GM Service Manual Online
For 1990-2009 cars only

Exhaust Seal Replacement LH8

Removal Procedure

Warning: Refer to Exhaust Service Warning in the Preface section.

Warning: Refer to Protective Goggles and Glove Warning in the Preface section.


    Object Number: 1902702  Size: SH
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  2. If removing the left side seal, remove the catalytic converter to exhaust manifold nuts (1).
  3. Position the catalytic converter rearward enough in order to allow clearance to remove the seal.
  4. Remove and discard the exhaust manifold seal (2).

  5. Object Number: 1902703  Size: SH
  6. If removing the right side seal, remove the catalytic converter to exhaust manifold nuts (2).
  7. Position the catalytic converter rearward enough in order to allow clearance to remove the seal.
  8. Remove and discard the exhaust manifold seal (1).

Installation Procedure


    Object Number: 1902703  Size: SH
  1. If the right side seal was removed, position the catalytic converter rearward enough in order to allow clearance to install the seal.
  2. Install a NEW exhaust manifold seal (1).
  3. Caution: Refer to Fastener Caution in the Preface section.

  4. Install the catalytic converter to exhaust manifold nuts (2).
  5. Tighten
    Tighten the nuts to 50 N·m (37 lb ft).


    Object Number: 1902702  Size: SH
  6. If removing the left side seal, position the catalytic converter rearward enough in order to allow clearance to install the seal.
  7. Install a NEW exhaust manifold seal (2).
  8. Install the catalytic converter to exhaust manifold nuts (1).
  9. Tighten
    Tighten the nuts to 50 N·m (37 lb ft).

  10. Lower the vehicle.
  11. Inspect for exhaust leaks.

Exhaust Seal Replacement LLR

Removal Procedure

Warning: Refer to Exhaust Service Warning in the Preface section.

Warning: Refer to Protective Goggles and Glove Warning in the Preface section.


    Object Number: 1313621  Size: SH
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  2. Remove the nuts attaching the catalytic converter to the exhaust manifold.
  3. Position the exhaust system rearward, enough to allow clearance to remove the seal.

  4. Object Number: 1313620  Size: SH
  5. Remove and discard the exhaust manifold seal.

Installation Procedure


    Object Number: 1313620  Size: SH
  1. Install a NEW seal to the exhaust manifold flange.

  2. Object Number: 1313621  Size: SH
  3. Position the catalytic converter to the exhaust manifold.
  4. Caution: Refer to Fastener Caution in the Preface section.

  5. Install the nuts attaching the catalytic converter to the exhaust manifold.
  6. Tighten
    Tighten the nuts to 50 N·m (37 lb ft).

  7. Lower the vehicle.