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Home >> GMC >> 2003 >> Yukon Denali >> Repair and Diagnosis >> External Pages >> Different car >> Section 521 (Engine Mechanical (Repair Instructions -- 2 Of 3) -- 4.8L, 5.3L & 6.0L) >> Repair Instructions (Off-Vehicle - Part 2) >> Engine Block Plug Removal

Engine Block Plug Removal

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Tools Required 

J 41712  Oil Pressure Switch Socket

    IMPORTANT:
    • Do not remove the engine block front oil gallery plug unless service is required.
    • If the front oil gallery plug is removed for service, a NEW oil gallery plug must be installed.
  1. Remove the oil pressure sensor, if not previously removed, using the J 41712  or equivalent.
    2. Fig 1: View Of Oil Pressure Sensor & J 41712
    GM823316Courtesy of GENERAL MOTORS CORP.
  2. Remove the engine block right rear coolant drain hole plug.
    3. Fig 2: Identifying Plug Location On Underside Of Block
    GM63164Courtesy of GENERAL MOTORS CORP.
  3. Remove the engine block coolant heater, if applicable.
    4. Fig 3: View Of Engine Block Coolant Heater
    GM1276785Courtesy of GENERAL MOTORS CORP.
  4. Remove the engine block left front coolant drain hole plug, if applicable.
    5. Fig 4: View Of Engine Block Left Front Coolant Drain Hole Plug
    GM63165Courtesy of GENERAL MOTORS CORP.
  5. Remove the engine block left front oil gallery plug.
    6. Fig 5: View Of Engine Block Left Front Oil Gallery Plug
    GM260139Courtesy of GENERAL MOTORS CORP.
  6. Remove the engine block left rear oil gallery plug.
    7. Fig 6: View Of Engine Block Left Rear Oil Gallery Plug
    GM64923Courtesy of GENERAL MOTORS CORP.
  7. Inspect the block plug sealing washers.

    If the block plug and heater sealing washers are not damaged, they may be used during assembly.

  8. Remove the engine block rear oil gallery plug.
  9. Inspect the O-ring seal of the rear oil gallery plug.

    If the O-ring seal is not cut or damaged, the plug and O-ring seal may be used during assembly.

    10. Fig 7: View Of Engine Block Rear Oil Gallery Plug
    GM63228Courtesy of GENERAL MOTORS CORP.
    IMPORTANT:
    • Remove the front oil gallery plug only if service is required.
    • If the front oil gallery plug is removed, a NEW oil gallery plug must be installed.
  10. Remove the engine block front oil gallery plug.
    11. Fig 8: View Of Engine Block Front Oil Gallery Plug
    GM64295Courtesy of GENERAL MOTORS CORP.
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