GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Optra 🢒 Engine 🢒 Engine Mechanical - 2.0L (L34 GMDAT) 🢒 Camshaft Gear Replacement

Tools Required

    • J 45059 Angle Meter
    • KM-470-B Angular Torque Gage

Removal Procedure

    Caution: Refer to Battery Disconnect Caution in the Preface section.


    Object Number: 1289763 Size: SH
  2. Disconnect the negative battery cable.
  3. Remove the timing belt. Refer to Timing Belt Replacement .
  4. Remove the spark plug cover bolts.
  5. Remove the spark plug cover.
  6. Disconnect the ignition wires from the spark plugs.
  7. Disconnect the crankcase breather tubes from the valve cover.

    8. Object Number: 1252112 Size: SH
  8. Remove the valve cover bolts.
  9. Remove the valve cover washers.
  10. Remove the valve cover and the valve cover gasket.

    11. Caution: Refer to Safety Glasses Caution in the Preface section.


    Object Number: 1252121 Size: SH

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

  11. While holding the intake camshaft firmly in place, remove the intake camshaft gear bolt.
  12. Remove the intake camshaft gear.
  13. Remove the camshaft position (CMP) sensor. Refer to Camshaft Position Sensor Replacement .
  14. Remove the coolant pump. Refer to Coolant Pump Replacement .
  15. While holding the exhaust camshaft firmly in place, remove the exhaust camshaft gear bolt.
  16. Remove the exhaust camshaft gear.

Installation Procedure

    Object Number: 1252121 Size: SH

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

  1. Install the intake camshaft gear.

    2. Notice: Refer to Camshaft Journal Diameter Notice in the Preface section.

    Notice: Refer to Fastener Notice in the Preface section.

  2. While holding the intake camshaft firmly in place, install the intake camshaft gear bolt.

    3. Tighten
    Tighten the intake camshaft gear bolt to 50 N·m (37 lb ft). Turn another 60 degrees plus 15 degrees using the J 45059 or the KM-470-B .

  3. Install the coolant pump. Refer to Coolant Pump Replacement .
  4. Install the CMP sensor. Refer to Camshaft Position Sensor Replacement .
  5. Install the exhaust camshaft gear.
  6. While holding the exhaust camshaft firmly in place, install the exhaust camshaft gear bolt.

    7. Tighten
    Tighten the exhaust camshaft gear bolt to 50 N·m (37 lb ft). Turn another 60 degrees plus 15 degrees using the J 45059 or the KM-470-B .


    Object Number: 1252112 Size: SH
  7. Apply a small amount of gasket sealant to the corners of the front camshaft caps and to the top of the rear valve cover-to-cylinder head seal.
  8. Install the valve cover and the valve cover gasket.
  9. Install the valve cover washers.
  10. Install the valve cover bolts.

    11. Tighten
    Tighten the valve cover bolts to 8 N·m (71 lb in).


    Object Number: 1289763 Size: SH
  11. Connect the crankcase breather tubes to the valve cover.
  12. Connect the ignition wires to the spark plugs.
  13. Install the spark plug cover.
  14. Install the spark plug cover bolts.

    15. Tighten
    Tighten the spark plug cover bolts to 8 N·m (71 lb in).

  15. Install the timing belt. Refer to Timing Belt Replacement .
  16. Connect the negative battery cable.