Subaru 2002 Impreza Service Manual page 352

POWER STEERING SYSTEM
Power Assisted
System
(Power Steering)
2. ROTARY CONTROL VALVE
The rotary control valve consists of a rotor (which rotates together with the steering shaft), a pinion
(which is connected to the rotor and torsion bar), and a sleeve (which rotates together with the
pinion). The rotor and sleeve have grooves C and D, respectively, which form fluid passages
V1
through
V4.
The pinion is in mesh with the rotor with adequate clearance, which enable the rack to be moved
manually by rotating the steering shaft (fail-safe feature).
B
PS-8
NF0286