Cylinder HONDA INTEGRA 1994 4.G Owners Manual

System Description
Steering Gearbox
The rack-and-pinion type steering gearbox has a valve unit incorporated with the pinion to control the steering fluid pres-
sure. Steering fluid from the pump is regulated by a rotary valve in the valve unit and is sent through the cylinder pipe to
the power cylinder, where hydraulic pressure is applied. The steering fluid in the other side of the power cylinder returns
through the cylinder pipe and valve unit to the reservoir.
VALVE UNIT
CYLINDER PIPE
POWEB CYLINDER
Valve Unit
Inside the valve unit is the valve, which is coaxial with the pinion shaft, and controls the steering fluid pressure. The valve
housing is connected with the fluid pipe from the pump, return pipe to the pump, 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 insened 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 to the torsional strength of 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 lunction as an ordinary rack-and-pinion type steering if the steering fluid is not pressur-
ized because of a faulty pump.
VALVE
Difforcnco in .ngl. bo{w€cn thainput shalt rnd pinion !h.tt
ln-1
B
lEngag€ with the pinionshaft groove)

17-8
INPUT SHAFT

Pressure Control
Low assist at higher speeds:
When steering resistance is low. such as when driving at high speeds. or when driving straight ahead, the input shaft is
near or in the neutral position, so there is little or no flow to any of the power cylinder orifices, Most of the feed pressure
trom the pump is bypassed to the reservoir. Because of this, the pressure stays the same in both sides of the power cylin-
der, resulting in low or no assist.
vaz =- S\->/-\7/RETURN PASSAGE(To RESERVOIRI
VALVE UNITINPUT SHAFT
High assist at lower speeds:
When steering resistance is high, such as when driving at low speed, or when turning the wheel with the car stopped, the
difference in angle created between the input shaft and the valve opens the fluid passage on one side, and closes the fluid
passage on the other side, at each pair of orifices. The fluid pressure increases in the side of the power cylinder fed by the
larger 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 the
input 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 and
power assist decreases when the steering effort would normally be low, (for example, when driving at high speeds or
straight ah€ad).
FLUIO PASSAGE TOPOWER CYLINDERFrom PUMP
A
/t-:\
v"
=iJ
RETURNPASSAGE
FLUID PASSAGE FROMPOWER CYLINDER
ALVE F.om PUMP
RESERVOIR

Troubleshooting
General Troubleshooting {cont'd}
Assist (excessively light steering) athigh speed.
Shock or vibration when wheel isturned to tull lock.
Wheelwill not return smoolhly.
ll the problem is not corrected byadjusting th6 rack g!ide. adjustthe front wheel alignment (see
section 18).
Check the rack guido proper ad'justment (see pago 17-21).
Check the rack guide tor properadjustment (ses psge 17-21).
Rack guide is adjusted prop€rly.
lf th€ problem is not correct€d byadiusting the rack guide, roplacethe gesrbox.Ch6ck the belt tor slip and adjustas nocessary (see page 17-20).
lf oither one or both of the cylin-der pip€ A and B is/are deformed,rsplace,
lf the cylinder pip6 A and B arenormal, remove the gearboxfrom th€ f.ame and mossure thepinion torqug on the gearbox.
It should be 0.7 - 1.2 N.m {7 - 12kgf.cm, 6 - 10 lbf.in) or belowwith the sleering rack in thestraight ahead driving position.
lf lhe measurem€nts are out ofspecilications. adjust the rackguid6.
ll ihe problem is not corrected byadjusting the rack guide, replaceihe gearbox.
17-12

Troubleshooting
Noise and Vibration
NOTE: Pump noise in first 2 - 3 minutes after starting in cold weather (-20.C, -4"F or colder) is normal.
Humming
Rattle or chattering
Right cylinder end soal squeak
Pump noise. though not loud,lrom the vslvo bodv unit can be heard when turn-ing the steering wheel right or left. This is normsl.
Humming due to pulsation ol fluid is no.mal, paniculady when wheel is turnedwith ca. stopped.
lf equipped with automatic trans-mission, the hum could b€ tor-que convener or pump notse.
Confirm by temporarily removingpump b€lt.
High pressure line touching theframe,Reposhion tho line.
Loose steering shaft connector.tie-rod, or balljoint.Check and tighten, or replacepa s as necessary.
Column shaft wobbling.Replace column assembly.
Check the rack guide for properadjustment (16o page 17-21).Adjust, if n€ca€ssry.
Rattling sound and feeling when turning the steoring wheel right and lett with thoengine OFF is a sound when th6 valve unit contacts tho stopper. This is normal.
Striking sound wh6n turning the ste€ring whoglfully right o. left is a sound whenthe r6ck end contacts th6 stopper. This is normal.
17-14

Troubleshooting
Fluid Leaks
Check the gearbox assembly for oil leaks carefully. Oil can leak out of various points. depending on location of thefaulty oil seals/seal rings. Check the following before removing the gearbox from the frame.
Steering GearboxLeaking from the oil seal on thetop of the valve housing.Roplace the valve oil seal fromthe valve housing.
Leaking from cylinder end intoleft tie'rod boot.Replace the valve oil seal lromthe pinion shaft.
Reolace the cvlinder end seal.
Leaking from cylinder end intoright tie rod boot.
Tighten attaching bolts or replacethe valve body unit or gear hous-Ing.
Leaking from the vslve bodyuniVhousing mounting soction.
Tighten connector. It still leaking.replace the pipe, cylinder orvalve housing unil.
Leaking from cylind6r pipe A or Bconnection (at tlare nut).
Leaking caused by damaged cy-linder pipe A or B.Replace the cylinder pipe A or B.
Leaking from feed pip6 andreturn pipe of the valve body unit(at flare nut).
Tighten connector. lI still leaking,replace the pipe or valve housIn9,
17-16

Steering Gearbox
Removal (cont'dl
Remove the return pipe clamp from the left side of
the rear beam. and move the return piDe above the
steering gearbox.
Remove the rear beam brace.
Remove the left tie-rod end, then slide the rack
the way to the right.
11.
12.
RETURN PIPE CLAMP
13.
I.TFT TIE-ROD END
14. Disconnect the two lines from th€ valve bodv unit
on the steering gea.box.
CAUTION: Aftor dkconnccting tho ho3o and pip.,
plug or r.d thc ho3. rnd pipc whh I pioco of tapo
or .quivll.nt to prcvont torcign m!tori!|3 f.om
ritrdng thc vdv. body unit.
NOTE:
. Place the pipe disconnected in the previous step
at the rear side of the gearbox so that they do
not hinder in the gearbox removal.
. Do not loosen the cylinder pipes A and B be-
tween the valve body unit and cylinder,
RETUR]T HOSE
15. Remove the steering gearbox mounting bolts.
GEARBOX MOU NNG BOLTS
17-46

Remove the cylinder pipe A and B from the gear-
box.
Drain the fluid from the cylinder fittings by moving
the steering rack back and forth,
Remove the two flange bolts, then remove the valve
body unit from the gearbox. {See page 17-51 for
valve body unit disassembly.)
FLANGE BOLT
CYLINDER PIPE B
VALVE BODY UNIT
11.Drill a 3 mm {0.12 in) diameter hole approximately
2.5 - 3.5 mm (0.10 - 0.14 in) in depth in the staked-
point on the cylinder.
NOTE: Do not allow metal shavings to enter the
cylinder housing.
STAKEO POINT
D.prh:2.5 - 3,0 mm 10.10 - 0.12 inl
CYUNDER END
12. Install a puller yoke to the stesring gearbox. Clamp
the puller yoke in a vise with soft iaws as shown,
then loosen and remove the cvlinder end.
PULLER YOKE:Commercirlly AvrilabloSn.p-Ono T/N qrie'-1
oTclo T/N 7372
(cont'd)
17-49

Steering Gearbox
Disassembly lcont'd)
13, Set the gearbox in a press so the gear housing points
upward.
14. Installthe flange bolt into the end ofthe steering rack
until it bottoms in the hole, then back the flange bolt
out 1/4 turn. Hold the tlange bolt and tighten the
flange nut against the rack by hand.
15. Press the cylinder end seal and steering rack out of
the gearbox,
NOTE: Hold the sreering rack to keep it from talling
when pressed clear.
VINYL TAPEPre$
I
12 mmFLANGE NUT
STEERINGGEARBOX
16.Remove the soecial tool and cylinder end seal lrom
the steering rack.
17-50
17.
CYLINDER ENOSEAL
18.
Remove the 12 mm bolt and nut from the steering
rack, then install a 24" long.3/8" drive extension, and
the special tool into the cylinder from the gearbox
side.
CAUTION: Be caretul not to damagc th€ in3idr
surface ot ths housing with tho tool3.
Set the gearbox in a press, then press out the cylinder
end seal and backup ring trom the gearbox.
CAUTION:
Ksep the tool straight to avoid damagingtha cYlind.r
wall. Chsck tis tool angls, and corr€st if nrcolrary,
whsn rsmoving the cylinder end seal.
Use ! prors to r6movo tho cylinder end rgal. Do not
try to remove the soal by 3triking ths tool. h will
break the brckup ring and tho cylind€r end leal will
romain in ths gsarbox.
2it" LONG 3/8" DRIVE EXTENSION:Comm€rcirlly Availobl.
CYLINDER END SEALREMOVER ATTACHME?ST
19. Carefully pry the piston seal ring and O-iing off the
piston of the rack.
CAUTION: Be careful not to damags th€ insidc ot
seal ring groove whgn romoving th€ seal ring.
Replace.

Reassembly
NOTE:
. Clean the disassembled parts with a solvent and dry them with compressed air. Do not dip the rubber parts in a sol-
vent.
. Always replace the O-rings and rubber seals with new ones before assembly.
. Apply power steering fluid or steering grease {HONDA P/N: 08733 - 8070E) to the parts indicated in the assembly pro-
cedures.
. Do not allow dust, dirt. or other foreign materials to enter the power steering system.
. Use the appropriate specialtools where necessary.
FLANGC BOLT20 N.m 12.0 kg{.m, lil lbt'ftl
CYLINDER PIPE A26 N'm (2.7 kgf.m, 20 lbf.ftl
VALVE I{OUSING
BOLI..ER BEARINGReplace.
VALVE SEAL RINGReplace.+-cncl|P
RACK GUIDE SCREW
S1IEVE SEAI RINGSReolace.
SITEVE
BACKUP RIM}
VALVE SEAL RINGRaplacs.
O.RINGReplac€.LOCKNUT
CYLINDER HOUSING
O-RINGBACKUP RING Replace.
\
PINION SHAFT
SHIMS
O-RINGReplace.
CYUNDER END SEALReolace.GEAR HOUSING
CYLINDER END SEALReplaco.O.RINGReplace.
I
x nd#$Y
IPISTON SEAL RINGReplace.
STEERING RACK
(cont'd)
17-53

25.
26.
Coat the piston seal ring guide with power steering
fluid, and slide it onto the rack, big end first.
Position the new O-ring and new piston seal ring on
the special tool, then slide them down towards big
end of the tool.
NOTE:
. Do not over expand resin seal rings. Install the
resin seal ring with care so as not to damage
them. After installation, be sure to contract the
seal ring using the special tool (sizing tool).
. Replace piston's O-ring and seal ring as a set.
Pull the O-ring off into the piston groove, then pull
the piston seal ring off into the piston groove on top
of the O-ring.
PISTON SEAL RING
GUIDE07GAG - SD,OI00
28.
30.
O.RING
PISTON SEAL RING
Coat the piston seal ring and inside of the special
toolwith power steering fluid.
Carefully slide the tool onto the rack and over the
piston seal ring.
Move the special tool back and forth several times
to make the piston seal ring fit snugly in the piston.
PISTON
E
PISTON
31.
32.
Coat the sliding surface of the special tool and new
cylinder end seal with power steering fluid.
Place the seal on the special tool with its grooved
side facing opposite the special tool.
Grooved side.
CYLINDER ENDSEAL SLIDER0797a - 6890801
Apply a thin coat of grease to the inside of the spe-
cial tool, and install it on the steering rack.
CAUTION: Make sure the rack teeth do not tace
the slot in the special tool.
SEAL SLIDER0t974 - 6890801(cont'd)
CYLINDER END SEAL
CYLINOER END SEAL
17-57