GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Optra 🢒 Engine 🢒 Engine Controls - 1.4L DOHC 🢒 Camshaft Replacement

Removal Procedure

    Object Number: 1371851 Size: SH
  1. Remove the timing belt. Refer to Timing Belt Replacement .

  2. Remove the spark plug cover bolts.
  3. Remove the spark plug cover.

    4. Object Number: 1371852 Size: SH
  4. Disconnect the breather tube from the valve cover.
  5. Disconnect the crankcase ventilation tube from the valve cover.

    6. Object Number: 1371854 Size: SH
  6. Disconnect the camshaft position (CMP) sensor connector.

    7. Object Number: 1371855 Size: SH
  7. Disconnect the ignition wires from the spark plugs.

    8. Object Number: 1371856 Size: SH
  8. Remove the valve cover bolts.
  9. Remove the valve cover and gasket.

    10. Object Number: 1371901 Size: SH

    Notice: Use extreme care when removing the camshaft not to nick, scratch, or damage the camshaft lobes or bearing surfaces.

  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: 1372404 Size: SH
  14. Remove the camshaft cap bolts gradually and in the sequence shown for each camshaft cap.

    15. Object Number: 1371902 Size: SH
  15. Remove the intake camshaft caps. Maintain the correct positions for installation.
  16. Remove the intake camshaft.
  17. Remove the exhaust camshaft caps. Maintaining the correct positions for installation.
  18. Remove the exhaust camshaft.

Installation Procedure

    Object Number: 1371902 Size: SH

    Notice: Use extreme care when installing the camshaft not to nick, scratch, or damage the camshaft lobes or bearing surfaces.

  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. Object Number: 1372404 Size: SH
  7. Install the exhaust camshaft cap bolts.

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

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

    9. Tighten
    Tighten the camshaft cap bolts to 16 N·m (12 lb ft).


    Object Number: 1371885 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 intake camshaft gear bolt to 67.5 N·m (49 lb ft).


    Object Number: 1371901 Size: SH
  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 exhaust camshaft gear bolt to 67.5 N·m (49 lb ft).


    Object Number: 1371856 Size: SH
  14. Install the valve cover and the valve cover gasket.
  15. Install the valve cover washers.
  16. Install the valve cover nuts.

    17. Tighten
    Tighten the valve cover nuts to 9 N·m (80 lb in).


    Object Number: 1371851 Size: SH
  17. Connect the ignition wires to the spark plugs.
  18. Connect the CMP sensor.
  19. Install the spark plug cover.
  20. Install the spark plug cover bolts.

    21. Tighten
    Tighten the spark plug cover bolts to 3 N·m (27 lb in).

  21. Install the oil filler cap.
  22. Connect the vacuum line.
  23. Connect the air breather tube to the valve cover.
  24. Install the timing belt. Refer to Timing Belt Replacement .