33 53 000 Removing And Installing / Replacing Rear Left Or Right Coil Spring
Special tools required:
- 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 free of grease.
- Impact screwdrivers may not be used!
- Do not compress coil spring to full extent.
- Observe manufacturer's instructions.
Observe the following instructions to avoid any risk of injury by the coil springs.
Except M5, M6 and E67: Both coil springs on the relevant axle must be replaced only in the event of corrosion breakage!
M5, M6 and E67: For safety reasons, both coil springs on the relevant axle must always be replaced on motorsport and safety vehicles!
The coil spring is assigned after the vehicle identification number has been entered and the optional extras of the relevant vehicle selected.
Necessary preliminary tasks:
Removing:
Clamp special tool 31 3 341 in vice.
Fit special tools 31 3 357 from above on special tool 31 3 341 until locking pins (1) can be felt and heard to snap into place.
Check seating of special tools 31 3 357 , correct if necessary.
Coils of coil spring must be located completely in recesses of special tools 31 3 357 when tensioned!
Compress coil spring until stress on piston rod is relieved.
Clean coil spring to remove all coarse dirt and mount on special tools 31 3 357 .
Mark installation position of support bearing to spring strut shock absorber using a stud (arrow).
Compress coil spring until stress on piston rod is relieved.
Release nut (gripping piston rod in the process).
Remove plate and support bearing with upper spring pad.
Remove spring strut shock absorber with support pot, rear auxiliary damper, protective tube and lower spring pad sideways from tensioned coil spring.
Relieve tension on coil spring.
Remove coil spring from special tools 31 3 357 .
Assembly:
Coils of coil spring must be located completely in recesses of special tools 31 3 357 when tensioned!
Do not compress coil spring to full extent.
Accommodate coil spring with special tools 31 3 357 .
M5: Make sure when tensioning that the upper section of the coil spring is covered by a protective tube.
Position the coil spring so that both ends of the spring lie outside special tools 31 3 357 by approx. one turn (W).
Tension coil spring.
Check rear auxiliary damper (1), protective tube and lower spring pad (2) for damage, replace if necessary.
Insert spring strut shock absorber in tensioned coil spring and align to end of coil spring using lower spring pad.
Make sure end of coil spring is correctly seated in lower spring pad.
Check support bearing for damage, replace if necessary.
Attach support bearing to piston rod. Use lower spring pad to align support bearing to end of coil spring.
Attach plate to piston rod.
Replace self-locking nut and screw on as far as possible to avoid damaging the piston rod when relieving tension on the coil spring.
Align support bearing by way of a stud (arrow) to marking on spring strut shock absorber.
Relieve tension on coil spring slightly.
Make sure that lower and upper coils of coil spring rest completely in recess of spring plate or support bearing.
Tighten down nut (gripping piston rod in the process).
Tightening torque: 33 52 2AZ . See SHOCK ABSORBERS for specs.
Fully relieve tension on coil spring.
After installation:
- Check HEADLIGHT ADJUSTMENT , correct if necessary