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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 231 (Engine Exhaust System) >> Repair Instructions >> Catalytic Converter Replacement (Dual Exhaust - Left) >> Installation Procedure

Installation Procedure

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CAUTION: 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.
  1. Remove the oxygen sensors and install into the new exhaust pipe.

    Tighten 

    Tighten the sensors to 42 N.m (31 ft lbs).

  2. Install new gaskets to the muffler flange and the catalytic converter pipe flange.
  3. Install the exhaust pipe.
  4. Install the nuts for the catalytic converter pipe to the exhaust pipe.

    Tighten 

    Tighten the flange nuts to 48 N.m (35 ft lbs).

  5. Install the nuts for the muffler to the exhaust pipe.

    Tighten 

    Tighten the nuts to 48 N.m (35 ft lbs).

    Fig 1: Installing Nuts Retaining Catalytic Converter Pipe To Exhaust Pipe
    G02080472Courtesy of GENERAL MOTORS CORP.
  6. Connect the oxygen sensor connectors.
  7. Install the exhaust hanger and bolts.

    Tighten 

    Tighten the bolts to 17 N.m (13 ft lbs).

    CAUTION: When inspecting or replacing exhaust system components, make sure there is adequate clearance from all points on the underbody to prevent overheating of the floor pan and possible damage to the passenger compartment insulation and trim materials.
  8. Verify the exhaust system for proper clearance and the alignment of all components.
  9. Lower the vehicle.
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