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Home >> Buick >> 2002 >> Century Limited >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical - 3.1L V6 - VIN (J) (On-Vehicle) >> Repair Instructions >> Cylinder Head Replacement - Left >> Removal Procedure

Removal Procedure

  1. Raise and support the vehicle.
  2. Drain the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM in ENGINE COOLING SYSTEM .
  3. Drain the engine oil. Refer to Engine Oil and Oil Filter Replacement .
  4. Lower the vehicle.
  5. Remove the lower intake manifold. Refer to Intake Manifold Replacement - Lower .
  6. Remove the valve rocker arms and the pushrods. Refer to Valve Rocker Arm and Push Rod Replacement .
    7. Fig 1: Valve Rocker Arms And The Pushrods
    G01763649Courtesy of GENERAL MOTORS CORP.
  7. Remove the exhaust crossover pipe. Refer to EXHAUST CROSSOVER PIPE REPLACEMENT (3.1L) in AUTOMATIC TRANSAXLE SERVICING .
  8. Remove the right engine mount strut bracket. Refer to Engine Mount Strut Bracket Replacement - Right .
  9. Remove the oil level indicator tube. Refer to Oil Level Indicator and Tube Replacement .
  10. Remove the left spark plug wires from the spark plugs. Refer to SPARK PLUG WIRE REPLACEMENT in ENGINE CONTROLS - REMOVAL & INSTALLATION, OVERHAUL .
  11. Remove the left spark plugs. Refer to SPARK PLUGS .
  12. Remove the left exhaust manifold. Refer to EXHAUST MANIFOLD REPLACEMENT - LEFT (3.1L) in AUTOMATIC TRANSAXLE SERVICING .
  13. Remove the left cylinder head bolts.
  14. Remove the left cylinder head.
  15. Remove the left cylinder head gasket.
  16. Clean the following areas:
    • The gasket mating surfaces on the cylinder head, cylinder block, and intake manifolds.
    • The cylinder block bolt threads.
    • The cylinder head bolts.
    Fig 2: Cylinder Head Gasket
    G01763650Courtesy of GENERAL MOTORS CORP.
  17. Clean and inspect the cylinder head. Refer to CYLINDER HEAD CLEANING AND INSPECTION .
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