GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Remove the battery. Refer to Battery Replacement .
  2. Remove the battery tray. Refer to Battery Tray Replacement .
  3. Drain the engine coolant. Refer to Cooling System Draining and Filling .
  4. Remove the upper radiator hose.
  5. Remove the exhaust gas recirculation (EGR) valve. Refer to Exhaust Gas Recirculation Valve Replacement .
  6. Remove the left rocker arm cover. Refer to Valve Rocker Arm Cover Replacement - Left Side .
  7. Remove the left camshaft drive sprocket. Refer to Camshaft Drive Sprocket Replacement - Left Side .

  8. Object Number: 897125  Size: SH
  9. Alternately loosen the rocker shaft retaining bolts a few turns at a time using the loosening sequence.
  10. Remove the rocker arm and shaft assembly.

  11. Object Number: 897133  Size: SH
  12. Remove the rear camshaft cap, bolts, and O-ring.
  13. Remove the camshaft from the cylinder head.
  14. Remove the camshaft seal.
  15. Clean all of the bearing surfaces.
  16. Clean all of the sealing surfaces.
  17. Clean and inspect the camshafts. Refer to Camshafts Cleaning and Inspection .

Installation Procedure


    Object Number: 897133  Size: SH
  1. Lubricate the camshaft journals and bores with clean engine oil.
  2. Notice: Refer to Fastener Notice in the Preface section.

  3. Install the camshaft, NEW O-ring, cap, and bolts.
  4. Tighten
    Tighten the bolts to 22 N·m (16 lb ft).

  5. Install a new camshaft seal. Refer to Camshaft Front Oil Seal Replacement .

  6. Object Number: 897125  Size: SH
  7. Install the rocker arm and shaft assembly. Refer to Valve Rocker Arm and Shaft Replacement .
  8. Install the left camshaft drive sprocket. Refer to Camshaft Drive Sprocket Replacement - Left Side .
  9. Install the left rocker arm cover. Refer to Valve Rocker Arm Cover Replacement - Left Side .
  10. Install the EGR valve. Refer to Exhaust Gas Recirculation Valve Replacement .
  11. Install the upper radiator hose.
  12. Fill the radiator with engine coolant. Refer to Cooling System Draining and Filling .
  13. Install the battery tray. Refer to Battery Tray Replacement .
  14. Install the battery. Refer to Battery Replacement .