GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Optra 🢒 Engine 🢒 Engine Mechanical - 1.8L (L79) 🢒 Timing Belt Inspection

Removal Procedure

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


    Object Number: 1289763 Size: SH
  1. Disconnect the negative battery cable.
  2. Disconnect the intake air temperature (IAT) sensor connector.
  3. Remove the air cleaner outlet hose from the throttle body.
  4. Remove the breather tube from the camshaft cover.

    5. Object Number: 1289768 Size: SH
  5. Remove the air cleaner housing bolts.
  6. Remove the air cleaner housing.
  7. Remove the right front wheel. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  8. Remove the right front wheel well splash shield. Refer to Wheelhouse Splash Shield Replacement in Body Front End.

    9. Object Number: 1289772 Size: SH
  9. Remove the serpentine accessory drive belt. Refer to Power Steering Pump Belt Replacement in Power Steering System.
  10. Remove the crankshaft pulley bolts.
  11. Remove the crankshaft pulley.
  12. Remove the right engine mount bracket. Refer to Engine Mount Replacement .

    13. Object Number: 1289773 Size: SH
  13. Remove the front timing belt cover bolts.
  14. Remove the front timing belt cover.

    15. Object Number: 1289785 Size: SH
  15. Rotate the crankshaft at least one full turn clockwise using the crankshaft gear bolt.
  16. Align the mark on the crankshaft gear with the notch at the bottom of the rear timing belt cover.

Adjustment Procedure

    Object Number: 1289784 Size: SH
  1. Align the camshaft gear timing marks. Use the exhaust gear mark (2) for the exhaust gear and the intake gear mark (1) for the intake gear, since the gear are interchangeable.

    2. Object Number: 1289788 Size: SH
  2. Loosen the automatic tensioner bolt. To relieve the belt tension, turn the hex-key tab counterclockwise.
  3. Rotate the automatic tensioner hex-key tab clock wise until the adjust arm pointer of the timing belt automatic tensioner is aligned with the notch in the timing belt automatic tensioner bracket.

    4. Object Number: 1289785 Size: SH
  4. Tighten the automatic tensioner bolt.
  5. Rotate the crankshaft two full turns clockwise using the crankshaft gear bolt.
  6. Check the automatic tensioner pointer.

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


    Object Number: 1289788 Size: SH
  7. When the adjust arm pointer of the timing belt automatic tensioner is aligned with the notch on the timing belt automatic tensioner bracket, the belt is tensioned correctly.

    8. Tighten
    Tighten the automatic tensioner bolt to 25 N·m (18 lb ft).

Installation Procedure

    Object Number: 1289773 Size: SH
  1. Install the front timing belt cover.
  2. Install the front timing belt cover bolts.

    3. Tighten
    Tighten the front timing belt cover bolts to 6 N·m (53 lb in).


    Object Number: 1289772 Size: SH
  3. Install the crankshaft pulley.
  4. Install the crankshaft pulley bolt.

    5. Tighten
    Tighten the crankshaft pulley bolt to 20 N·m (15 lb ft).

  5. Install the right engine mount bracket. Refer to Engine Mount Replacement .
  6. Install the serpentine accessory drive belt. Refer to Power Steering Pump Belt Replacement in Power Steering System.

    7. Object Number: 1289763 Size: SH
  7. Install the right front wheel well splash shield. Refer to Wheelhouse Splash Shield Replacement in Body Front End.
  8. Install the right front wheel. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  9. Install the air cleaner housing.
  10. Install the air cleaner housing bolts.

    11. Tighten
    Tighten the air cleaner housing bolts to 10 N·m (89 lb in).

  11. Connect the air cleaner outlet hose to the throttle body.

    12. Object Number: 1289768 Size: SH
  12. Connect the breather tube to the camshaft cover.
  13. Connect the IAT sensor connector.
  14. Connect the negative battery cable.