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

Removal Procedure

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


    Object Number: 1289768 Size: SH
  1. Disconnect the negative battery cable.
  2. Disconnect the intake air temperature (IAT) sensor.
  3. Disconnect the air intake tube from the throttle body.
  4. Disconnect the breather tube from the valve cover.

    5. Object Number: 1289819 Size: SH
  5. Remove the air cleaner housing bolts.
  6. Remove the air cleaner.
  7. Remove the right front wheel. Refer to Tire and Wheel Removal and Installation .
  8. Remove the right front wheel well splash shield. Refer to Wheelhouse Splash Shield Replacement .

    9. Notice: Refer to Belt Dressing Notice in the Preface section.


    Object Number: 1252119 Size: SH
  9. Remove the power steering pump drive belt. Refer to Power Steering Pump Belt Replacement .
  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: 1252120 Size: SH
  13. Remove the front timing cover bolts.
  14. Remove the front timing belt cover.

    15. Object Number: 1252132 Size: SH
  15. Using the crankshaft gear bolt, rotate the crankshaft clockwise until the timing mark on the crankshaft gear is aligned with the notch at the bottom of the rear timing belt cover.

    16. Object Number: 1252131 Size: SH

    Important: The camshaft gears must align with the notch on the valve cover or damage to the engine could result.

    Important: Use the intake gear mark for the intake camshaft gear and the exhaust gear (1) mark for the exhaust camshaft gear (2) since both gears are interchangeable.

  16. Align the camshaft gears with the notch on the valve cover.

    17. Object Number: 1252133 Size: SH
  17. Loosen the automatic tensioner bolt. Turn the hex key tab to relieve the belt tension.
  18. Remove the timing belt.

Installation Procedure

    Object Number: 1252132 Size: SH
  1. Align the timing mark on the crankshaft gear with the notch on the bottom of the rear timing belt cover.

    2. Object Number: 1252131 Size: SH
  2. Align the timing marks on the camshaft gears, using the intake gear mark for the intake gear (1) and the exhaust gear mark for the exhaust gear (2).

    3. Object Number: 1252133 Size: SH
  3. Install the timing belt.

    4. Object Number: 1252138 Size: SH
  4. Turn the hex-key tab in a counterclockwise direction to tension the belt. Turn until the pointer aligns with the notch.

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

  5. Install the automatic tensioner bolt.

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

  6. Rotate the crankshaft 2 full turns clockwise using the crankshaft gear bolt.
  7. Inspect the automatic tensioner pointer.

    8. Object Number: 1252120 Size: SH
  8. Install the front timing belt cover.
  9. Install the front timing belt cover bolts.

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

  10. Install the right engine mount bracket. Refer to Engine Mount Replacement .

    11. Object Number: 1252119 Size: SH
  11. Install the crankshaft pulley.
  12. Install the crankshaft pulley bolts.

    13. Tighten
    Tighten the crankshaft pulley bolts to 20 N·m (15 lb ft).

    Notice: Refer to Belt Dressing Notice in the Preface section.

  13. Install the power steering pump drive belt. Refer to Power Steering Pump Belt Replacement .
  14. Install the right front wheel well splash shield. Refer to Wheelhouse Splash Shield Replacement .
  15. Install the right front wheel. Refer to Tire and Wheel Removal and Installation .

    16. Object Number: 1289768 Size: SH
  16. Install the air filter housing.
  17. Install the air filter housing bolts.

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

  18. Connect the air intake tube to the throttle body.
  19. Connect the breather tube to the valve cover.
  20. Connect the IAT sensor connector.
  21. Connect the negative battery cable.