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Home >> Buick >> 2002 >> LeSabre Custom, 4T65E/MN3 >> Repair and Diagnosis >> Engine Mechanical >> Engine Exhaust System >> Repair Instructions >> Exhaust System Replacement >> Installation Procedure
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Installation Procedure

  1. Install the rear exhaust hanger bracket to the rear exhaust hanger.
  2. Install the nut securing the rear exhaust hanger to the rear exhaust hanger bracket. Tighten the rear exhaust hanger nut to 30 N.m (22 ft lbs).
  3. Place a NEW catalytic converter gasket over the catalytic converter studs.
  4. With the aid of an assistant, raise the exhaust system into position, aligning the catalytic converter with the exhaust manifold pipe.
  5. Finger tighten the four nuts to the catalytic converter studs.
  6. Install the bolt securing the rear exhaust hanger bracket to the rear compartment rail. Tighten the rear exhaust hanger bolt to 50 N.m (37 ft lbs).
  7. Install the two bolts securing the center exhaust hangers to the rear suspension support brackets. Tighten the center exhaust hanger bolts to 30 N.m (22 ft lbs).
  8. Tighten the four catalytic converter nuts previously installed in step  5. Tighten the catalytic converter nuts to 25 N.m (18 ft lbs).
  9. Install the heated oxygen sensor.
  10. Install the oxygen sensor wiring harness heat shield.
  11. Lower the vehicle.
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