37 12 092 Replacing rear left or right spring strut

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Special tools required

31 3 340
31 3 341
31 3 351
33 0 040

WARNING: Prior to each use of special tool 31 3 340 , 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:

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

Necessary preliminary tasks

Remove REAR SPRING STRUT SHOCK ABSORBER

Removing

Clamp special tool 31 3 341 in vice.

Fit special tools 31 3 351 from above on special tool 31 3 341 until retaining bolt (1) can be felt and heard to snap into place.

Fig 1: Identifying Spring Compressor Tool (31 3 351)

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Clean coil spring to remove all coarse dirt and mount on special tools 31 3 351 .

WARNING: Coils of coil spring must be located completely in recesses of special tools 31 3 351 !

Fig 2: Identifying Spring Compressor Tool (31 3 351)

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Compress coil spring until stress on piston rod is relieved.

Release nut with special tool 33 0 040.

Remove plate and support bearing with spring pad.

Remove shock absorber with support cup, auxiliary damper, protective tube and spring pad sideways from tensioned coil spring.

Fig 3: Identifying Special Tool (33 0 040)

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Impact screwdrivers are prohibited!

Risk of damage inside the shock absorber

If necessary, remove support cup, auxiliary spring (1) with protective tube and spring pad (2) from shock absorber.

Fig 4: Identifying Auxiliary Spring And Spring Pad

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Relieve tension on coil spring and remove from special tools 31 3 351 .

Fig 5: Identifying Spring Compressor Tool (31 3 351)

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Assembly

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 !

Tension coil spring.

Check auxiliary spring (1) with protective tube and spring pad (2) for damage, and replace if necessary.

Fig 6: Identifying Spring Compressor Tool (31 3 351)

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IMPORTANT: Coat contact surface of spring pad (2) to shock absorber with Circo Light.

Fig 7: Identifying Auxiliary Spring And Spring Pad

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Attach support cup to piston rod.

Insert shock absorber in tensioned coil spring.

Fig 8: Inserting Shock Absorber In Tensioned Coil Spring

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Check support bearing for damage, replace if necessary.

Attach support bearing and plate to piston rod.

IMPORTANT: Align support bearing with the shock absorber!

Fig 9: Identifying Support Bearing

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Arrow (1) on the support bearing must point to the control unit (2).

Replace nut and tighten down with special tool 33 0 040.

Tightening torque 33 52 2AZ .

Impact screwdrivers are prohibited!

Risk of damage inside the shock absorber

IMPORTANT: Align support bearing by way of spring pad to end of coil spring.

Fig 10: Identifying Special Tool (33 0 040)

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IMPORTANT: Lower end of coil spring must rest on stop of spring pad!

Fig 11: Identifying Coil Spring End

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Relieve tension on coil spring.

Fig 12: Identifying Coil Spring Mark

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Installation note:

Secure upper spring strut in body.
Align shock absorber eye to swivel bearing by turning shock absorber.
Code spring strut with ISID tester and check software version