GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 343916  Size: SH
  1. Evacuate the air conditioning system, if equiped. Refer to Refrigerant Recovery and Recharging in AC.
  2. Disconnect the battery negative cable. Refer to Battery Cable Replacement in Engine Electrical.
  3. Drain the engine oil. Refer to Engine Oil and Oil Filter Replacement .
  4. Remove the valve rocker arms and push rods. Refer to Valve Rocker Arm and Push Rod Installation .
  5. Remove the lower intake manifold. Refer to Intake Manifold Replacement .
  6. Remove the valve lifters. Refer to Valve Lifter Removal .
  7. Remove the engine cooling fan and the fan shroud. Refer to Fan Clutch Replacement in Engine Cooling.
  8. Remove the radiator grille. Refer to Grille Replacement in Body.
  9. Remove the hood latch bracket. Refer to Hood Primary and Secondary Latch Replacement in Body.
  10. Remove the radiator. Refer to Radiator Replacement in Engine Cooling.
  11. Remove the A/C condenser, if equipped. Refer to Condenser Replacement in HVAC.
  12. Remove the water pump. Refer to Water Pump Replacement in Engine Cooling.
  13. Remove the three crankshaft pulley bolts and the crankshaft pulley. Refer to Crankshaft Balancer Replacement .
  14. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
  15. Remove the oil pan. Refer to Oil Pan Replacement .
  16. Lower the vehicle.
  17. Remove the engine front cover. Refer to Engine Front Cover Replacement .
  18. Remove the crankshaft position sensor reluctor ring. Refer to Crankshaft Position Sensor Reluctor Ring Replacement .

  19. Object Number: 344371  Size: SH
  20. Rotate the number one piston to Top Dead Center (TDC).
  21. Align the timing marks on the camshaft and the crankshaft sprockets.

  22. Object Number: 182836  Size: SH
  23. Remove the camshaft sprocket bolts.
  24. Remove the camshaft sprocket and the timing chain. Refer to Timing Chain and Sprockets Removal .
  25. Remove the camshaft retainer plate and bolts using a T-30 TORX® socket.

  26. Object Number: 344428  Size: SH

    Important: All camshaft journals are the same diameter, so care must be used in removing the camshaft to avoid damage to the bearings.

  27. Remove the camshaft. Refer to Camshaft Removal .
  28. Clean all sealing surfaces.
  29. Inspect all parts for wear. Refer to Camshaft and Bearings Clean and Inspect .

Installation Procedure


    Object Number: 344428  Size: SH
  1. Install the camshaft. Refer to Camshaft Installation .
  2. Install the components removed from the front of the engine. Refer to Timing Chain and Sprockets Installation .
  3. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
  4. Install the fasteners to the oil pan. Refer to Oil Pan Replacement .
  5. Lower the vehicle.

  6. Object Number: 4065  Size: SH
  7. Use the J 23523-F in order to install the crankshaft balancer.
  8. Refer to Crankshaft Balancer Installation

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  9. Install the crankshaft pulley in the following manner:
  10. Install the pulley and the three bolts.
  11. Install the crankshaft balancer bolt.
  12. Tighten
    Tighten the pulley bolts to 58 N·m (43 lb ft).

    Tighten the crankshaft balancer bolt to 100 N·m (74 lb ft).

  13. Install the water pump. Refer to Water Pump Replacement in Engine Cooling.
  14. Install the A/C condenser, if equipped. Refer to Condenser Replacement in HVAC.
  15. Install the radiator. Refer to Radiator Replacement
  16. Install the hood latch bracket. Refer to Hood Primary and Secondary Latch Replacement in Body.
  17. Install the radiator grille. Refer to Grille Replacement in Body.
  18. Install the engine cooling fan and the upper fan shroud. Refer to Fan Clutch Replacement in Engine Cooling.
  19. Install the valve lifters. Refer to Valve Lifter Installation .
  20. Install the lower intake manifold. Refer to Intake Manifold Installation .
  21. Install the valve rocker arms and push rods. Refer to Valve Rocker Arm and Push Rod Installation .
  22. Connect the battery negative cable. Refer to Battery Cable Replacement in Engine Electrical.
  23. Replace the engine oil filter. Refer to Engine Oil and Oil Filter Replacement .