Power Steering Pump Rebuild on a Honda Accord 2007 4CYL

8/13/2019 Power Steering Pump Rebuild on a Honda Accord 2007 4CYL

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RebuildingthePowerSteeringPumpfora2007HondaAccord4CYL

Disclaimer: I have benefited greatly from others who have taken the time to post auto repair

videos/tutorialsonline.Totryandreturnthefavor,Ihavedocumentedafewofmyrecentrepairs.Itryto

perform the work conscientiously in accordance with the Honda service manual, but I am not a

professional technician by any stretch so please use this material at your own risk. I hope this

informationmightbenefitotherswhoarepreparingtodothisjob.

Honda20074CYLPowerSteeringPump

Forunder$20inparts,youcanrebuildyourpowersteeringpump,

includingreplacementofthefrontbearing,frontseal,allORingsandtheslipperseals.

OEMreplacementpartsarereadilyavailableonline.


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HereisablowupshowingthedifferentpartsofthePSpump. Ireplacedthefollowingitems:

FrontBearing

(7)

FrontSeal(8)

AllORings(13,14,15,16,17,18,12,11)

RubberSealandSlipperSeal(9,10)

FrontSeal

Rotor

CamRing

OuterCase

RollPinSide

Plate

Bearing PumpHousingCap

PumpPreloadSpring

Pressure

Control

Valve

Pressure

Control

ValveCap


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#1 Remove thepulley locknut using a strapwrench and breaker bar or an impactwrench. It is a

standardthread(CCWtoloosen).


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#2RemovethePressureControlValveCap(10mmHex).

Pressure

Control

ValveCap


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#3RemovethePr ssureControlValveSprin

andPressu eControlValve.


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#4RemovethePumpHousingCap.

Pump

Housing

Cap


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#5AndremovethePumpPreloadSpring.


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#6Removethefourboltsholdingontherearpumpcover.


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#7Andhereiswhatitlookslikeinside!


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#8Pulloutthepumpvanes. Thevanesmustbeinstalledinthecorrectorientation,soasyoutakeout

eachvane,keeptrackofwhichedge istheoutsideedge. (Theoutsideedge ismorerounded,but it is

REALLYhardtoseewhichedge isroundedwiththenakedeyebettertojustkeepnoteoftheproper

orientationofeachvane).

Outside

Edge

Inside

EdgeVane


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#9IplacedthevanesonapieceofpaperwithonesidemarkedOutsideinordertokeeptrackofthe

properorientationofthevanes. Theoutsideedgesallpointtotheright.


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#10SlideouttheRollPin.


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#11PullouttheCamRing.


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#12PullouttheRotor.


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#13PullouttheOuterCase.


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#14PullouttheSidePlate. ItippedthepumpupsidedownandshookitalittletogettheSidePlate

out.


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#15Nowyouareleftwithanemptypumphousingexceptforthedriveshaft.


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#16Andhereareallthepiecesthatwerepulledout.


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#17Toremovethefrontbearinganddriveshaft,firstremovethe40mmSnapRing.


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#18Now,pushthedriveshaftandbearingoutofthepumphousing. Theservicemanualsaysthatthis

canbedonebyhittingtheshaftwithaplastichammer. Ididnttrythat,butitdidcomeoutquiteeasily

onthepressso itwouldntsurpriseme ifahammerwouldbequiteeffective. Ifyoudouseahammer,

justmakesureyoudontdamagetheshaft. Donthammerdirectlyontheshaft (hammeronapunch

insertedintothedimpleontheendofthedriveshaft).


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#20Thesealisinthereprettytightandcanbeabitofabuggertogetout. Iusedthehandylittleseal

pullershownbelowwhichmadethejobquiteeasy.


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#21 Igraduallypriedupon thesealgoingaround inacircleuntil itstarted tomove. It tookafew

minutesofworkingat it. Youmightalsobeabletouseascrewdriverandpushthesealoutfromthe

backside. Whateveryouuse,justbecarefultonotscrapeupthehousingwherethesealseatsorthe

newsealmightnotsealproperly.


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#22Andfinallythesealpullsout!

Incaseyouare

curious,thisisa

littlespringlike

partthatcame

outoftheseal

asIwasprying

onit.


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#23Nex

t,pushthed iveshaftoutoftheoldb aring.


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#24Insertthenewseal.


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#25Andpushdownonthenewsealtoseatitinplace. Makesurethetopofthesealsitsbelowthelip

ofthebearingseat. Iwasabletopushinthenewsealfullybyhand.

FrontBearing

Seat

lip.


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#26Push thenewbearingonto thedriveshaftusingasocketthatsitsonlyonthe innerraceofthe

bearingsothatthebearingisnotdamaged.


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#27Insertthedriveshaftwithnewbearingintothepumphousing.


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#28Usinganappropriatelysizedsocket(thatpressesdownonlyontheOUTERbearingrace),pressthe

bearingintothepumphousing.

Makesuretoleavea

spaceforthedrive

shafttocomethrough!


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#29Withthebearinginstalled,reinstallthesnapringwithitsradiusededgefacingout(pertheservice

manual,althoughwhenItookitoutitwasactuallyinstalledtheoppositeway).


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#30Cleanoutthe insideofthepumphousingand insertanewORing (applyPSfluid totheORing

beforeinstalling).

NewO

Ring


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#31CleanoffthepumpcoverandinstallthreenewORings(everyORingshouldbecoatedinPSfluid

beforeitisinstalledsoIwontnecessarilysaythatforeveryoneintheremainderofhiswriteup!).


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#32SettheOuterCaseontopofthePumpCover,sothattheindentintheOuterCaselinesupwiththe

holeinthePumpCover(redarrow).

AndtheholeintheOuterCaseisinthealignmentshown(i.e.notontheothersideofthepump)


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#33TaketheRubberSeal,dipitinPSfluid,andinsertitintotheslotontheOuterCase.


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#34TaketheSlipperSeal(White),dip it inPSfluid,andplace it intheslotontopoftheRubberSeal.

Thepowersteeringfluidreallyhelpstoholdthesealsinplacewhileyouareassemblingthepump.

Rubber

Seal

Slipper

Seal


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#35Carefully(soasnottodisturbthepositionoftheSeals)inserttheCamRing,keepingthecamring

tightagainsttheOuterCase inthedirectionshownbytheredarrow (tokeepthesealsfrommoving).

Also,notethatthedotontheCamRingmustbefacingUPasshown.

Dot!


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#36Hereswhat it looks likewhenyouget theCamRing inserted. If theRubberorSlipSealshave

movedoutofthegroove,thenremovetheCamRing,repositiontheSealsandtryagain.


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#37InserttheRollPinasshown. ThiswillapplypressureontheSealsandholdtheminplace.

PushdownontherollpinandslidetheOuterCase/CamRingassemblyarounduntiltheRollPinfitsinto

theholeinthePumpCover(itmightnotbelinedupperfectlytobeginwithsoyoumightneedtowiggle

itaroundabit).WhentheRollPinisfullyinserted,itshouldstickuponlyabout1/8asshownbelow.


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#38InserttheRotor(justplaceitinthere,sincethereisnothingtoholditinplaceyet!).

Rotor


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#39 Insert theVanes into theRotorwith the roundededgefacingoutward (orjustput them in the

sameorientationastheywerewhenyoutookthemout).


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#40Now,puttheSidePlateon,lininguptheRollPinwiththeholeintheSidePlate.


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#41NoticethattherearetwoholesintheSidePlate. TheRollPinshouldalignwiththeoneshownby

theredarrowbelow(itisslightlyelongated). Theotherholeisaductandgoescompletelythroughthe

SidePlate.


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#42ReplacetheORingontheSidePlate(shownbyredarrow). LubricateitwithPSfluid.


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#43Place thefronthousingon the rearassembly. It takesa littlefinessing tomate the twopieces

together. Asyouinsertthedriveshaftyoumightneedtorotatethedriveshaftslightlyfromthetopto

getthesplinestolineupallowingthedriveshaftandgothroughtherotor.


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#44Oncethehousing istogether, insertthefourbolts intherearpumpcoverandtighten inacriss

crossingpattern. Then,torqueto14ftlb.


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#45Pertheservicemanual,insertaflattippedscrewdriverthroughthePumpHousingCapandpushto

makesuretheCamRingispositionedagainsttheoppositesideoftheOuterCase.


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#46PutanewORingonthePumpHousingCap(redarrow). LubricatewithPSfluid. InserttheCap

andpreloadspringandtightendownto22ftlb.


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#47 Insert the Pressure ControlValve Spring, PressureControlValve and Cap (with newORing as

shownbyredarrow). DipthePressureControlValveinPSfluidbeforeinsertingit(perservicemanual).


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#48 TorquedownthePressureControlValveto36ftlb.


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#49PutanewORingintheoutletport.


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#50PutonthePulleyandPulleyNut. Torqueto47ftlb.Andyouredone!!!


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Disclaimer:ThisishowIthinkthepumpworksbasedonmyreading,butIcouldbeentirelywrong!

Iwascuriouswhy thewholeCamRinghad tobeable to swingbackandforth (thereby requiring the

SleeperSeal)inthispumpdesign. Itturnsoutthatthispumpisavariabledisplacementvanepump. The

CamRingslidesbackandforthtochangethevolume(displacement)ofthevanecavitiesandtherefore

controlthe

pump

pressure.

Many

power

steering

pumps

do

not

function

this

way.

Instead,

the

pump

just runsfullout (fixeddisplacement)and if thepressure is toohigh it is simplybypassedback to the

pump inputbythepressurecontrolvalve. InthisHondapump, itappearsthatwhenthepressuregets

toohigh,thepumpingcapacityitselfisreducedratherthansimplybypassingthepump.Thisisachieved

bythemovingcamringwhichreducesthepumpsdisplacement.

1.FullCapacityPumpingInthiscase,thecam

ringispushedbythespringallthewaytotheright

(bluearrow)whichresultsinlargevolumevane

cavitiesontheright.Asthepowersteeringfluidis

pushedbythevanesinthedirectionofthered

arrow,the

volume

of

each

vane

cavity

decreases.

Thisincreasesthepressureattheoutletunderthe

rotor.

2.ReducedCapacityPumpingIftheoutlet

pressuregetstoohigh,thePSfluidpressurepushes

theCamringtotheleft(bluearrow). Thisreduces

thevolumeofthevanecavitiesontherightand

reducesoutputpressure.Whentheoutput

pressuredrops

then

the

Cam

Ring

returns

to

the

higherdisplacementlocation(left).

Notice also that the PSfluid comes up through the holes in the rotor andpushes against the vanes

keepingthempressedagainstthecamring.

Outlet Outlet


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Problemsyoumayencounter:

1.ThePressureControlCapis10mmHexandisquitetight. ItmightbehardtogetoutwithanAllen

wrench. IusedaHexsocketandbreakerbar.

2.ThePressureControlCapandPumpHousingCapareprettytighttogetout. Ifyoudonthaveavise

handy,itmaybeagoodideatobreaktheseloosewhilethepumpisstillonthecar(sinceitishardto

holdthepumpwhilelooseningtheseotherwise).

3.Thesealcanbeprettystuckinthere. Workitoutalittleatatimebygoingaroundthewhole

circumferenceoftheseal. Becarefulnottoscratchorgougethematingsurfaceofthesealwhile

removingit.

Hopeyoufoundthishelpful!

JohnC.

Documents

Power Steering Pump Rebuild on a Honda Accord 2007 4CYL