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Home >> Buick >> 2004 >> Century Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 87 (Engine Mechanical - 3.8L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Cylinder Head Replacement - Right >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  2. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement (L36)  or Fuel Injector Sight Shield Replacement (L67) .
  3. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  4. Drain the cooling system. Refer to Draining and Filling Cooling System in Engine Cooling.
  5. Drain the engine oil. Refer to Engine Oil and Oil Filter Replacement .
  6. Remove the catalytic converter from the right exhaust manifold. Refer to Catalytic Converter Replacement (3.1L) or Catalytic Converter Replacement (3.8L) in Engine Exhaust.
    7. Fig 1: EGR Valve Adapter Bolt
    GM190557Courtesy of GENERAL MOTORS CORP.
  7. Remove the exhaust gas recirculation (EGR) valve adapter bolt from the right exhaust manifold.
  8. Lower the vehicle.
  9. Remove the drive belt tensioner. Refer to Drive Belt Tensioner Replacement .
    10. Fig 2: View Of Power Steering Pump And Mounting Bolts
    GM282122Courtesy of GENERAL MOTORS CORP.
  10. Remove the power steering pump bolts and reposition the power steering pump.
  11. Rotate the engine to access the right cylinder head. Refer to Rotating the Engine for Service Access .
  12. Remove the right spark plugs from the right cylinder head. Refer to Spark Plug Replacement in Engine Controls - 3.8L.
    13. Fig 3: HO2S Sensor Electrical Connector (3.8L)
    GM371512Courtesy of GENERAL MOTORS CORP.
  13. Disconnect the heated oxygen sensor (HO2S) electrical connector (4).
  14. Remove the lower intake manifold. Refer to Intake Manifold Replacement - Lower (L36)  or Intake Manifold Replacement - Lower (L67) .
    15. Fig 4: EGR Valve & Nuts
    GM190555Courtesy of GENERAL MOTORS CORP.
  15. Remove the EGR valve nuts.
  16. Remove the EGR valve.
    17. Fig 5: EGR Valve Adapter & Bolts
    GM190558Courtesy of GENERAL MOTORS CORP.
  17. Remove the EGR valve adapter bolts from the right cylinder head.
  18. Remove the EGR valve adapter from the right cylinder head.
    19. Fig 6: Right Engine Lift Bracket (3.8L)
    GM153580Courtesy of GENERAL MOTORS CORP.
  19. Remove the right engine lift bracket bolt and the nut.
  20. Remove the right engine lift bracket.
  21. Remove the exhaust crossover pipe. Refer to Exhaust Crossover Pipe Replacement (3.1L) or Exhaust Crossover Pipe Replacement (3.8L) in Engine Exhaust.
  22. Remove the right exhaust manifold. Refer to Exhaust Manifold Replacement - Right (3.1L) or Exhaust Manifold Replacement - Right (3.8L) in Engine Exhaust.
  23. Remove the right valve rocker arm cover. Refer to Valve Rocker Arm Cover Replacement - Right .
  24. Remove the right rocker arms and push rods. Refer to Valve Rocker Arm and Push Rod Replacement .
    25. Fig 7: Right Cylinder Head & Bolts
    GM153598Courtesy of GENERAL MOTORS CORP.
  25. Remove the right cylinder head bolts. Discard the cylinder head bolts.
  26. Remove the right cylinder head.
    27. Fig 8: Right Cylinder Head Gasket
    GM190560Courtesy of GENERAL MOTORS CORP.
  27. Remove the cylinder head gasket.
  28. Remove the caps, the springs, the valves and the seals from the cylinder head. Refer to Cylinder Head Disassemble .
  29. Clean the gasket mating surfaces on the cylinder head, the engine block and the intake manifold.
  30. Clean the cylinder block bolt hole threads.
  31. Inspect the engine block. Refer to Engine Block Cleaning and Inspection .
  32. Inspect the cylinder head. Refer to Cylinder Head Cleaning and Inspection .
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