GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2009 🢒 Optra 🢒 Engine 🢒 Engine Mechanical - 1.8L (L79) 🢒 Camshaft Replacement

Removal Procedure

    Object Number: 1289764 Size: SH
  1. Remove the timing belt. Refer to Timing Belt Replacement.
  2. Disconnect the breather tube at the camshaft cover.
  3. Disconnect the engine ventilation hose at the camshaft cover.
  4. Remove the spark plug cover bolts.
  5. Remove the spark plug cover.
  6. Disconnect the ignition wires from the spark plugs.
  7. Remove the camshaft cover bolts.
  8. Remove the camshaft cover washers.
  9. Remove the camshaft cover and the camshaft cover gasket.

    10. Object Number: 1289774 Size: SH

    Important: Take extreme care to prevent any scratches, nicks or damage to the camshafts.

  10. While holding the intake camshaft firmly in place, remove the intake camshaft gear bolt.
  11. Remove the intake camshaft gear.
  12. While holding the exhaust camshaft firmly in place, remove the exhaust camshaft gear bolt.
  13. Remove the exhaust camshaft gear.

    14. Object Number: 1289786 Size: SH
  14. Loosen the camshaft bearing cap bolts in stages of one-half to one turn.
  15. Remove the camshaft bearing cap bolts from the cylinder head.
  16. Remove the camshafts.
  17. Remove the seal ring from the camshafts.

    18. Important: The camshaft must detach evenly from the bearing seats in the front guide bearing.

  18. Check the camshaft and bearing seats for wear and replace them if necessary.

Installation Procedure

    Object Number: 1289787 Size: SH

    Important: Take extreme care to prevent any scratches, nicks or damage to the camshafts.

  1. Lubricate the camshaft journals and the camshaft caps with engine oil.
  2. Install the intake camshaft.
  3. Install the intake camshaft caps in their original positions.
  4. Install the intake camshaft cap bolts.
  5. Install the exhaust camshaft.
  6. Install the exhaust camshaft caps in their original positions.
  7. Install the exhaust camshaft cap bolts.

    8. Caution: Refer to Fastener Caution in the Preface section.

  8. Tighten the camshaft cap bolts gradually and in the sequence shown for each camshaft cap.

    9. Tighten
    Tighten the bolts to 8 N·m (71 lb in).


    Object Number: 1289783 Size: SH
  9. Measure the intake camshaft end play and the exhaust camshaft end play. Refer to Engine Mechanical Specifications.
  10. Install the intake camshaft gear.
  11. While holding the intake camshaft firmly in place, install the intake camshaft gear bolt.

    12. Tighten
    Tighten the bolt to 50 N·m (37 lb ft) plus 60 degrees and 15 degrees.

  12. Install the exhaust camshaft gear.
  13. While holding the exhaust camshaft firmly in place, install the exhaust camshaft gear bolt.

    14. Tighten
    Tighten the bolt to 50 N·m (37 lb ft) plus 60 degrees and 15 degrees.


    Object Number: 1289764 Size: SH
  14. Install the camshaft cover and the camshaft cover gasket.
  15. Install the camshaft cover washers.
  16. Install the camshaft cover bolts.

    17. Tighten
    Tighten the bolts to 8 N·m (71 lb in).


    Object Number: 1289763 Size: SH
  17. Connect the ignition wires to the spark plugs.
  18. Install the spark plug cover.
  19. Install the spark plug cover bolts.

    20. Tighten
    Tighten the bolts to 8 N·m (71 lb in).

  20. Connect the breather tube to the camshaft cover.
  21. Connect the engine ventilation hose to the camshaft cover.
  22. Install the timing belt. Refer to Timing Belt Replacement