GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2006 🢒 LaCrosse 🢒 Engine 🢒 Engine Mechanical - 3.6L 🢒 Cylinder Head Replacement - Left Side

Removal Procedure
  1. Remove the left bank secondary timing chain. Refer to Secondary Camshaft Drive Chain Replacement - Left Side .
  2. Remove the oil level indicator. Refer to Oil Level Indicator and Tube Replacement .

    3. Object Number: 945424 Size: SH
  3. Remove the heat shield from the coolant temperature sensor and disconnect the coolant temperature sensor electrical connector.

    4. Object Number: 945431 Size: SH
  4. Remove the wiring harness ground from the cylinder head.
  5. Disconnect the wiring harness electrical connector located at the side of the cylinder head.
  6. Remove the wiring harness connector bracket from the side of the cylinder head.

    7. Important: DO NOT disconnect the power steering pipes and/or hoses.

  7. Remove the power steering pump bolts.
  8. Remove the surge tank hose from the bracket at the rear of the cylinder head.
  9. Remove the wiring harness bracket from the rear of the cylinder head.
  10. Remove the catalytic converter. Refer to Catalytic Converter Replacement .

    11. Important: Do not remove the oil filter adapter.

  11. Remove the oil filter adapter upper bolt.
  12. Remove the secondary timing chain. Refer to Secondary Camshaft Drive Chain Removal - Left Side .

    13. Object Number: 902815 Size: SH
  13. Remove the cylinder head with the exhaust manifold. Refer to Cylinder Head Removal - Left Side .

    14. Object Number: 902814 Size: SH
  14. Remove and discard the cylinder head gasket.
  15. Clean and inspect the cylinder head and the engine block sealing surfaces. Refer to Cylinder Head Cleaning and Inspection and Engine Block Cleaning and Inspection .
  16. If necessary, perform the following steps:
    17. • Remove the exhaust manifold from the cylinder head. Refer to Exhaust Manifold Removal - Left Side .
    • Disassemble the cylinder head. Refer to Cylinder Head Disassemble .

Installation Procedure
  1. If necessary, perform the following steps:
    2. • Assemble the cylinder head. Refer to Cylinder Head Assemble .
    • Install the exhaust manifold to the cylinder head. Refer to Exhaust Manifold Installation - Left Side .

    Object Number: 902814 Size: SH
  2. Install a NEW cylinder head gasket.

    3. Object Number: 902815 Size: SH
  3. Carefully install the cylinder head with the exhaust manifold to the engine. Refer to Cylinder Head Installation - Left Side .
  4. Install the secondary timing chain. Refer to Secondary Camshaft Drive Chain Installation - Left Side .

    5. Notice: Refer to Fastener Notice in the Preface section.

  5. Install the oil filter adapter upper bolt.

    6. Tighten
    Tighten the oil filter housing adapter bolt to 23 N·m (17 lb ft).

  6. Install the oil level indicator. Refer to Oil Level Indicator and Tube Replacement .
  7. Install the catalytic converter to the exhaust manifold. Refer to Catalytic Converter Replacement .
  8. Install the wiring harness bracket to the rear of the cylinder head.
  9. Install the surge tank hose to the bracket at the rear of the cylinder head.
  10. Install the power steering pump bolts. Refer to Power Steering Pump Replacement .
  11. Install the wiring harness connector bracket to the side of the cylinder head.
  12. Connect the wiring harness electrical connector located at the side of the cylinder head.

    13. Object Number: 945431 Size: SH
  13. Install the wiring harness ground to the cylinder head.

    14. Tighten
    Tighten the wiring harness ground bolt to 10 N·m (89 lb in).


    Object Number: 945424 Size: SH
  14. Connect the coolant temperature sensor electrical connector and heat shield.
  15. Install the oil level indicator. Refer to Oil Level Indicator and Tube Replacement .
  16. Install the left bank secondary timing chain. Refer to Secondary Camshaft Drive Chain Replacement - Left Side .