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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1018 (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 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Tools Required 

J 41712  Oil Pressure Switch Socket

    CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.
  1. Remove the knock sensor retaining bolt (1).
  2. Remove the knock sensor (2).
  3. Fig 1: Locating Knock Sensor & Retaining Bolt
    GM679284Courtesy of GENERAL MOTORS CORP.
  4. Remove the engine oil pressure gage sensor using the J 41712  .
  5. Fig 2: Removing Engine Oil Pressure Gage Sensor
    GM188018Courtesy of GENERAL MOTORS CORP.
  6. Remove the engine oil pressure sensor fitting.
  7. Fig 3: Removing Engine Oil Pressure Sensor Fitting
    GM188020Courtesy of GENERAL MOTORS CORP.
  8. Remove the transmission locator dowel straight pins, if required.
  9. Fig 4: Removing Transmission Locator Dowel Straight Pins
    GM334350Courtesy of GENERAL MOTORS CORP.
  10. Remove the engine block left side oil gallery plug.
  11. Remove the engine block left rear oil gallery plug.
  12. Remove the engine block right rear oil gallery plug.
  13. Fig 5: Removing Engine Block Oil Gallery Plugs
    GM5271Courtesy of GENERAL MOTORS CORP.
  14. Remove the expansion cup plug from the camshaft rear bearing hole and discard.
  15. Fig 6: Removing Expansion Cup Plug From Camshaft Rear Bearing Hole
    GM334364Courtesy of GENERAL MOTORS CORP.
  16. Remove the expansion cup plug from the balance shaft rear bearing hole and discard.
  17. Fig 7: Removing Expansion Cup Plug From Balance Shaft Rear Bearing Hole
    GM334366Courtesy of GENERAL MOTORS CORP.
  18. Remove the crankshaft rear oil seal housing locator spring type S pin, if required.
  19. Fig 8: Removing Crankshaft Rear Oil Seal Housing Locator Spring
    GM334323Courtesy of GENERAL MOTORS CORP.
  20. 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.

  21. Fig 9: Removing Front Oil Gallery Plugs From Engine Block
    GM5270Courtesy of GENERAL MOTORS CORP.
  22. 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.
  23. Fig 10: Removing Engine Block Core Hole Plugs
    GM480550Courtesy of GENERAL MOTORS CORP.
  24. Remove the oil filter bypass valve and discard.
  25. Fig 11: Removing Oil Filter Bypass Valve
    GM188026Courtesy of GENERAL MOTORS CORP.