Subaru Impreza 2002 Service Manual page 73

Clutch
B: OPERATION
The No. 1 spring is made of a shape memory alloy that contracts and loses the tension when the
temperature is low.
When the temperature is high, the orifice valve is kept in a raised position by the No. 1 spring, so
the fluid passage is narrow. When the temperature drops, the No. 1 spring contracts, allowing the
orifice valve to be pushed down by the No. 2 spring. Now, the fluid passage in the orifice unit opens
wide.
[A] In high temperatures
[B] In low temperatures
(1) To master cylinder
(2) Flow of fluid with clutch pedal released
(3) No. 2 spring
FLUID CONTROL SYSTEM (STi MODEL)
(4) Orifice valve
(5) Orifice retainer
(6) From operating cylinder
(7) No. 1 spring
(8) Orifice gap
(9) Body
CL-4
NF0623