GM Service Manual Online
For 1990-2009 cars only

Exhaust Seal Replacement 3.4L

Removal Procedure

  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Notice: Refer to Catalytic Converter Movement Notice in the Preface section.


    Object Number: 372621  Size: SH

    Important: Use caution handling the pipe that contains an oxygen sensor. Do not cut the wire. For removal or repositioning disconnect the connector.

  3. Remove the right exhaust manifold pipe stud nuts from the exhaust manifold studs.
  4. Important: Suitably support the exhaust system where hangers are removed.

  5. In order to remove the exhaust seal disconnect any hangers necessary to reposition the exhaust system.
  6. Reposition the exhaust system.

  7. Object Number: 107855  Size: SH
  8. Remove the exhaust manifold pipe gasket.

Installation Procedure


    Object Number: 107855  Size: SH
  1. Install the exhaust manifold pipe gasket.

  2. Object Number: 372621  Size: SH
  3. Return the exhaust system to the proper position.
  4. Connect any hangers.
  5. Remove the exhaust system support.
  6. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  7. Install the right exhaust manifold pipe stud nuts to the exhaust manifold pipe studs.
  8. Tighten
    Tighten the right exhaust manifold pipe stud nuts to 35 N·m (26 lb ft)

  9. Inspect the exhaust system for leaks and underbody contact.
  10. Lower the vehicle.

Exhaust Seal Replacement 3.8L

Removal Procedure

  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Notice: Refer to Catalytic Converter Movement Notice in the Preface section.

  3. In order to remove the exhaust manifold pipe gasket disconnect any hangers necessary to reposition the exhaust system.
  4. Suitably support the exhaust system where hangers are removed.

  5. Object Number: 372626  Size: SH
  6. Remove the right exhaust manifold pipe stud nuts from the exhaust manifold pipe studs.
  7. Important: Use caution handling the pipe that contains an oxygen sensor. Do not cut the wire. For removal or repositioning disconnect the connector.

  8. Reposition the exhaust system.
  9. Remove the exhaust manifold pipe gasket.
  10. Inspect all of the components for damage. Refer to Exhaust System Inspection .

Installation Procedure


    Object Number: 372626  Size: SH
  1. Install the exhaust manifold pipe gasket.
  2. Install the exhaust system.
  3. Connect any hangers.
  4. Remove the exhaust system support.
  5. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  6. Install the right exhaust manifold pipe stud nuts to the exhaust manifold pipe studs.
  7. Tighten
    Tighten the right exhaust manifold pipe nuts to 35 N·m (26 lb ft)

  8. Inspect the exhaust system for leaks and underbody contact.
  9. Lower the vehicle.