POWER ASSISTED SYSTEM
(POWER STEERING)
PS-2
POWER ASSISTED SYSTEM (POWER STEERING)
General Description
1. General Description
A: SPECIFICATION
Model
NON-TURBO TURBO
RS, RS sport package,
OUTBACK
WRX STi
Whole system
Minimum turning radius m (ft) 5.4 (17.7) 5.7 (18.7)
Steering angle (Inside-Outside) 34.5° — 30.3° 32.9° — 28.5°
Steering wheel diameter mm (in) 385 (15.16) 375 (14.76)
Overall gear ratio (Turns, lock to lock
Gear box)
3.0 2.7 2.6
Gearbox
Type Rack and pinion, Integral
Backlash 0 (Automatically adjustable)
Valve (Power steering system) Rotary valve
Pump
(Power steering
system)
Type Vane pump
Oil tank Installed on body
Output
cm
3
(cu in)/rev.
7.8 (0.476) 7.2 (0.439) 8.5 (0.519)
Relief pres-
sure
kPa (kg/cm
2
, psi)
6,767 — 7,453
(69 — 76, 981 — 1,081)
7,350 — 8,036
(75 — 82,
1,067 — 1,165)
8,100 — 8,800
(83 — 90,
1,175 — 1,276)
Hydraulic fluid control Dropping in response to increased engine revolutions
Hydraulic
fluid
2 (US qt, Imp qt)/min
1,000 rpm: 7 (7.4, 6.2)
3,000 rpm: 5 (5.3, 4.4)
7.5 (7.9, 6.6)
Range of revolution rpm 700 — 9,000
Revolving direction Clockwise
Working fluid
(Power steering
system)
Name ATF DEXRON III
Capacity
2 (US qt, Imp qt)
Oil tank 0.3 (0.3, 0.3)
Total 0.7 (0.7, 0.6)
PS-3
POWER ASSISTED SYSTEM (POWER STEERING)
General Description
Steering wheel Free play mm (in) 17 (0.67)
Turning angle
Inner wheel
WRX, OUTBACK, RS, RS sport package 34.5°±1.5°
STi 32.9°±1.5°
Outer wheel
WRX, OUTBACK, RS, RS sport package 30.3°±1.5°
STi 28.5°±1.5°
Steering shaft
Clearance between steering wheel and
column cover
mm (in) 4.0 (0.16)
Steering gear-
box
(Power steer-
ing system)
Sliding resistance N (kgf, lb) 400 (41, 90) or less
Rack shaft
play in radial
direction
Right-turn steering mm (in) 0.19 (0.0075) or less
Left-turn steering mm (in)
Horizontal movement:
0.15 (0.0059) or less
Vertical movement:
0.3 (0.012) or less
Input shaft
play
In radial direction mm (in) 0.18 (0.0071) or less
In axial direction mm (in) 0.5 (0.020) or less
Turning resistance N (kgf, lb)
Maximum allowable value:
Less than 10.5 (1.1, 2.4)
Difference between right and left
sliding resistance: Less than 20%
Oil pump
(Power steer-
ing system)
Pulley shaft
Radial play mm (in) 0.4 (0.016) or less
Axial play mm (in) 0.9 (0.035) or less
Pulley
Ditch deflection mm (in) 1.0 (0.039) or less
Resistance to rotation N (kgf, lb) 9.22 (0.94, 2.07) or less
Regular pressure (Unloaded)
kPa (kg/cm
2
, psi)
981 (10, 142) or less
Steering wheel
effort
(Power steer-
ing system)
At standstill with engine idling on a con-
crete road
N (kgf, lb) 31.4 (3.2, 7.1) or less
At standstill with engine stalled on a
concrete road
N (kgf, lb) 294.2 (30, 66.2) or less
Recommended power steering fluid Manufacturer
ATF DEXRON III
B.P.
CALTEX
CASTROL
MOBIL
SHELL
TEXACO
PS-4
POWER ASSISTED SYSTEM (POWER STEERING)
General Description
CAUTION:
This table lists various clearances that must be correctly adjusted to ensure the normal vehicle driv-
ing without interfering noise, or any other faults.
Location Minimum allowance
(1) Crossmember — Pipe 5 mm (0.20 in)
(2) DOJ — Shaft or joint 14 mm (0.55 in)
(3) DOJ — Valve housing 11 mm (0.43 in)
(4) Pipe — Pipe 2 mm (0.08 in)
(5) Stabilizer — Pipe 5 mm (0.20 in)
(6) Exhaust pipe — Pipe 11 mm (0.43 in)
(7) Exhaust pipe — Gearbox bolt 15 mm (0.59 in)
(8) Side frame — Hose A and B 10 mm (0.39 in)
(9) Cruise control pump — Hose A and B 15 mm (0.59 in)
(10) Pipe portion of hose A — Pipe portion of hose B 1.5 mm (0.059 in)
(11) AT cooling hose — Joint 20 mm (0.79 in)
PS-00355
(10)
(5)
(9)
(8)
(1)
(6)
(4)
(3)
(2)
(7)
(11)
PS-5
POWER ASSISTED SYSTEM (POWER STEERING)
General Description
B: COMPONENT
1. STEERING WHEEL AND COLUMN
(1) Bushing (5) Steering wheel Tightening torque: Nâ‹…m (kgf-m, ft-lb)
(2) Steering shaft (6) Airbag module T1: 1.2 (0.12, 0.9)
(3) Steering roll connector (7) Steering wheel lower cover T2: 25 (2.5, 18.1)
(4) Column cover T3: 45 (4.6, 33.2)
PS-00618
(2)
(4)
T2
T1
(3)
(1)
T3
(6)
(5)
(7)
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Subaru Impreza WRX STI 2005 Factory Service Repair Manual
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Description
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- Subaru Impreza WRX STI 2005
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