Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 581
PS-45
Oil Pump
POWER ASSISTED SYSTEM (POWER STEERING)
7. Oil Pump
A: REMOVAL
1) Disconnect the ground cable from battery.
2) Remove the V-belts (front side belt).
• Except for STI model: <Ref. to ME(w/o STI)-38,
• STI model: <Ref. to ME(STI)-40, REMOVAL, V-
3) Disconnect the connector from power steering
pump switch.
4) Disconnect the pressure hose and suction hose
from the oil pump.
CAUTION:
• Do not allow fluid to come into contact with
the pulley belt.
• To prevent foreign matter from entering the
hose and pipe, cover the open ends with clean
cloth.
5) Remove the installation bolt of the power steer-
ing pump bracket.
6) Place the oil pump bracket in a vise, and remove
the two bolts from the front side of the oil pump.
CAUTION:
When securing the oil pump bracket in a vice,
hold the oil pump bracket with the least possi-
ble force between two pieces of wood.
7) Remove the bolt from the rear side of oil pump.
8) Disassemble the oil pump and bracket by insert-
ing a flat tip screwdriver as shown in the figure.
(1) Suction hose
(2) Pressure hose
PS-00459
(2)
(1)
PS-00188
PS-00128
PS-00129
PS-46
Oil Pump
POWER ASSISTED SYSTEM (POWER STEERING)
B: INSTALLATION
1) Install the oil pump to bracket.
2) Tighten the bolts which hold the oil pump to the
bracket.
Tightening torque:
16 N·m (1.6 kgf-m, 11.8 ft-lb)
Tightening torque:
48 N·m (4.9 kgf-m, 35.4 ft-lb)
3) Attach the installation bolts of the power steering
pump bracket.
Tightening torque:
Refer to “COMPONENT” of “General Descrip-
tion”. <Ref. to PS-7, OIL PUMP, COMPO-
4) Connect the pressure hose and suction hose.
CAUTION:
Be careful when installing; If the hose is twisted
it may come into contact with other parts.
Tightening torque:
Eye bolt
40 N·m (4.1 kgf-m, 29.5 ft-lb)
5) Connect the power steering pump switch to the
connector.
6) After installing the oil pump, fill the oil pump with
fluid while rotating the pulley by hand and bleed the
air from the oil pump.
CAUTION:
Always fill the oil pump with the fluid to prevent
abnormal noise and seizure of the oil pump.
7) Install the V-belts (front side belt).
• Except for STI model: <Ref. to ME(w/o STI)-38,
• STI model: <Ref. to ME(STI)-40, INSTALLA-
8) Connect the battery ground terminal.
9) Fill with the specified power steering fluid. <Ref.
to PS-51, Power Steering Fluid.>
CAUTION:
Never start the engine before filling with fluid;
otherwise the vane pump may become seized.
PS-00128
PS-00137
PS-00188
(1) Suction hose
(2) Pressure hose
PS-00459
(2)
(1)
PS-47
Oil Pump
POWER ASSISTED SYSTEM (POWER STEERING)
C: INSPECTION
1. BASIC INSPECTION
Perform the following inspection procedures and replace faulty parts.
2. SERVICE LIMIT
Make a measurements as follows. If it exceeds the service limit, replace with a new part.
CAUTION:
• When securing the oil pump in a vice, hold the oil pump with the least possible force between two
pieces of wood.
• Do not set the outside of flow control valve or pulley on a vise; otherwise outside or pulley might
be deformed. Select properly sized wood pieces.
1) Play of the pulley shaft
Condition:
P: When applying a force of 9.8 N (1.0 kgf, 2.2 lbf)
Service limit:
Play in the radial direction (Direction )
0.2 mm (0.008 in) or less
Axial play (Direction )
0.9 mm (0.035 in) or less
No.
Parts
Inspection
Corrective action
1
Oil pump (exterior)
(1) Crack, damage or oil leakage
Replace the oil pump with a new part.
(2) Play of pulley shaft
Measure the radial play and axial play.
If any of these exceeds the service limit, replace the
oil pump with a new part.
2
Pulley
(1) Damage
Replace the oil pump with a new part.
(2) Bend
Measure the V groove deflection.
If it exceeds the service limit, replace the oil pump
with a new part.
3
Oil pump (interior)
(1) Faulty or seized of vane pump
Check the rotating resistance of pulley.
If it exceeds the service limit, replace the oil pump
with a new part.
(2) Bend in the shaft or damage to
bearing
If the a string is wrapped on the pulley and rotated,
and the oil pump emits a noise that is markedly differ-
ent in tone and loudness from a sound of a new oil
pump, replace the oil pump with a new part.
4
O-ring
Cracking or deterioration
Replace with a new part.
5
Bracket
Cracks
Replace with a new part.
(1) Dial gauge
P
(1)
PS-00145
(1) Dial gauge
P
(1)
PS-00146
PS-48
Oil Pump
POWER ASSISTED SYSTEM (POWER STEERING)
2) Deflection of the pulley groove
Service limit:
1.0 mm (0.039 in) or less
NOTE:
Read the value on one surface of V groove, set the
dial gauge on the other surface, and read the value
of the dial gauge.
3) Rotating resistance of pulley
Service limit:
Maximum load: 9.22 N (0.94 kgf, 2.07 lbf) or
less
NOTE:
• A rather higher value may be indicated when pul-
ley starts turning.
• Measure the load during rotation to make a judg-
ment.
3. HYDRAULIC PRESSURE
NOTE:
• To measure hydraulic pressure correctly, be
sure to complete all the items in “INSPECTION”,
prior to performing the measurement. <Ref. to PS-
52, INSPECTION, General Diagnostic Table.>
• Do not leave the valve of pressure gauge closed
or hold the steering wheel at lock for 5 seconds or
more in any case, this can damage the oil pump.
• Before attaching a pressure gauge, place cloth
at locations where fluid is expected to spill. Wipe off
any spilt fluid completely after the measurement.
1) Regular pressure measurement
(1) Connect the ST1, ST2 and ST3.
ST1 925711000
PRESSURE GAUGE
ST2 34099AC020 ADAPTER HOSE B
ST3 34099AC010 ADAPTER HOSE A
(2) Remove the air intake duct.
• Except for STI model: <Ref. to IN(w/o STI)-
10, REMOVAL, Air Intake Duct.>
• STI model: <Ref. to IN(STI)-10, REMOVAL,
(3) Disconnect the pressure hose from the
pump.
(4) Using the gasket (Part No. 34621AC021)
and bolt (Part No. 34620AC010), install the ST2
to pump instead of pressure hose.
(5) Attach the ST3 to the end of pressure hose
which is removed from pump.
(6) Replenish power steering fluid up to the
specified level.
(7) Open the valve, and start the engine.
(1) Dial gauge
(1) Spring scale
PS-00147
PS-00148
(1) Suction hose
(2) Pressure hose
PS-00459
(2)
(1)
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