Installing Air-Spring Strut

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WARNING: Wheel bearing housing raised incorrectly

Risk of squashing
Risk of damage to components

→ 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.

Installation is performed in reverse order.

Upper air-spring strut to body: Tightening torque 46 Nm (34 ftlb.)

Air line to spring strut: Tightening torque 3 Nm (2 ftlb.)

Lower air-spring strut to trailing arm: Tightening torque 90 Nm (67 ftlb.) +120°

Drive shaft to differential: Tightening torque 22 Nm (16 ftlb.) +90°

Conventional connecting link to air-spring strut: Tightening torque 40 Nm (30 ftlb.) +90°

PDCC connecting link to air-spring strut: Tightening torque 50 Nm (37 ftlb.) +30°

Tie-rod ball to wheel bearing housing: Tightening torque 85 Nm (63 ftlb.)

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

Air guide to lower trailing arm: Tightening torque 10 Nm (7.5 ftlb.)

Brake calliper to wheel bearing housing: Tightening torque 140 Nm (104 ftlb.)