Assembling Spring Strut: Notes

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-  (figure shows rear shock absorber).
   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 it 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: Identifying Roll Fold Rolling Boot

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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

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   Information 

   To align the air spring, carefully turn the rolling piston in order to not damage the roller.

6. Fit and align the air spring. While doing so, the residual pressure retaining valve -1-  must be located exactly at the imaginary axis of symmetry -Arrow-  of the air-spring strut. The residual pressure retaining valve must be facing in the opposite direction to the CDC valve.
   Fig 4: Identifying Residual Pressure Retaining Valve

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7. Fit bellows at the top.
8. Fit spring-strut mount using socket wrench insert 3353 and arm bracket P9630.
   Fig 5: Removing/Fitting Spring-Strut Mount

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9. Fit mounting saddle -Screws A-  and align it so that the upper arm of the bearing -B-  points to the residual pressure retaining valve.
   Fig 6: Fitting Mounting Saddle Screws And Bearing

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10. Align the air spring again so that the residual pressure retaining valve is located exactly at the axis of symmetry -Arrow-  of the air-spring strut.
    Fig 7: Identifying Alignment Position Of Mounting Saddle

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11. Fill the air-spring strut. → WM 4301IN FILLING SPECIFICATION FOR AIR-SPRING STRUT