Installing Primary Catalytic Converter On Left Side

Information 

• The primary catalytic converters are installed in reverse order to removal. 
• The primary catalytic converters must be installed upwards on the manifold flange with the least possible tolerance (check the distance from the rear exhaust pipe to the tunnel bridge). 
• The fastening nuts on the studs for the manifold must be tightened in diagonally opposite sequence. 
  1. Primary catalytic converter on left side
  2. Bottom holder on transmission housing (PDK)
  3. Bottom holder on transmission housing (manual transmission)
  4. Seal on flange to turbocharger
  5. Top holder on transmission bell housing
  Fig 1: Overview Of Catalytic Converter Components

  Courtesy of PORSCHE CARS NORTH AMERICA, INC.

1. Replace seals and nuts.
2. Use new clamping sleeves and slide them onto the exhaust pipes.
3. Before finally screwing the primary catalytic converter to the exhaust manifold, adjust the primary catalytic converter so that there is sufficient space between the exhaust system and adjacent components. =>
   1. 3.1. When fitting the primary catalytic converter onto the studs on the exhaust manifold, press the primary catalytic converter up fully and tighten the lower nut first (this prevents it from slipping down). Get a second mechanic to help if necessary.
4. Fit the three remaining fastening nuts between the primary catalytic converter and exhaust manifold and tighten all nuts to the specified tightening torque.
5. Fit the front holder.
6. Move (lift) the exhaust system to the same height as the two exhaust pipes on the primary catalytic converters. Check that the exhaust pipes are parallel.
7. Move the clamping sleeves evenly into installation position and screw them on.
8. Press the exhaust system up slightly and fit the rear holder for the transmission. Get a second mechanic to help if necessary.
9. Tighten all holders, fastening screws and nuts to → Tightening torque: 23 Nm (17 ftlb.)  .
10. Check adjustment and distance from the exhaust system (pipe) to the tunnel bridge =>
    Fig 2: Identifying Exhaust System And Tunnel Bridge

    Courtesy of PORSCHE CARS NORTH AMERICA, INC.
    1. 10.1. Place a steel rule between the upper edge of the tunnel bridge and the exhaust pipe. Minimum distance: 15 mm. The distance must never be less than this value (risk of contact and humming noises). Optimum distance: 17 to 20 mm.
       1. Exhaust pipes
       2. Tunnel bridge
       3. Steel rule is used to measure the distance between the upper edge of the tunnel bridge and the exhaust pipe
       4. Second steel rule as reference for the edge
          Fig 3: Measuring Distance Between Upper Edge Of Tunnel Bridge And Exhaust Pipe

          Courtesy of PORSCHE CARS NORTH AMERICA, INC.