Replacing Front Left or Right Spring Strut Shock Absorber

31 31 031 - Replacing front left or right spring strut shock absorber





Special tools required:
- 31 2 210 31 2 210 Socket Wrench Socket WAF 21
- 31 3 340 31 3 340 Spring Tensioner
- 31 3 341 31 3 340 Spring Tensioner
- 31 3 354 31 3 350 Spring Holder
- 31 3 355 31 3 350 Spring Holder





Warning!
Prior to each use of the special tool 31 3 340 31 3 340 Spring Tensioner, it is essential to read the associated Owner's Handbook fully!

All the safety precautions and instructions contained in the Owner's Handbook must be strictly observed!

Failure to observe these safety precautions and instructions increases the risk of serious physical injury, damage to your health and damage to property and equipment!





Important!
1. Prior to each use, check the special tools for defects, modifications and operational reliability.
2. Damaged/modified special tools must not be used!
3. No changes or modifications may be made to the special tools!
4. These special tools are intended solely for the purpose of tightening and relieving cylindrical and tapered suspension springs.
5. Keep special tools dry, clean and (down to the spindle) free from grease.
6. Impact screwdrivers are prohibited!
7. Do not compress coil spring to full extent.





Necessary preliminary tasks:
- Remove front spring strut Removing and Installing Complete Left or Right Spring Strut Shock Absorber





Removing:

Clamp special tool 31 3 341 31 3 340 Spring Tensioner in vice.

Fit special tools 31 3 354 31 3 350 Spring Holder and 31 3 355 31 3 350 Spring Holder from above on special tool 31 3 341 31 3 340 Spring Tensioner until locking pins (1) can be felt and heard to snap into place.

Check seating of special tools 31 3 354 31 3 350 Spring Holder and 31 3 355 31 3 350 Spring Holder, correct if necessary.





Clean coil spring to remove coarse contamination and take up with special tools 31 3 354 31 3 350 Spring Holder and 31 3 355 31 3 350 Spring Holder.

Twist spring strut until end of coil spring (1) is flush with end of special tool 31 3 355 31 3 350 Spring Holder.

Warning!
Special tool 31 3 354 31 3 350 Spring Holder must rest correctly on upper spring plate!

Lower coil of coil spring must rest completely in recess of special tool 31 3 355 31 3 350 Spring Holder!

Compress coil spring until stress on piston rod is relieved.





Take off cap.

Release nut with special tool 31 2 210 31 2 210 Socket Wrench Socket WAF 21 (grip piston rod in the process).

Remove support bearing, dust sleeve and shim.

Remove shock absorber with auxiliary damper, gaiter and lower spring pad sideways from tensioned coil spring.





If necessary, remove auxiliary damper (1) with gaiter (2) and spring pad (3) from shock absorber.





Relieve tension on coil spring.

Remove coil spring with spring plate from special tools 31 3 354 31 3 350 Spring Holder and 31 3 355 31 3 350 Spring Holder.





Assembly:

Check spring pad (1) for damage, replace if necessary.

Attach spring plate (2) with spring pad (1) to coil spring.

Note:
End of coil spring must be positively aligned to spring pad (1).





Accommodate coil spring and spring plate with special tools 31 3 355 31 3 350 Spring Holder and 31 3 354 31 3 350 Spring Holder.

Twist coil spring until lower end of coil spring (1) is flush with end (2) of special tool 31 3 355 31 3 350 Spring Holder.





Warning!
Do not compress coil spring to full extent.

Special tool 31 3 354 31 3 350 Spring Holder must rest correctly on upper spring plate!

Lower coil of coil spring must rest completely in recess of special tool 31 3 355 31 3 350 Spring Holder!

Tension coil spring.





Check auxiliary damper (1), gaiter (2) and spring pad (3) for damage, replace if necessary.





Insert shock absorber in tensioned coil spring.

Attach shim and dust protection sleeve to piston rod.

Check support bearing for damage, replace if necessary.

Attach support bearing to piston rod.

Replace nut and tighten down with special tool 31 2 210 31 2 210 Socket Wrench Socket WAF 21 (grip piston rod in the process).

Tightening torque 31 31 2AZ Spring Struts (Front).

Fit cover cap.





Important!
Spring pad (1) must rest positively on spring plate (2)!

Upper end of coil spring must rest on stop of spring pad (1)!





Important!
Align lower end of coil spring (1) as pictured to spring pad.

Relieve tension on coil spring.

Check installation position of gaiter, correct fold if necessary.

Note:
End of coil spring (1) must not touch against shoulder of spring pad.

The recess (2) only serves to reinforce and correctly seat the lower spring pad and does not serve as a stop for the spring end.





After installation:

- Carry out wheel alignment check if a spring strut with support bearing was or has been installed without centering pin.