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Home › Cadillac › 2017 › XTS Base › Repair and Diagnosis › Engine Mechanical › Engine Exhaust System › Repair Instructions › Three-Way Catalytic Converter Replacement (Front LF3) › Installation Procedure

Installation Procedure

    Fig 1: Catalytic Converter Nuts
    GM3284064Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Fastener Caution .

  1. Install NEW exhaust manifold studs (2) and tighten to 25 N.m (18 lb ft).
  2. Install a NEW exhaust gasket to the turbocharger and position the catalytic converter (3) to the engine.
  3. Install NEW catalytic converter nuts (1) and tighten to 50 N.m (37 lb ft).
    4. Fig 2: Catalytic Converter Heat Shield
    GM3284059Courtesy of GENERAL MOTORS COMPANY
  4. Install the catalytic converter heat shield (2) and tighten the fasteners (1) to 10 N.m (89 lb in).
    5. Fig 3: Catalytic Converter Bracket
    GM3284055Courtesy of GENERAL MOTORS COMPANY
  5. Install the transmission fastener (1) and tighten to 58 N.m (43 lb ft).
  6. Install the exhaust front pipe. Exhaust Front Pipe Replacement (LF3) 
  7. Install the heated oxygen sensor. Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (LF3)
  8. Install the turbocharger wastegate actuator vacuum tank. Turbocharger Wastegate Actuator Vacuum Tank Replacement (LF3)
  9. Start the engine and check for exhaust leaks.
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