Assembling Spring Strut

Information 

When replacing the air spring, always replace the boot/bellows.

If the rolling piston slips out of the outer guide during disassembly, it must be correctly positioned again.

• When sliding in the rolling piston, the roller must lie evenly between the outer guide and rolling piston (roll fold). 

  If the shock absorber is not replaced, the sealing ring must be replaced.

• Make sure that everything remains absolutely clean. The smallest impurities can cause leakages. 
• Clean the contact surfaces of the sealing rings with a lint-free cloth. 
• Lightly grease sealing rings with Syntheso Glep 1 (ET No. 000.043.204.68). 

1. Replace sealing ring on shock absorber -Arrow-  .
   Fig 1: Locating Shock Absorber Sealing Ring

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
2. Pull boot/bellows completely over the collar of the shock absorber so that it engages (small diameter downward, 2nd worker required).
3. Fit rubber stop (small diameter downward).
4. Position the air spring on the shock absorber. Grasp the rolling piston and push downward by turning it slightly to the left and right. If the rolling piston has slipped out of the outer guide, it must be pushed back in again while forming a circumferential uniform roll fold on the rolling boot -Arrows-  .
   Fig 2: Locating Roll Fold On Rolling Boot

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
5. Clean the surfaces -2-  on the mounting saddle and on the air spring with a lint-free cloth. Replace sealing ring -1-  on the air spring.
   Fig 3: Identifying Sealing Ring

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
6. Align the air spring so that the residual pressure retaining valve is located close to the imaginary axis of symmetry (approx. 10° off-centre) of the air-spring strut.
   Fig 4: Aligning Air Spring

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
7. Fit bellows (large diameter up).
8. Fit spring-strut mount with socket wrench insert 3353 and arm bracket P9630.
   Fig 5: Removing/Fitting Spring-Strut Mount

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
9. Fit mounting saddle and while doing so align it so that the upper arm of the bearing points to the residual pressure retaining valve.
   Fig 6: Aligning Mounting Saddle

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.
10. Fill the air-spring strut. → WM 4301IN FILLING SPECIFICATION FOR AIR-SPRING STRUT