韩国现代资料NVH2图文精Word格式.docx
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韩国现代资料NVH2图文精Word格式.docx
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4Frontbrakediscthicknesscheck
1.Usingamicrometer,measurediscthicknessateight
positions,approximately45°
apartand10mminfromthe
outeredgeofthedisc.2.Ifthediscisbeyondthelimitsfor
thickness,removeitandinstallanewone.Ifthickness
variationexceedsthespecification,replacethebrakedisc
orturnrotorwithonthecartypebrakelathe.Besureto
followtheexactbrakelathemanufactureinstruction.
※Brakethickness
utcheck
nraisethe
caliperassemblyupwardandsecurebyusingwire.2.
roove,cracks,andrust.
3.Placthe.
◈whenthwtybestoencyrangeofclutchjudderis10~20Julutchpartialengagementiskeepingwhenclimbinguphillorwhenthevehicleisoverloadedcondition.Thevibratingforceisrelatedwith;
1.Thefrictioncharacteristicsoffacingmaterialandrun-outoftheclutchdisc.
1ntheclutchhousingusingthe
leakageinenginerearbearingoilsealand
partis
tact,thepressure
-Standardvalue:
26.0mm(1.024in.
-Limit:
24.4mm(0.96in.
-Thicknessvariation(atleast8positions:
The
differencebetweenanythicknessmeasurements
shouldnotbemorethan0.005mm(0.0002in.
5Frontbrakediscrun-o1.Removethecalipersupportbolts,theInspectthediscsurfaceforgCleanthediscthoroughlyandremoveallrust.
eadialgaugeapproximately5mm(0.2in.from
outercircumstanceofthebrakedisc,and
measuretherun-outofthedisc※Limit:
0.03mm(0.0012in.
ClutchJudderTheclutchjudderisproducedeclutchfacingmeetstheflywheelithabnormalcontactorpartiallyengagedespeciallysppedwhentheclutchisengagedcompletely.ThefrequHzapproximately.
artingthevehicle.Juddermadderisoccurredmoreeasilyifc2.Differentheightornotonthelineofdiaphragmspringfingers.
3.Incorrectinstallationofclutchreleasecable
Inspection-Clutchcoveranddisc
1.Cleanthedustovacuumbrushordryfloorclothandoughtnotto
usethecompressedairabsolutely.Checktheoil
transaxlefrontoilseal.Ifitisleaked,replacethem.
2.Thefrictionsurfaceofpressureplatemustbeequalizedtoentirediscsurface.Ifany
excessivewearatthepointofconplateisinstalledincorrectly.
3.ging,partialdamage,smallcrackand
4.ndsorgloves.Replacetheclutchdisc,ch,ifit
5.forexcessivewear.
6.ressureplatewithcleaningsolvent.
ofwear,cracksanddiscolored.
2releasebearingcontact
surface,thlSCheckthefrictionsurfaceofflywheelforcolorchanwear.
Donottouchtheclutchdiscwiththecontaminatedhaifthefacingisstainedwithoilorgrease.Measuretherivetsinkandreplacetheclutislessthan3mm.
CheckthehubsplineandtorsionspringofclutchdiscCleanthefrictionsurfaceofp7.Measurethepressureplate.Ifitexceeds0.5mm,replaceit.Checkthepressureplatesurface8.Checkthatthethree-dowelpinsontheflywheelareinstalledcompletely.
Installation
Wheninstallingtheclutchassembly,applymultipurposegreasetoereleasecylindercontactsurface,grooveofthereleasebearingandclutchreleaseeverfulcrumcontactsurfaceoftheclutchreleaseforkassembly.
pecified
Grease:
CASMOLY
L9508-InspectionProcedure
-TroubleshootingChart
Aswediscussedearlier,StructureBornevibrationsarethoseweprimarily“feel”withoursenseof
touchandarenormally1000Hzandunder.Diagnosingsomeoftheseconditionscanbeverystraightforward.However,somecanbechallengingandrequireadegreeofdetectiveworktoensureapositiveoutcome.
Forinstance:
Acustomerreportsasteeringwheelvibrationbetween100and120km/h.thetechniciantestdrivesthevehicleand(duringthetestdrivedeterminesitisawheelimbalance.Afterbalancingthetires,foronereasonoranotherhedoesn’ttestdrivethevehicleafterperformingthebalancejob.Thenextdaytheservicemanagercallshiminandhehastoexplainwhythecustomercamebackwiththesamevibration.LaterhefoundouttherightfronttirehadhighRadialForceVariationandhadtoinstallanewtire.Ifhehadtestdriventhevehicleafterperformingtherepairattempt,hewouldhavefounditdidnotrepairtheconditionandwouldrequirefurtherdiagnostictime.
Alwaysverifyyourrepair.Also,trytolookateveryconditionfromafewdifferentanglesandquestionyourselfonhowmanydifferentwaysthereportedconditioncouldmanifestitself.Thiswillsaveyoutimeinthelongrun,reducecomebacks.
[Definitions]
RadialForceVariation(RFV:
Radialforcevariationistheamountofchangeinstiffnessofthesidewallandfootprintwhenaloadisplacedagainstthetire.Tounderstandtheeffectsofradialforcevariation,imaginethetireasacollectionofspringsbetweentherimandthetiretread.Ifthe“springs”arenotofuniformstiffness,avariedforceisexertedontheaxleasthetirerotatesandflexes.Thiscreatesavibrationinthevehicle.
Toproperlymountatireonawheelrequiresabitofknowledgeaboutthemarkingsonmosttiresandwheels.Mosttiremanufacturersmarkthetireswithareddotand/orayellowdot(consulttiremanufacturerfortheircolorcodingcriteria.Thereddotusuallylocatesthetire’sstiffestRFVspotandtheyellowdotusuallyrepresentsthetireslightestspot.
Moststeelwheelmanufacturersmarkthewheel’sradiallowpointwitheitheradimpleorapaintdot.Theideaistomountthetire’sreddotwiththedimpleonthewheelormountthetire’syellowdotwiththevalvestem(usuallytheheaviestpointonthewheel.Ifthereisaconflictwiththetire
havingbothcolordots,alwaysusethereddotmounting.
Remember“Redisright”.Ifyouaremountingthetiresonalloywheels(orthewheelshavenoidentifyingmarkings,checkthewheelonthebalancerwithadialindicatorandmarkthelowestspotonthewheel.Whenyoumountthetiretothewheel,alignthereddotonthetirewiththemarkyoumadeonthewheel.
ThereddotonthetireisthepointofgreatestRFV
andisalignedwiththelowestradialpointontherim,
notwiththevalvestem.
Toachieveabetter“matched”tire/wheelassembly,youcanrotatethe
stiffestpointofthetiretolineupwiththelowestradialpointofthewheel.
Optimizingfornoisewouldprobablygiveusaradialplytirewithathin,straight,lightlyribbedtread,amediumstiffness-higheraspectratiocarcass,andslightlyhigherpressure.
Asdetailedinthetableoptimizingfornoisewouldcauseustoloseintheareaofwear,ride,handling,wettraction,andimpactandcutresistance.
-TroubleshootingChart
◈MiscellaneousStructureBorneNoiseVibrations
Mostotherstructurebornevibrationsareprimarily
associatedwithbrakes,exhaustsystems,drivetrain,
suspensioncomponentsorinteriorpanels.
Thesecanbesomeofthemostchallengingnoise
vibrationstoisolate.Largeplasticinteriorpanels
canpickupandamplifystructurebornevibrations
formvirtuallyanywhereinthevehicleredirecting
yourattentiontoasymptomoftheunderlying
causeandnotthesourceofthecondition.
Ifthenoisevibrationisengineorroadspeeddependentandcausingtheinteriorpanelstovibrate,comparethevibrationswithanothervehicleofthesamemodelandyear.Iftheentirevehiclestructureisvibratingmorethanthecomparisonvehicle,doathroughvisualinspectionoftheentirevehiclelookingforaccidentdamageoritemsthatmayhavebeenpickedupfromtheroadwayandjammedintotheundercarriage.Ifnothingobviousisfound,usetheNVHtoolstoisolatethecausebyconnectingtothecomponentsonthefollowings:
-Enginespeeddependentvibrations&
repairs
1Engine/transaxleassemblyandallmounts
:
Repairengine/transaxleasnecessary.Replacebrokenorweakengine/transaxlemounts.
2Radiatorandallmounts(lookfortheradiatorcontactingbody/chassiscomponents
Repairradiatormountingbracketsasnecessary.
3Exhaustsystem(includingmountinghardware/bracketsandcomponentconnections
Repair/replaceaffectedexhaustcomponents.
Replacedamagedormissingmountinghardware.
4Steering,A/C,ATMandhydraulichoses(maybecontactingbody/chassiscomponents
Repositionhosestoeliminatebody/chassiscontact.
Replacedamagedorbrokenmountinghardware.
-Vehiclespeeddependentvibrations&
1Control/Trailingarms
Replacedamagedsuspensioncomponentsasnecessary
2Knuckle(asclosetowheelbearingaspossible
Replacewheelbearing(sasnecessary
3Transaxle(asclosetodifferential/axleconnectionaspossible
Repair/replacetransaxleasnecessary
4Reardifferential,centerbearing,DOJ,U-jointsandtransfercase(4WD
Replacetransfercaseordifferentialasnecessary.Replacecenterbearing,DOJ,U-
jointsasnecessary.Balanceorreplacedriveshaftasnecessary.
◈Automatic
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