1999 SUBARU LEGACY Service Repair Manual

Part name Description Remedy
1. Front casing(1) Damage on body surfaces
(2) Excessive wear on hole, into which spool
valve is inserted.
(3) Wear and damage on cartridge assembly
mounting surface
(4) Wear and damage on surfaces in contact
with shaft and oil sealReplace with a new one together with spool valve
as selective fit is made.
2. Rear cover(1) Damage on body surfaces
(2) Wear and damage on sliding surfacesReplace with a new one.
3. Shaft(1) Shaft bend
(2) Wear and damage on surfaces in contact
with bushing and oil seal
(3) Wear and damage on rotor mounting sur-
faces
(4) Bearing damageReplace with a new one.
4. Side plate Wear and damage on sliding surfaces Replace with a new one.
5. Cam ring Ridge wear on sliding surfaces
If damage is serious, replace with a new car-
tridge assembly. 6. Vane Excessive wear on nose radius and side surfaces
7. Rotor(1) Wear and damage on sliding surfaces
(2) Ridge wear on vane sliding grooves (If light
leaks with vane in slit against light source)
(3) Damage resulting from snap ring removalCorrect with oil stone. If damage is serious,
replace with a new cartridge assembly.
8. Spool valve Damage or burrs on sliding surface peripheryReplace with a new one together with front cas-
ing as selective fit is made.
9. Connector Damage on threads Replace with a new one.
10. Spring Damage Replace with a new one.
11. Bolts and nuts Damage on threads Replace with a new one.
E: ASSEMBLY
1) Reassembly precautions
(1) Whenever O-rings, oil seals, and snap rings
are removed, they must be replaced with new
ones.
(2) Thoroughly wash parts and allow to dry.
They must be kept free from cleaning oil and
dust.
(3) Reassembly procedure must be performed
in clean place. Ensure that parts are kept away
from waste threads or other dust particles.
(4) Cleaning oil tends to stay inside the front
casing. Remove it completely by blowing com-
pressed air.
(5) Ensure that parts are free from rust. (Use
specified power steering fluid for rust prevention
after cleaning and drying.)
(6) Reverse the sequence of disassembly pro-
cedures.
2) Shaft
(1) Apply grease to oil seal and inner surface of
front casing (at bearing location).
CAUTION:
Make sure that the front body internal surfaces
are free from damage.(2) Using ST, press-fit oil seal into front body.
ST 340099AA000 INSTALLER
CAUTION:
When press-fitting, use care to prevent damage
to surface mating with rear body.
NOTE:
Orient oil seal toward correct direction.
G4M0184
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4-3[W8E0]SERVICE PROCEDURE
8. Oil Pump (Power Steering System)

(3) Using ST, press-fit shaft assembly into front
body and mount snap ring.
ST 340099AA020 INSTALLER
NOTE:
Turn snap ring to ensure that it fits right into the
groove.
G4M0185
3) Cartridge assembly
(1) Apply specified power steering fluid to
O-rings and fit them into front casing.
(2) Install side plate to front casing.
CAUTION:
Use care not to let side plate gall.
G4M0186
(3) Mount rotor onto shaft.
(4) Install 10 vanes into rotor with their nose
radius facing toward cam ring.
(5) Install cam ring to front casing, securing
with knock pins.
CAUTION:
Do not use hammer to fit knock pins in posi-
tion.
G4M0187
4) Rear cover
(1) Mount seal washer on front casing.
(2) With knock pin positions aligned, install rear
cover.
Tightening torque:
16
±2 N´m (1.6±0.2 kg-m, 11.6±1.4 ft-lb)
CAUTION:
Loosely tighten bolts in the sequence (1), (2),
(3), and (4) shown in figure. Then, tighten in the
same sequence.
B4M1139A
5) Spool Valve
CAUTION:
IUse care to prevent damage to O-ring at
installation.
IWhen tightening connector, ensure that
O-ring does not protrude or get caught.
(1) Install spring into front casing. Then, with
spool valve dipped in specified hydraulic oil,
install it into the front casing.
G4M0189
(2) Using a 5-mm dia. round bar, ensure that
valve moves smoothly.
(3) Set O-ring, with grease applied to it, onto
connector and secure connector to front casing.
Tightening torque:
74
±5 N´m (7.5±0.5 kg-m, 54.2±3.6 ft-lb)
6) Check
(1) When reassembly procedures have been
completed, turn shaft by hand to ensure it turns
smoothly. If it binds or other unusual conditions
are evident, disassemble again and check for
foreign matter trapped on sliding surfaces and
65
[W8E0]4-3SERVICE PROCEDURE
8. Oil Pump (Power Steering System)

improper installation. Eliminate the cause of
trouble.
(2) Check followings by referring to ªCHECKº
article.
IExcessive play in pulley shaft
IDitch deflection of pulley
IResistance to rotation of pulley
IMeasurement of generated oil pressure
F: INSTALLATION
1) Install bracket on engine.
Tightening torque:
22
±2 N´m (2.2±0.2 kg-m, 15.9±1.4 ft-lb)
2) Install oil pump on oil tank as follows outside
the vehicle:
NOTE:
Prior to installation, make sure that all oil is
removed from oil pump, oil tank and pipe.
3) Place oil pump in vise.
CAUTION:
Do not place oil pump directly in vise; use soft
pads and hold oil pump lightly to protect it.
4) Install O-ring on oil pump.
CAUTION:
Discard old O-ring and replace with a new one.
5) Install oil tank on oil pump.
Tightening torque:
Bolt C: 15.7
±2.4 N´m (1.60±0.24 kg-m,
11.58
±1.77 ft-lb)
Bolt D: 18.1
±2.5 N´m (1.85±0.25 kg-m,
13.35
±1.84 ft-lb)
CAUTION:
Discard old seal washer and replace with a new
one.
B4M0562A
6) Install stay to oil pump. (2500 cc model only)
Tightening torque:
15.7
±2.5 N´m (1.6±0.25 kg-m, 11.6±1.8
ft-lb)
B4M1163A
7) Install oil pump, previously assembled to oil
tank, on bracket.
Tightening torque:
20.1
±2.5 N´m (2.05±0.25 kg-m, 14.8±1.8
ft-lb)
B4M0560
8) Place oil pump pulley and tighten pulley nut
temporarily.
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4-3[W8F0]SERVICE PROCEDURE
8. Oil Pump (Power Steering System)

9) Interconnect pipes C and D.
Tightening torque:
Joint nut
15
±5 N´m (1.5±0.5 kg-m, 10.8±3.6 ft-lb)
CAUTION:
If a hose is twisted at this step, the hose may
come into contact with some other parts.
B4M1159A
10) Connect pipe D from oil tank.
11) Connect pipe C from oil pump.
CAUTION:
Use a new gasket.
Tightening torque:
34
±5 N´m (3.5±0.5 kg-m, 25.3±3.6 ft-lb)
12) Tighten bolt A.
Tightening torque:
13
±3 N´m (1.3±0.3 kg-m, 9.4±2.2 ft-lb)
13) Install pulley belt to oil pump.
14) Tighten oil pump pulley nut to the specified
torque.
Tightening torque:
61
±7 N´m (6.2±0.7 kg-m, 44.8±5.1 ft-lb)
15) Adjust pulley belt tension. [G2A0].>
16) Tighten bolt belt tension.
Tightening torque:
8
±2 N´m (0.8±0.2 kg-m, 5.8±1.4 ft-lb)
17) Install pulley belt cover bracket.
18) Connect minus terminal of battery.
19) Feed the specified fluid and discharge air.
CAUTION:
Never start the engine before feeding the fluid;
otherwise vane pump might be seized up.
9. Power Steering Fluid
A: RECOMMENDED POWER
STEERING FLUID AND AIR
BLEEDING
Recommended power steering
fluidManufacturer
ATF DEXRON II, ATF DEXRON
IIE or ATF DEXRON IIIB.P.
CALTEX
CASTROL
MOBIL
SHELL
TEXACO
1) Feed the specified fluid with its level being
about 5 cm (2.0 in) lower than the mouth of tank.
2) Continue to turn steering wheel slowly from lock
to lock until bubbles stop appearing in the tank
while keeping the fluid at that level.
3) In case air is absorbed to deliver bubbles into
piping because the fluid level is lower, leave it
about half an hour and then do the former step all
over again.
4) Start, and idle the engine.
5) Continue to turn steering wheel slowly from lock
to lock again until bubbles stop appearing in the
tank while keeping the fluid at that level.
It is normal that bubbles stop appearing after three
times turning of steering wheel.
6) In case bubbles do not stop appearing in the
tank, leave it about half an hour and then do the
former step all over again.
7) Stop the engine, and take out safety stands
after jacking up vehicle again.
Then lower the vehicle, and idle the engine.
8) Continue to turn steering wheel from lock to
lock until bubbles stop appearing and change of
the fluid level is within 3 mm (0.12 in).
9) In case the following happens, leave it about
half an hour and then do former step again.
(1) The fluid level changes over 3 mm (0.12 in).
(2) Bubbles remain on the upper surface of the
fluid.
(3) Grinding noise is generated from oil pump.
10) Check the fluid leakage at flare nuts after turn-
ing steering wheel from lock to lock with engine
running.
CAUTION:
IBefore checking, wipe off any fluid on flare
nuts and piping.
IIn case the fluid leaks from flare nut, it is
caused by dust (or the like) and/or damage
between flare and tapered seat in piping.
ISo remove the flare nut, tighten again it to
the specified torque after cleaning flare and
tapered seat. If flare or tapered seat is
67
[W9A0]4-3SERVICE PROCEDURE
9. Power Steering Fluid

9) Interconnect pipes C and D.
Tightening torque:
Joint nut
15
±5 N´m (1.5±0.5 kg-m, 10.8±3.6 ft-lb)
CAUTION:
If a hose is twisted at this step, the hose may
come into contact with some other parts.
B4M1159A
10) Connect pipe D from oil tank.
11) Connect pipe C from oil pump.
CAUTION:
Use a new gasket.
Tightening torque:
34
±5 N´m (3.5±0.5 kg-m, 25.3±3.6 ft-lb)
12) Tighten bolt A.
Tightening torque:
13
±3 N´m (1.3±0.3 kg-m, 9.4±2.2 ft-lb)
13) Install pulley belt to oil pump.
14) Tighten oil pump pulley nut to the specified
torque.
Tightening torque:
61
±7 N´m (6.2±0.7 kg-m, 44.8±5.1 ft-lb)
15) Adjust pulley belt tension. [G2A0].>
16) Tighten bolt belt tension.
Tightening torque:
8
±2 N´m (0.8±0.2 kg-m, 5.8±1.4 ft-lb)
17) Install pulley belt cover bracket.
18) Connect minus terminal of battery.
19) Feed the specified fluid and discharge air.
CAUTION:
Never start the engine before feeding the fluid;
otherwise vane pump might be seized up.
9. Power Steering Fluid
A: RECOMMENDED POWER
STEERING FLUID AND AIR
BLEEDING
Recommended power steering
fluidManufacturer
ATF DEXRON II, ATF DEXRON
IIE or ATF DEXRON IIIB.P.
CALTEX
CASTROL
MOBIL
SHELL
TEXACO
1) Feed the specified fluid with its level being
about 5 cm (2.0 in) lower than the mouth of tank.
2) Continue to turn steering wheel slowly from lock
to lock until bubbles stop appearing in the tank
while keeping the fluid at that level.
3) In case air is absorbed to deliver bubbles into
piping because the fluid level is lower, leave it
about half an hour and then do the former step all
over again.
4) Start, and idle the engine.
5) Continue to turn steering wheel slowly from lock
to lock again until bubbles stop appearing in the
tank while keeping the fluid at that level.
It is normal that bubbles stop appearing after three
times turning of steering wheel.
6) In case bubbles do not stop appearing in the
tank, leave it about half an hour and then do the
former step all over again.
7) Stop the engine, and take out safety stands
after jacking up vehicle again.
Then lower the vehicle, and idle the engine.
8) Continue to turn steering wheel from lock to
lock until bubbles stop appearing and change of
the fluid level is within 3 mm (0.12 in).
9) In case the following happens, leave it about
half an hour and then do former step again.
(1) The fluid level changes over 3 mm (0.12 in).
(2) Bubbles remain on the upper surface of the
fluid.
(3) Grinding noise is generated from oil pump.
10) Check the fluid leakage at flare nuts after turn-
ing steering wheel from lock to lock with engine
running.
CAUTION:
IBefore checking, wipe off any fluid on flare
nuts and piping.
IIn case the fluid leaks from flare nut, it is
caused by dust (or the like) and/or damage
between flare and tapered seat in piping.
ISo remove the flare nut, tighten again it to
the specified torque after cleaning flare and
tapered seat. If flare or tapered seat is
67
[W9A0]4-3SERVICE PROCEDURE
9. Power Steering Fluid

damaged, replace it with a new one.
11) Inspect fluid level on flat and level surface with
engine ªOFFº by indicator of filler cap.
If the level is at lower point or below, add fluid to
keep the level in the specified range of the indica-
tor. If at upper point or above, drain fluid by using
a syringe or the like.
Fluid capacity:
0.7
(0.7 US qt, 0.6 Imp qt)
(1) Check while fluid temperature is at 21ÉC
(70ÉF) and the level gauge is in the ªCOLDº
position.
(2) Check while fluid temperature is at 60ÉC
(140ÉF) and the level gauge is in the ªHOTº
position.
B4M0563
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4-3[W9A0]SERVICE PROCEDURE
9. Power Steering Fluid

1. Power Steering
A: STEERING CONDITION
Trouble Possible cause Corrective action
IHeavy steering effort in all
ranges
IHeavy steering effort at stand
still
ISteering wheel surges when
turning.1. Pulley belt
IUnequal length of pulley belts
IAdhesion of oil and grease
ILoose or damage of pulley belt
IPoor uniformity of pulley belt cross section
IPulley belt touches to pulley bottom
IPoor revolution of pulleys except oil pump pulley
IPoor revolution of oil pump pulleyAdjust or replace.
2. Tire and rim
IImproper tires out of specification
IImproper rims out of specification
ITires not properly inflated*1Replace or reinflate.
3. Fluid
ILow fluid level
IAeration
IDust mix
IDeterioration of fluid
IPoor warming-up of fluid *2Refill, bleed air, replace
or instruct customer.
4. Idling speed
ILower idling speed
IExcessive drop of idling speed at start or at turning steering
wheel *3Adjust or instruct cus-
tomer.
5. Measure hydraulic pressure. Replace problem parts.
6. Measure steering effort. Adjust or replace.
IVehicle leads to one side or the
other.
IPoor return of steering wheel to
center
ISteering wheel surges when
turning.1. Fluid line
IFolded hose
IFlattened pipeReform or replace.
2. Tire and rim
IFlat tire
IMix use of different tires
IMix use of different rims
IAbnormal wear of tire
IUnbalance of remained grooves
IUnbalance of tire pressureFix or replace.
3. Front alignment
IImproper or unbalance caster
IImproper or unbalance toe-in
ILoose connection of suspensionAdjust or retighten.
4. Others
IDamaged joint assembly
IUnbalanced height
IOne-sided weightReplace, adjust or
instruct customer.
5. Measure steering effort. Adjust or replace.
*1 If tires and/or rims are wider, the load to power steering system is the more. Accordingly, in a condition, for example
before fluid warms-up, relief valve may work before maximum turning angle. In this case, steering effort may be heavy.
When measured hydraulic pressure is normal, there is no abnormal thing.
*2 In cold weather, steering effort may be heavy due to increased flow resistance of cold fluid. After warming up engine,
turn steering wheel from stop to stop several times to warm up fluid. Then if steering effort reduces normally, there is no
abnormal thing.
*3 In cold weather or with insufficient warm-up of engine, steering effort may be heavy due to excessive drop of idling
when turning steering wheel. In this case, it is recommended to start the vehicle with increasing engine speed than usual.
Then if steering effort reduces normally, there is no abnormal thing.
69
[K1A0]4-3DIAGNOSTICS
1. Power Steering

B: MEASUREMENT OF HYDRAULIC
PRESSURE
CAUTION:
IBe sure to complete all items aforemen-
tioned in ªSTEERING CONDITIONº, prior to
measuring hydraulic pressure. Otherwise,
pressure can not be measured correctly. to 4-3 [K1A0].>
IDo not leave the valve of pressure gauge
closed or hold the steering wheel at stop end
for 5 seconds or more in any case, as the oil
pump may be damaged due to long keep of
these conditions.
IPut cotton cloth waste at a place where fluid
drops before pressure gauge is installed. Wipe
off split fluid thoroughly after the measure-
ment.
NOTE:
Keep engine idling during the measurement.
1B1 : MEASURE REGULAR PRESSURE.
1) Install STs to power steering pump.
(1) Drain the power steering fluid about 0.35
(0.4 US qt, 0.3 Imp qt) from oil tank.
(2) Remove two bolts securing power steering
pipes to engine.
(3) Install ST1, 2 and 3 between power steer-
ing pump and pipes using gasket (Part No.
34621AC020) and bolt (Part No. 34620AC010).
ST1 925711000 PRESSURE GAUGE
ST2 34099AC020 ADAPTER HOSE B
ST3 34099AC010 ADAPTER HOSE A
B4M1193A
(4) Replenish power steering fluid up to speci-
fied level.
2) Open valve, and start the engine.
3) Measure regular pressure.
:Is pressure 981 kPa (10 kg/cm2, 142
psi) or less?
: Go to step1B2.
: Trouble may be due to crushed pipe or
hose, leakage from fluid line, foreign
particles in fluid line, etc. Replace faultyparts with new ones.
1B2 : MEASURE RELIEF PRESSURE.
1) Using STs, measure relief pressure.
ST1 925711000 PRESSURE GAUGE
ST2 34099AC020 ADAPTER HOSE B
ST3 34099AC010 ADAPTER HOSE A
B4M1162A
2) Close valve.
:Is pressure 7,159 Ð 7,748 kPa (73 Ð
79 kg/cm2, 1,038 Ð 1,123 psi)?
: Go to step1B3.
: Trouble may be due to malfunctioning
relief valve, fluid leaking into oil pump
interior, abnormal wear of pump vanes,
etc. Replace faulty parts with new ones.
1B3 : MEASURE WORKING PRESSURE.
1) Using STs, measure working pressure.
ST1 925711000 PRESSURE GAUGE
ST2 34099AC020 ADAPTER HOSE B
ST3 34099AC010 ADAPTER HOSE A
B4M1193A
2) Open valve.
3) Measure working pressure of control valve by
turning wheel from stop to stop.
:Is pressure 7,159 Ð 7,748 kPa (73 Ð
79 kg/cm2, 1,038 Ð 1,123 psi)?
: Measure steering force. [K1C0].>
70
4-3[K1B0]DIAGNOSTICS
1. Power Steering