31 31 031 Replacing Front Left or Right Spring Strut Shock Absorber
31 31 031 Replacing front left or right spring strut shock absorberSpecial tools required:
Important!
- When replacing shock absorber/spring strut, renew auxiliary damper.
Note:
Support bearing flange can only be mounted on spring strut dome in one position.
Version with Vertical Dynamics Management:
Important!
Handle the spring strut with care so as to avoid damaging the control unit (1) and control valve (2).
Warning!
Before using the special tool 31 3 340 take care to read through the Owner's Handbook!
All the safety information 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 work:
^ Remove front spring strut.
Important!
E70 Security only:
Special tool 31 3 341 must be used in conjunction with special tool 31 3 351
Removing:
Clamp special tool 31 3 341 in vice.
Fit special tool 31 3 351 and 31 3 353 from above on special tool 31 3 341 until retaining bolt (1) can be felt and heard to snap into place.
Check seating of special tools 31 3 351 and 31 3 353, correct if necessary.
Clean coil spring to remove all coarse dirt and mount on special tools 31 3 351 and 31 3 353.
Turn spring strut until end of coil spring (1) points upwards.
Warning!
Coils of coil spring must be located completely in recesses of special tools 31 3 351 and 31 3 353!
Compress coil spring until stress on piston rod is relieved.
Slacken nut (1).
Remove joint seat (2), support bearing upper section (3) and support bearing flange (4).
Remove support cup (1) and protective tube (2).
Relieve tension on coil spring.
Remove coil spring with shock absorber from special tools 31 3 351 and 31 3 353.
Remove shock absorber from coil spring.
If necessary, remove auxiliary damper (1) and spring pad (2) from shock absorber.
Installation:
Check auxiliary damper (1) and spring pad (2) for damage, replace if necessary.
Note:
Make sure spring pad (2) is correctly seated in spring cup.
Check spring pad (1), support bearing lower section (2), protective tube (3) and support bearing upper section (4) for damage, replace if necessary.
Note:
Align spring pad (1) by means of coding to support bearing flange (5).
Insert shock absorber into coil spring.
Accommodate coil spring and spring strut with special tools 31 3 351 and 31 3 353.
Note:
End of coil spring (1) must point upwards.
Warning!
Do not compress coil spring to full extent.
Coils of coil spring must be located completely in recesses of special tools 31 3 351 and 31 3 353!
Tension coil spring until support bearing flange can be mounted.
Attach support cup (1) and protective tube (2) to piston rod.
Left spring strut only:
Important!
Stud bolt (1) above recess (2) must point in direction of travel (F)!
Coding (3) of spring pad must be seated in recess (2) opposite stud bolt (1)!
Version with Vertical Dynamics Management:
Stud bolt (4) must be flush with positioning pin (5)!
Right spring strut only:
Important!
Stud bolt (1) above recess (2) must point in direction of travel (F)!
Coding (3) of spring pad must be seated in recess (2) below stud bolt (1)!
Version with Vertical Dynamics Management:
Stud bolt (4) must be flush with positioning pin (5)!
Attach support bearing flange (1) to piston rod.
Align support bearing upper section (3) as illustrated and attach to inner section (2) of support bearing flange (1).
Note:
Pay attention to edge (4) shown in graphic.
Attach flexible disc (1) to piston rod.
Replace nut (2) and tighten down (gripping piston rod in so doing).
Tightening torque 31 31 2AZ.
Important!
Align support bearing flange (1) and shock absorber (3) by means of spring pads to coil spring ends.
Relieve tension on coil spring.
Check installation position of protective tube (2), correct if necessary.
After fitting on version with Vertical Dynamics Management:
^ Code spring strut with DIS Tester and check software version
^ Carry out vertical acceleration sensor adjustment.
