1998 AUDI S4 clutch

69
Unlike conventional pressure plates, the main
diaphragm spring mounting of the SAC clutch
is non-rigid.
When the clutch plate is renewed, the
adjusting ring must be turned back
(refer to Workshop Manual).
The adjusting ring on new SAC clutch
pressure plates is already reset.
The sensor plate spring and the adjusting ring
locate (mounting) the main diaphragm spring.
SSP 198/73

after wear
after wear
Position as newPosition after
wearPosition as newPosition after
wear
Main plate
spring mounting
Main plate
spring mounting

Conventional clutch
SAC clutch

Adjusting ring

70
Power transmission
Clutch disengagement process
The force of the sensor plate spring
counteracts that of the main diaphragm spring
and is rated such that the main diaphragm
spring is pressed against the adjusting ring
under normal releasing load.
If the force of the main diaphragm spring (also
refer to load diagram) is greater than that of
the sensor plate spring, the main plate spring
will not come into contact with the adjusting
ring.
The compression springs rotate the adjusting
ring along the ramps in the housing cover.
In this way, lining wear is compensated and
the forces are again equalised.

SSP 198/74

Main diaphragm spring
Sensor plate springHousing cover
Adjusting ring with ramps
Compress. spring
Compression spring
Main
diaphragm
spring
mounting
Ramp (wedge)
after wear
as new

71
Gearbox
In the S4, power is transmitted through the
already familiar 6-speed Quattro manual
gearbox of type 01E (C90 gearbox).
As is normal with Audi’s high-performance
models, the gearbox oil is cooled by an oil
pump and an oil cooler.
The
Audi A6
with biturbo engine can be
combined with the following gearbox versions
at the customer’s option:
Front-wheel drive Manual gearbox 01E (without oil cooling)
Quattro drive Manual gearbox 01E (without oil cooling
Front-wheel drive Automatic gearbox 01V
Quattro drive Automatic gearbox 01V
Due to the two mass flywheel in
combination with the SAC clutch, a
new 11 mm-thick spacer ring is used
for the manual gearboxes in
between the engine and gearbox.

SSP 198/76

to oil cooler
Oil pump