GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2007 🢒 Optra 🢒 Engine 🢒 Engine Mechanical - 1.4L DOHC 🢒 Exhaust Manifold Replacement

Removal Procedure

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


    Object Number: 1371869 Size: SH
  1. Disconnect the negative battery cable.
  2. Disconnect the pre-converter oxygen sensor connector.
  3. Remove the exhaust manifold heat shield bolts.
  4. Remove the exhaust manifold heat shield.

    5. Object Number: 1371881 Size: SH
  5. Remove the auxiliary catalytic converter nuts from the exhaust manifold.

    6. Object Number: 1371921 Size: SH
  6. Remove the exhaust manifold retaining nuts in the sequence shown.
  7. Remove the exhaust manifold.
  8. Remove the exhaust manifold gasket.

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

  9. Clean the sealing surfaces of the exhaust manifold and the cylinder head.

Installation Procedure

    Object Number: 1371922 Size: SH
  1. Install the exhaust manifold gasket.
  2. Install the exhaust manifold.

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

  3. Install the exhaust manifold retaining nuts and tighten them in the sequence shown.

    4. Tighten
    Tighten the exhaust manifold retaining nuts 25 N·m (18 lb ft).


    Object Number: 1371881 Size: SH
  4. Install the auxiliary catalytic converter nuts to the exhaust manifold.

    5. Tighten
    Tighten the auxiliary catalytic converter-to-exhaust manifold nuts to 40 N·m (30 lb ft).


    Object Number: 1371869 Size: SH
  5. Install the exhaust manifold heat shield.
  6. Install the exhaust manifold heat shield bolts.

    7. Tighten
    Tighten the exhaust manifold heat shield bolts to 15 N·m (11 lb ft).

  7. Connect the pre-converter oxygen sensor connector.
  8. Connect the negative battery cable.