power steering HONDA INTEGRA 1998 4.G User Guide

System Description
Fluid Flow Diagram
The system is a compact rotary-valve-type power steering, connected to the steering gearbox. The fluid pressure is pro-
vided by a vane-type pump which is driven by the engine crank pulley. The amount of fluid and pressure is regulated by
the flow control valve built into the pump. The fluid pressure from the pump is delivered to the valve body unit around the
pinion of the steering gearbox. The valve inside the valve body unit controls the hydraulic pressure and changes the direc-
tion of the tlow. The fluid then flows to the power cylinder, where rack thrust is generated. Fluid returning from the power
cylinder flows back to the reservoir, where the fluid is "filtered" and supplied to the pump again
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VALVE BODY UNIT
GEARBOXFLOW CONTROL VALVEPOWER CYLINDER
17-4

System DescriPtion
Steering Gearbox
it
The rack,and-pinion type steering gearbox has a Valve body unit incorporated with the pinion to control the steering fluid
pressure. steering fluid from the pump is regulated by a rotary valve in the valve body unit and is sent through the cylin-
derpipetothepowercy|inder,wherehydrauIicpressureisapp|ied.Thesteeringf|Uidintheothersideofthepowercy|in-
der returns through the cylinder pipe and valve body unit to the reservoir'
Valve Body Unit
Inside the valve body unit is the valve, which is coaxial with the pinion shaft, and controls the steering fluid pressure The
valve housing ls connected wirh the fluid pipe from the pump. return pipe to the reservoir, and the two cylinder pipes
from the respective power cylinder.
The pinion shaft is double - structured with the input shaft connected to the pinion gear, both of which are interconnected
with the torsion bar.
The pin inserted in the valve and the pinion shaft groove engage; this allows the pinion shaft to rotate together with the
Because of this construction. the difference in angle in the circumferential direction between the input shaft and the valve
becomes larger according ro the torsional strength ol the pinion or steering resistance. However. maximum torsion
between the shafts is regulated by the engaged splines of the shafts at the pin engagement section to hold the torsion bar
within the set value.
This allows the steering system to function as an ordinary rack-and-pinion type steering if the steering iluid is not pressur-
ized because of a faulty PumP.
VALVE
INPUT SHAFT
INPUT SHAFT
VALVE XOUSING
of
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lEng.ge with th€ Pinionshaft groove)
TORSION BARDift6rance in angle b6twe€n theinput ih.ft.nd pinion shalt
la-l
B
VALVE BODY UN]T
SECNON B.B
17-8

INPUT SHAFT
High assist at lower speedsl
When steering resistance is high, such as when driving at low speed, or when turning the wheel with the car stopped, the
diiference in angle created between the input shaft and the valve opens the tluid passage on one side, and closes the fluidpassage on the other side, at each pair of orifices. The fluid pressure lncreases in the side of the power cylinder fed by thelarger fluid passage. This increased pressure pushes on the rack piston, allowing the steering wheel to be turned with light
effon. On the other side of the power cylinder, the return passage opens allowing the steering fluid to return through theinput shaft to the reservoir. The fluid passages to the power cylinder automatically change in size, increasing as the steer-ing resistance increases. In other words, the passages become larger and power assist increases when the steering effort
would normally be high, (for example, when parking or making low speed turns), and the passages become smaller andpower assist decreases when the steering effort would normally be low, (for example, when driving at high speeds or
straight ahead).
FLUIO PASSAGE TOPOWER CYLINDER
Ce) r.r;
VK
Pressure Control
Low assist at higher speedsl
When steering resistance is low, such as when driving at high speeds, or when driving straight ahead. the lnput shaft is
near or in the neutral position, so there is liftle or no flow to any of the power cylinder orifices. Most of the feed pressure
from the pump is bypassed to the reservoir. Because of this, the pressure stays the same in both sides of the power cvlin-
der, resulting in low or no assist.
RETURN PASSAGE{To RESERVOIR)
POWER CYLINDERlHigh fluid pressurelI
ALVE FTom PUMP
RESERVOIR
SECTION A-A
17-9

Troubleshooting
General Troubleshooting
Check the following before you begin:
o Has the suspension been modified in a way that would affect steering?
. Are tire sizes and air pressure correct?
. lsthe steering wheel original equipment or equivalent?
. ls the power steering pump belt properly adiusted?
. ls steering fluid reservoirtilled to proper level?
. ls the engine idle speed correct and steadyT
Hard steering (check the power assist, see page 17-18. It the torce is over 34 N (3.5 kgf, 7 7 lbf), proceed with this troubl*hooting l
Abnormalfluidpressur€ (lluid
pressure rs roohish)
Too low reliefpress{ire
Normal line and hos6
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iFaulty valve body unit
Normal Abnormal
rlrl
l{
Faulty pump assembly Faulty tlow control valv6
Ch€ck the tegd and return circuit lines and hoso
between the gearbox and pump for clogging and
detormation.
Check pump fluid Pressuro {sespage 17'221.Mgasure stoady-stat€ fluid Pres_sure while idling with the both
valv6Iully opon.It should be 1,500 kPa (15 kgf/
cm,,213 psi) or below.
Normal
Check the flow control valve (seo page 17-37).. Check the valvs Ior smooth movemont in the hous-
Ing.. Check tho reliel valvo for leaks.
Measure pump reliet prgssure
while idling with the both vslveIully closed.It should b€ 6,400 - 7,400 kPa {65- 75 kgt/cm', 924 - 1,067 psi)
Normal reliel pressure
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Go to pags 17-11
17-10

Unev€n or rough steering.Adjust rack guid€ (see page 17-21).
It the problem is not corrocted byadjusting the rack guid€, replacethe g€a.box.
Adjust b6ll tension. Ropl6ce theb6lt, it necossary {s€e p€ge 17-20).
lfth€ engine stalls when the wheelis turned while the vehic16 isstopped or moving at low speed.adjust idl6 sp6od (s€e s€ction 111.
ldle spoed low or €rratic.
Check powsr st6oring fuid lovel. lfthe lovel is exceggively low, ch6cktor leaks in the svstem. Add fluidto the sD6cilied l6v6l,
Air in r€gervoir, or check powsr
steering fluid lovel.
lf fluid level is OK, chock O-ringsand seals on both 6nds ot thepump suction hose. and the P/Spump housing mating surfacesand tho oumo shaft oil seal forsuction lgakr. Roplaco parts asn6c6ssary.
Pump b€lt slipping on pulloy(pump stops momentarily).Adiust b6lt t€nsion {s6e page '17-
20) or r6olac€ b€lt.
Chock if pump pressure is normaland the gauge needle trav€l is 500kPa (5 kgl/cm', 71 psi) or lesB.Ch€ck the flow control valvo if theno€dl€ trav€l oxco€ds 500 kPa {5kg7cml, 71 p6i). lf the flow controlvalve is normal. roplace the pumpas an assemDtv.
Install the power st66ring pr6s-
su16 gaug6. Close th6 prossure
control valve lully and m6asurethe pump prossure (see page'17-22t.
Ste€ring wheol kicks backduring wide turns.
7-13

Inspection and Adjustment
Steering Operation
Place the front wheels in the straight ahead position and
measure the distance the steering wheel can be turned
without moving the front wheels.
ROTATIONAL PLAY: 0 - 10 mm {0 - 0.39 inl
lf the play exceeds the service limit. perform rack guide
adiustment (see page 17-211.
lf the play is still excessive after rack guide adjustment.
inspect the steering linkage and gearbox as described
on the neld page.
Power Assist Check with
Vehicle Parked
Check the power steering fluid level (see page 17-
21) and pump belt tension (see page 17-201.
Start the engine, allow it to idle. and turn the steer
ing wheel from lock-to-lock several times to warm
up the fluid.
Attach a spring scale to the steering wheel. With the
engine idling and the car on a clean. dry floor. pull
the scale as shown and read it as soon as the tires
begin to turn,
4. The scale should read no more than 34 N (3.5 kgf,
7.7 lbf). lf it reads more, check the gearbox and
pump.
ROTATIONAL PLAY

Inspection and Adjustment
Pump Belt
NOTE: When using a new belt, first adjust the deflection
or tension to the values for the new belt, then readjust
the deflection or tension to the values for the used belt
after running engine for five minutes,
Inspection
Attach the soecial tool to the belt and measure the ten-
sion of the belt.
Tension:
Usad Belt: 390 - 54O N {/10 - 55 kgf. 88 - 120 lbf}
Nsw Belt: 740 - 880 N {75 - 90 kgf. 170-2(X)lbf)
NOTE:
. lf there are cracks or any damage evident on the belt,
replace it with a new one.
. Follow the manufacturer's instructions for the tension
gauge.
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,lt l
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CRANKSHAFT PULEYBELT TENSION GAUGE07JGG - 001010A
Inspect the pump belt for cracks or any damage.
Replace the belt with a new one if necessary.
Mea3urement without Bah Tonsion Gaugo:
Apply a force of 98 N {10 kgt,22 lbll and measure the
deflection between the power steering pump and the
crankshaft pulleys,
Drllection:
Us.d B6h: 11.5 - 13.5 mm (0.45 - 0.53 in)
New Bsh: 8.0 - 10.0 mm 10.31 - 0.39 inl
POWER STEERING PULLEY
17-20
Adiustment
1. Loosen the power steering pump mounting bolts.
2. Turn the adjusting bolt to get the proper belt ten-
sion, then retighten the bolts.
3. Stan the engine and turn the steering wheel from
lock-to-lock several times. then stop the engine and
recheck the deflection of the belt.
24 N.m l2.a kgf.m, 17 lbf.ftl

Rack Guide AdjustmentFluid Replacement
Check the reservoir at regular intervals, and add fluid as
neceSsary.
CAUTION: Use only Genuine Honda Powel Ste€ring
Fluid-V. Using other fluids such as ATF or othor manu-
laclurer's power ste€ring fluid will damag€ the systom.
SYSTEM CAPACIW:
B18Gl ongine:
1.06lit€r (1.12 US. qt,0.93 lmp.qt)
Excopt 8l8Cl ongino:
1.0 lher (r.06 US. qt.0.88 imp.qtl
at disa$ombly
RESERVOIR CAPACITY:
0.,0 liter {0.42 US. qt, 0.35 lmp.qt}
LEVEL LINE
LEVEL LINE
Raise the reservoir and disconnect the return hose
that goes to the oil cooler.
Connect a hose of suitable diameter to the discon-
nected return hose and put the hose end in a suit-
able container.
CAUTION: Take care not to spill thq fluid on lhe
body and parts. Wipe off any spilled fluid al onc€.
Start the engine. let it run at idle, and turn the steer-
ing wheel from lock-to-lock several times. When
fluid stops running out of the hose, shut off the
engine. Discard the fluid.
2.
RETURN HOSE{From the oilcooler)
4. Reinstallthe return hose on the reservoir.
5. Fill the reservoir to the uDDer level line.
6. Start the engine and run it at fast idle, then turn the
steering from lock-to-lock several times to bleed air
from the system,
7. Recheck the fluid level and add some it necessary.
CAUTION: Do not lill the reservoir boyond thc
upper level line.
J.
4.
NOTE: Perform rack guide adjustment with the wheels
in the straight ahead position.
1. Loosen the rack guide screw locknut with the spe-
cialtool, then loosen the rack guide screw.
Tighten the rack guide screw until it compresses the
spring and seats against the rack guide, then loosen
it.
Retighten ihe rack guide screw to 3.9 N.m (0.4
kgf.m, 2.9 lbi.ft), then back it ofl to specified angle.
Speciliad Roturn Anglo: 20' Max
Tighten th€ locknut while holding the rack guide
screw.
RACK GUIDE SCREW
25Nm{2.5 kgf.m, 18 lbf ft)
LOCKNUT WRENCH. ilo mm079't 6 - SA50001
E
6.
Check for tight or loose steering through the com-
plete turning travel.
Perform following inspections:
. Steering operation (see page 17-18).
a Power assist with car parked.
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Inspection and Adjustment
Pump Pressure Check
Check the fluid Dressure as follows to determine
whether the trouble is in the pump or gearbox.
NOTE; First check the power steering fluid level and
pump belt tension.
CAUTION: Disconnect the pump outlet hose (high-pres-
sure line) with care so as not to spill the power steering
fluid on the frame and other parts,
1. Disconnect the pump outlet hose (high-pressure)
from the pump outlet fitting, then install the P/S
joint adapter (pump) on the pump outlet.
P/S PRESSURE GAUGE07a06 - 001mo1
OUTLET HOSE FITTINGHOSE ATTACHING BOLT11 N.m (1.1 kgt.m 8lbl.ft)
PRESSURECONTROL VALVE
P/SAOAPTER IHOSEI07NAK - SR30124
6 x 1,0 mm BOLT
lP.n ol tooll'| 1 N.m
11.1 kgi.m,8lbtftl
PUMPFITTING
Connect the P/S joint adapter (hose) to the power
steering pressure gauge, then connect the pump
outlet hose (high-pressure)to the adapter.
Install the power steering pressure gauge to the P/S
joint adapter (pump).
Open the shut-off valve fully.
Open the pressure control valve fulli.
1.
Start the engine and let it idle.
Turn the steering wheel from lock-to-lock several
times to warm the fluid to operating temperature.
Measure steady-state fluid pressure while idling. lf
the pump is in good condition, the gauge should
read less than 1500 kPa (15 kgflcm',213 psi).
lf it reads high, check the outlet hose or valve body
unit (see General Troubleshooting 17-101.
Close the pressure control valve, then close the
shut-off valve gradually until the pressure gauge
needle is stable, Read the pressure.
lmmediately open the pressure control valve fully.
CAUTION: Do not keep the pressure control valve
closed more then 5 seconds or the pump could be
damaged by over-heating.
lf the pump is in good condition, the gauge should
read at least 6,400 - 7,400 kPa (65 - 75 kgflcm',924- 1,067 psi). A low.eading means pump output is
too low for full assist. Repair or replace the pump.
P/S PRESSURE GAUGE07i.{)6 - (x)l(xrol
9.
10.
SHUT.OFF VAI.VE
17 -22
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Power Steering Hoses, Lines
Replacement
NOTE:
. Connect each hose to the corresponding line securely
until it contacts the stop on the line. Install the clamp
or adjustable clamp at the specified distance from the
hose end as shown.
. Add the recommended power steering fluid to the
specified level on the reservoir and check for leaks.
ADJUSTABLE HOSE CLAMP: (al
. Position the adjustable hose clamps at the points
indicated by (a) in the drawing below.
. Slide the hose over the line until it contacts the stop.
CAUTION: Ch€ck all clamps for deterioration or defor-
mation; replace the clamps with new ones it necessary'
HOSE CLAMP: (b)
. Position the hose clamps at the points indicated by
(b) in the drawing below.
. Slide the hose over the line until itcontactsthe stop.
2.5 - 5.5 mm(0.01 - 0.22 in)
RETURN LINE JOINT28 N m 12.9 kg{'m,2'l lbf'ft|
PUMP OUTLET HOSE(High'pressure)
37 N.m (3.8 kgtm,27 lbf.ft)
2.5-5.5 mm
10.01 - 0.22 in)2.0 - {.0 mm
10.08 - 0.16 inl
CYLINDER LINES17 N.m (1.7 kgt m, 12 lbf'ft)
PUMPOUTI.IT HOSE(High-pressure)
11 N.m11.1 kgl.m,8lbJftl
PUMPINLET HOSE(Low-pressurel
RETURN HOSE
Exc.pt Bl8Cl engino
17-34