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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 144 (Engine Mechanical - 4.3L) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Engine Block Plug Removal

Engine Block Plug Removal

WARNING: This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

Tools Required 

J 41712  Oil Pressure Switch Socket

WARNING: Wear safety glasses in order to avoid eye damage.
  1. Remove the knock sensor retaining bolt (1).
  2. Remove the knock sensor (2).
    Fig 1: Removing Retaining Bolt & Knock Sensor
    G02078034Courtesy of GENERAL MOTORS CORP.
  3. Remove the engine oil pressure gage sensor using the J 41712  .
    Fig 2: Removing Engine Oil Pressure Gage Sensor Using J 41712
    G02078035Courtesy of GENERAL MOTORS CORP.
  4. Remove the engine oil pressure sensor fitting.
    Fig 3: Removing Engine Oil Pressure Sensor Fitting
    G02078036Courtesy of GENERAL MOTORS CORP.
  5. Remove the transmission locator dowel straight pins, if required.
    Fig 4: Removing Transmission Locator Dowel Straight Pins
    G02078037Courtesy of GENERAL MOTORS CORP.
  6. Remove the engine block left side oil gallery plug.
  7. Remove the engine block left rear oil gallery plug.
  8. Remove the engine block right rear oil gallery plug.
    Fig 5: Removing Engine Block Oil Gallery Plugs
    G02078038Courtesy of GENERAL MOTORS CORP.
  9. Remove the expansion cup plug from the camshaft rear bearing hole and discard.
    Fig 6: Removing Expansion Cup Plug From Camshaft Rear Bearing Hole
    G02078039Courtesy of GENERAL MOTORS CORP.
  10. Remove the expansion cup plug from the balance shaft rear bearing hole and discard.
    Fig 7: Removing Expansion Cup Plug From Balance Shaft Rear Bearing Hole
    G02078040Courtesy of GENERAL MOTORS CORP.
  11. Remove the crankshaft rear oil seal housing locator spring type S pin, if required.
    Fig 8: Removing Crankshaft Rear Oil Seal Housing Locator Spring Type S Pin
    G02078041Courtesy of GENERAL MOTORS CORP.
  12. Remove the front oil gallery plugs or balls from the front of the engine block and discard.

    Insert a 3/8 x 26 inch rod into the rear oil gallery holes in order to drive out the front oil gallery plugs or balls.

    Fig 9: Removing Front Oil Gallery Plugs Or Balls
    G02078042Courtesy of GENERAL MOTORS CORP.
  13. Remove the engine block core hole plugs.
    1. Use a suitable tool in order to drive the engine block core hole plugs into the coolant jacket.
    2. Use a suitable tool in order to pull the engine block core hole plugs from the coolant jacket.
    3. Discard the engine block core hole plugs.
      Fig 10: Removing Engine Block Core Hole Plugs
      G02078043Courtesy of GENERAL MOTORS CORP.
  14. Remove the oil filter bypass valve and discard.
    Fig 11: Removing Oil Filter Bypass Valve
    G02078044Courtesy of GENERAL MOTORS CORP.