GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 Yukon - 2WD 🢒 Engine 🢒 Engine Mechanical - 8.1L 🢒 Engine Block Plug Removal

Engine Block Plug Removal C/K/G/C3500HD

Tools Required

J 41712 Oil Pressure Sending Unit Socket


    Object Number: 471089 Size: SH
  1. Remove the oil pressure switch using J 41712 .

    2. Object Number: 471118 Size: SH

    Important: Use care not to damage the camshaft bearings.

  2. Remove the camshaft rear bearing hole plug:
    3. 2.1. Obtain a suitable self-threading screw.
    2.2. Drill a hole into the plug.
    2.3. Install the self-threading screw.
    2.4. Pull on the plug until it has left the bore.
    2.5. An alternate method to remove the plug would be to insert a long shaft or bar through the front of the engine and drive the plug from the bore.

    Object Number: 471100 Size: SH
  3. Remove the left side knock sensor shield bolts.
  4. Remove the left side knock sensor shield.

    5. Object Number: 471081 Size: SH
  5. Remove the left side knock sensor.

    6. Object Number: 471076 Size: SH
  6. Remove the right side knock sensor.

    7. Object Number: 471126 Size: SH
  7. Remove the engine block oil cooler hose fittings.

    8. Object Number: 471134 Size: SH
  8. Remove the rear oil gallery plugs.

    9. Object Number: 471133 Size: SH
  9. Remove the front oil gallery plugs.

    10. Object Number: 471138 Size: SH
  10. Remove the left side oil gallery plugs.

    11. Object Number: 471137 Size: SH
  11. Remove the top oil gallery plugs.

    12. Object Number: 635657 Size: SH
  12. Remove the engine coolant hole plug.

    13. Object Number: 635660 Size: SH
  13. Remove the engine block heater, if equipped.

Engine Block Plug Removal Medium Duty

Tools Required

J 41712 Oil Pressure Sending Unit Socket


    Object Number: 471089 Size: SH
  1. Remove the oil pressure switch using J 41712 .

    2. Object Number: 471118 Size: SH

    Important: Use care not to damage the camshaft bearings.

  2. Remove the camshaft rear bearing hole plug:
    3. 2.1. Obtain a suitable self-threading screw.
    2.2. Drill a hole into the plug.
    2.3. Install the self-threading screw.
    2.4. Pull on the plug until it has left the bore.
    2.5. An alternate method to remove the plug would be to insert a long shaft or bar through the front of the engine and drive the plug from the bore.

    Object Number: 648528 Size: SH
  3. Remove the left side knock sensor shield bolts.
  4. Remove the left side knock sensor shield.

    5. Object Number: 648525 Size: SH
  5. Remove the left side knock sensor.

    6. Object Number: 471076 Size: SH
  6. Remove the right side knock sensor.

    7. Object Number: 471126 Size: SH
  7. Remove the engine block oil cooler hose fittings.

    8. Object Number: 471134 Size: SH
  8. Remove the rear oil gallery plugs.

    9. Object Number: 471133 Size: SH
  9. Remove the front oil gallery plugs.

    10. Object Number: 471138 Size: SH
  10. Remove the left side oil gallery plugs.

    11. Object Number: 471137 Size: SH
  11. Remove the top oil gallery plugs.

    12. Object Number: 635657 Size: SH
  12. Remove the engine coolant hole plug.

    13. Object Number: 635660 Size: SH
  13. Remove the engine block heater, if equipped.