolts to 33 N·m (24 lb ft).


    Object Number: 180956 Size: SH
  21. Apply sealer GM P/N 12345493 to the engine block camshaft rear bearing hole.
  22. Install a NEW camshaft rear bearing hole plug to the proper depth.

    23. Object Number: 183593 Size: SH
  23. Apply sealer GM P/N 12345493 to the engine block expansion plug holes.
  24. Install NEW engine block expansion plugs to the proper depth.

    25. A properly installed expansion plug will be installed until flush or slightly below flush with the face of the block.