Subaru Impreza 2002 Service Manual page 72

7. Fluid Control System (STi Model)
The clutch operating cylinder incorporates a temperature sensitive orifice unit which controls the
clutch engaging speed depending on the fluid temperature to ensure smooth standing starts irre-
spective of atmospheric temperatures.
A: CONSTRUCTION
The orifice unit consists of an orifice retainer, an orifice valve, and two springs that support the ori-
fice valve.
One of the springs is made of the shape memory alloy that prevents a delay in clutch response
when the weather is cold and the oil viscosity is high.
(1) Body
(2) No. 2 spring
(3) Orifice valve
FLUID CONTROL SYSTEM (STi MODEL)
(4) Orifice retainer
(5) No. 1 spring
(6) To master cylinder
CL-3
Clutch
NF0622