GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 HUMMER 🢒 2008 🢒 H2 🢒 Engine 🢒 Engine Exhaust 🢒 Exhaust Seal Replacement

Removal Procedure
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Remove the engine protection shield. Refer to Engine Protection Shield Replacement .

    3. Object Number: 665040 Size: SH
  3. Disconnect the CPA retainer.
  4. Disconnect the oxygen sensor electrical connector (1).
  5. Support the catalytic converter or exhaust manifold pipe with adjustable jackstands.

    6. Object Number: 664826 Size: SH
  6. Remove the right exhaust manifold pipe nuts.

    7. Object Number: 309165 Size: SH
  7. Remove the left exhaust manifold pipe nuts.
  8. Remove the exhaust hanger mounting bracket bolts.
  9. Lower the catalytic converter or exhaust manifold pipe using the adjustable jackstands.
  10. Remove the exhaust manifold pipe seal(s).

Installation Procedure

    Object Number: 309165 Size: SH
  1. Install the exhaust manifold pipe seal(s).
  2. Raise the catalytic converter or exhaust manifold pipe using the adjustable jackstands.

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

  3. Install the exhaust hanger mounting bracket bolts.
  4. Install the left exhaust manifold pipe nuts.

    5. Tighten

        • Tighten the transmission bolts to 100 N·m (74 lb ft).
        • Tighten the exhaust pipe hanger bracket bolts to 12 N·m (106 lb in).
        • Tighten the exhaust manifold pipe nuts to 50 N·m (39 lb ft).

    Object Number: 664826 Size: SH
  5. Install the right exhaust manifold pipe nuts.

    6. Tighten
    Tighten the nuts to 50 N·m (39 lb ft).


    Object Number: 665040 Size: SH
  6. Connect the oxygen sensor electrical connector (1).
  7. Connect the CPA retainer.
  8. Remove the adjustable jackstands from catalytic converter or exhaust manifold pipe.
  9. Install the engine protection shields. Refer to Engine Protection Shield Replacement .

    10. Tighten
    Tighten the bolts to 20 N·m (15 lb ft).

  10. Lower the vehicle.