Installing Lower 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: Checking Dimension Between Centre Of Wheel To Lower Edge Of Wing

  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: Example Of Lifting Wheel Carrier 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.

   Lower trailing arm to front of chassis subframe: Tightening torque 90 Nm (67 ftlb.) +120° 

   Lower trailing arm to rear of chassis subframe: Tightening torque 100 Nm (74 ftlb.) 

   Lower trailing arm to wheel carrier: Tightening torque 90 Nm (67 ftlb.) +120° 

   Shock absorber and connecting link to lower trailing arm: Tightening torque 90 Nm (67 ftlb.) +180°