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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1036 (Engine Exhaust System) >> Repair Instructions >> Catalytic Converter Replacement - Left Side (6.0L - Cab/Chassis) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: A special anti-seize compound is used on the HO2S threads. The compound consists of liquid graphite and glass beads. The graphite tends to burn away, but the glass beads remain, making the sensor easier to remove. New, or service replacement sensors already have the compound applied to the threads. If the sensor is removed from an exhaust component and if for any reason the sensor is to be reinstalled, the threads must have the anti-seize compound applied before the reinstallation.
    Fig 1: View Of Catalytic Converter HO2S
    GM1856443Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
  1. If the left catalytic converter was replaced, perform the following steps:
    1. If reinstalling the old sensor, coat the threads with anti-seize compound GM P/N 12377953 or equivalent.
    2. Install the HO2S (1 and 4).

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

    2. Fig 2: View Of Catalytic Converter
    GM1856557Courtesy of GENERAL MOTORS CORP.
  2. Install the left catalytic converter.
    3. Fig 3: View Of Exhaust Manifold, Bolts, Catalytic Converter & Gasket
    GM1856553Courtesy of GENERAL MOTORS CORP.
  3. Using the transmission jack, raise the transmission slightly.
  4. Install the left catalytic converter to exhaust manifold nuts.

    Tighten:  Tighten the nuts to 50 N.m (37 lb ft).

    5. Fig 4: View Of Exhaust Manifold Pipe, Gasket, Bolt & Manifold
    GM1856228Courtesy of GENERAL MOTORS CORP.
  5. Tighten the exhaust manifold pipe to exhaust manifold nuts.

    Tighten:  Tighten the nuts to 50 N.m (37 lb ft).

    6. Fig 5: View Of Rear HO2S, CPA Retainers & Electrical Connectors
    GM1856442Courtesy of GENERAL MOTORS CORP.
  6. Connect the engine wiring harness electrical connector (4) to the left rear HO2S electrical connector (3).
  7. Install the CPA retainer (8) to the left rear HO2S.
    8. Fig 6: View Of Front HO2S, Electrical Connector & CPA Retainer
    GM1856452Courtesy of GENERAL MOTORS CORP.
  8. Connect the engine wiring harness electrical connector (2) to the left front HO2S (1) electrical connector.
  9. Install the CPA retainer (3) to the left front HO2S.
    10. Fig 7: View Of Exhaust Muffler, Exhaust Manifold Pipe, Gasket & Nuts
    GM1856230Courtesy of GENERAL MOTORS CORP.
  10. Tighten the exhaust muffler clamp (3).

    Tighten:  Tighten the clamp to 47 N.m (35 lb ft).

  11. Install any necessary exhaust muffler insulators that were separated from the muffler.
  12. Remove the jack stand from under the muffler.
    13. Fig 8: View Of Transmission Support Crossmember & Bolts
    GM1856226Courtesy of GENERAL MOTORS CORP.
  13. Position the transmission support crossmember.
  14. Install the transmission support crossmember bolts.

    Tighten:  Tighten the bolts to 95 N.m (70 lb ft).

    15. Fig 9: Identifying Transmission Mount Nuts
    GM647997Courtesy of GENERAL MOTORS CORP.
  15. Using the transmission jack, lower the transmission onto the transmission support.
  16. Install the transmission mount to transmission support nuts.

    Tighten:  Tighten the nuts to 95 N.m (70 lb ft).

  17. Remove the support from the transmission.
  18. Lower the vehicle.
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