Installing Upper Trailing Arm

→ Wear personal protective gear.

→ Do not raise the wheel suspension higher than the normal vehicle position (vehicle resting on wheels).

Information 

• All screws and threaded joints on the axle must be tightened in vehicle position. Vehicle position means: vehicle standing on its wheels, or the wheel suspension is raised with a universal vehicle lift. Dimension -1-  , from lower edge of wing to center of axle corresponds to vehicle position. The current height can be found in →  4495TW ADJUSTMENT VALUES FOR SUSPENSION ALIGNMENT  . Always observe the following points! 
  Fig 1: Identifying Dimension 1 - Centre Of Wheel To Lower Edge Of Wing (Front Axle)

  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
• On vehicles with air springs, the respective air spring must be bled using the Porsche System Tester. → 4301IN BLEEDING AND FILLING THE LEVELLING SYSTEM
• Vehicle position can be set by carefully raising the relevant wheel bearing housing. 
• Use an intermediate layer (hard rubber)! Do not damage the brake cover plate. 
  Fig 2: Lifting Wheel Carrier (Example Without Wheel And Brake Disc)

  Courtesy of PORSCHE CARS NORTH AMERICA, INC.
• Screws and nuts are Geomet-coated and must not be greased. 
• Grease the splines of the drive shaft slightly with aluminum paste Optimoly TA. 
• Drive shafts must not be left hanging from the joint stop! Tie them up. 

1. Installation is performed in reverse order. Fit according to the previously applied markings -arrows-  .

   Trailing arm to body: Tightening torque 50 Nm (37 ftlb.) +120° 

   Trailing arm to wheel bearing housing: Tightening torque 85 Nm (63 ftlb.) 

   Fig 3: Locating Marking On Upper Trailing Arm

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.