BMW 5251 Service Manual page 552

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Clutch
Installing the non-SAC clutch (1 997 5281 model) requires the
use of only a flywheel lock and traditional clutch disc align-
ment tool.
Installing the self-adjusting clutch (SAC) requires several
special tools for aligning and assembling the clutch, as well as
locking the flywheel in place. In addition, the procedure for re-
installing a previously used SAC differs from the procedure
for installing a new SAC. Be sure to read the SAC installation
procedure through before starting the job.
The pressure plate of the SAC uses a spring-loaded wedge
rino to cornoensate for clutch disc wear. The wedge ring ad-
;u$s by means of spr'ng tenson, so specal t o o l s h ~ s t be
used to appy and relieve spring tension as the c utch pres-
sure plate is installed.
Self adjusting clutch (SAC)
and clutch hydraulics