Transcription of Walbro - Vintage Snow
1 WalbroDIAPHRAGMCARBURETORS w albrnEngineManagementA ftermarke t DivisionINTRODUCTION2 AIR ANDFUEL3 ALTERNATIVEFUELS4 TWO-CYCLEENGINES5,6 THEFUELMETERING SYSTEM6,7 BUTTERFLYVALVECARBURETORS7,8 VENTURIOPERATION8 TROUBLESHOOTING9 12 DeterminingCause9,10 :11 Poor Idle12 PoorAcceleration12 Poor High Speed:12 CarburetorDisassembly12,13 CARBURETORREBUiLD13,14 MixtureScrews13 Fuel Pump14 Welch Plug Removal:14 MAINNOZZLECHECKVALVE15-17 REASSEMBLy18 PRESSURE TESTING19 ADJUSTMENTS20 BARRELVALVECARBURETORS21WY SERIES22WZ SERIES23 BARRELVALVECARBURETORADJUSTMENTS24 AIR PURGESySTEMS25 PRIMERSySTEMS26, 27 ACCELERATORSySTEMS28, 29 GOVERNOR30 TOOLS31_____ _____Walbro Corporation 1 Asdi verseasIheW, 'Oducin ,Imanual10detailtherepairoreachspecificW aIbn>carburetorwouldbeImonumentaltask,an dthemanualwoul dbeobsole teas soon1$trwasprimed. Instead,whatwehope10dohemistoshowyouthei ndivid ualcomponentslbatam roundin . ~wcarllwnortt:dmologks,wewiDtry10keepyou up10dl\ )'Ollhave~$U~nraOditions10!
2 BeDe>.1priotin,.pl_$endUS $ $ "",Af'OTmOTkotDivi;ionWaibroEngine:Ma" aiOltl'''> 'Corporali on_TheAirf\ifIOlteninw an~" ::waJlycroacs!he~~! ,.. ~Ib<:all'is_lesswiIhouIflll' :t:lbu"""ll;Jml'SIll<:ai,10!atIIldC>.fll\lld0 QIIJIg! :rorihccllginc:.ThePounlofflCl"' "'"'00'"ofairlaI :n'1U(ltheC)'lilldct. II a small arn<1uOlora i. isdnlWfl;nll)thecylinder,tile sirden,ityisIllwlIl'IdI, < ctbeens ineis,,,~IcrKcena lnW\OIJl11ofintem,, ,tile:pow< :ngj,.,runss~ """'"ai, is3llminediNothec:ylin<b!beair<k:rl$ilybc:<:omc:sh;gllc:rlind""'"'powc:rIS p<o< loc<\IftS(ti1Cf,Ofc;alc::any bigzo'..Theairis__kediDIoeec:yIintlcr,IIisfMbcdinbyllIllQ<pbcriI; """ievclIPllcspllericprc$'S1lf(:UMs14 .7 PSIuponeve< ( <pllCricp~o:ltt'>p$ cnooghiICItlwf<)<"'..:or1, \si ne100""ahoul3,S%o[it' \halallows mOl'Cair10bepU!oodinlO~ec ng;ncOIIlllcinLakeI lI"C"'illinctc:l:\Cl/Icengine's~At"'boorsu[lCtc llo' C'inc=alrdcnsuyb ypacklnJueai linug/llCtdI:Inat<oospltcric;poe$ <lcaeasioa<heair1C/l1PC!Uw'e~all'< ,10cokletuproducc:l;llllX1:~ FuelsrusnyfueltooomnlOStcfro:icndyil '",,>!)]]
3 BeiXlffibinodwithaspcciriu:KnOlln,ofair. This1;{ICCiro:;oir/f" cl mtio"' calledthest<>ic:hionlCltie,(1mprc>.<yoorfrk" d'wi~til.:ll oocl)For ,a.",lillC, f a i'(orwoe"poondof&l'S01iO AIthismo011thea vailtblcai .iscombinedwilhalltileaoaibblcP'O'-meCOcat/ <ls0U1ortheC< "ortuBalclr , :wi!rnswvi"""""'i!l&IIlIbts..6:1f3liD; > >c:10.! ;(llclratioIMt is . bit. icb< " Olt"rIlQr&fueJ1h:lnthoc~ ~.M<>Slc~iJICs< ' :1 1012:1,,,,(Wid -ingthem"' i' ha bitorCX(c:<.'f"" >cc~traf",,1i~uSC(1to~001mecylin dercomponents<I, inceIIOme[" ':1.>100.~.rich,'lCt,ln g,emi$Sioru;archigbct.,1 IlP'J"VI"i$~Iigtli lyIc5s;W(:woOlthe:eog inellI,unjuS!ric"CIIOUgh10t CI" lhcmi"wealwhichthearl>w1:lIlri.~gc".r-a1 lrXl.(')ppositc:aI'.1 """ laO"' <>,na' ' I>c:aotbc"", $Iosc:.tl>eir0fIC".1ti ,,&tOlc"""",,aodoci .Hllfenginesareala> ,ancxplo vcnbamingor lhcruc:l"'ilhintllCc )'Ii,~ <:tOO~tinnI"'t'exu-emeIood~or,engir\e pan. c. u, i'l<:them' 0 r" ,IllI1 ICtimeIued~ IliPpM~~IDPOO )~I:be~ >of~ ~lhInp$<> ( 13ooof6.)))))]}
4 4 :1.! '=IImoref""'' ~ 13tioof9:I ,orabout\. 6 limeslkf""l-lO" )mIlChm<nalcQllollOgellks; ,..;11<"-bi'"perform-uoefud? ,"""" >goadi,.. ,.paeCIIIbe\lIIi1l1 DNI higla"""'.. ~solkenJinr:CIII prodl cIIl(Rpo'A' :ThisoffffJonbonoor4fa<a ,. kOOol,have Ih;gherlllenthelllofevlp(>-'ation. l n otherwonIs,itlal<e lmoreheatt(levaporate: 'IlI\ :il <c$! :incattair( Iherooledairisdcnsc:r)and!he~lirpacks!he~iIIlb1i&Jln,.. :nJlO'o' ~melI\aftoI";11pnldooeabouiI S"..-powo-ihaawllerl"""' lsobumO C>' ",,110getl/llleo113IS" .Thi' d,alc(J/l(llfueledenginesrun cooler~.n 150-liMeng i nes. SUI keepinmindlI1alifa n CnllineisrunOOllk<h> "" ') :encinewillberunning1_andllDuu .WallI<oarbwellllfSandcrlolll!!bekplirniuof_QbDIs~illI<ldaysIIIds:I~cWnol, I"of! '-cuMlllE(Methyl TertiaryIltitylElbc:t).Card=bIi:nd,ngQIIJ(lmCtimesnt:Al~irl~Uceedinllhc:Je1c>dsOdalocalbasi$.Yo , iallllhetipoftheinletn<>e<ile.<isno'"IredcoloredvilOf\,and1I1. 1several fuel pump madefl'lld'labrown eolored"""""nm.))))
5 """=developed10in=aselheakohol=islanoedo wcarboa" ~.,..nil~yhoftdleI~ < ~awIica1icft,..~)'OlIl;OJIl~talocal~.<IlIlpforadvia:0I:l~ >1lond iscussiononairandfuellhat (WIlydoesilm"ntaln I""'Stanlproper l ir:f",,1ralia.; ,~ro"lbolnallthevariOllSspeed!, theeIllinef~W > ",.. '''' ,.. ,..pi""'"---~,_ ,.fIIlng"'".,",,~..,,..I\ ""'"""~"'""OM'"_to,_k>ol-_.,-'.. ,.,.I'.. 1 EFli/oIGOIAPHAAGIIREEDVA LVEI~OUCTlOllFUELPUMP~ ,~=INTAKEAlRc::J. 0,~.pi""'"_ _"P,"~0l>o<I<00""'""';~,..-" ,.._,,""-,..~-PISTONPOIlllNOUCJ1 OOIREPl ' 01' , "ar'lL3i<'ofthe2<ydeengino:.sinceildoesn' tR;:ly00 p' \L' ;UUle, :" (lJICl'alCInIllyPQ$iUon_laonIerII>ope:tlIleinanypo')liIioon,LbeS)'SlOtllSo onn:aIIydependingan&n'".y( """ '".yRowfuel$)"..)nec:d10beIq:h:ul"'iIhme clIani aIdc>' ~~ "melerilocdi1pho4llla:ldIISCS" fuelpumpilIp1 Inductio n on t heTwo-CycleEngineTheR;:lifelhrocbasicfor msdindoctioo""the2_t)'tleengine:n:Ka/)'" a1ve.'"'""val""andpisIoIlporICd,We' lldil:l:1 ISS'"'""valveandjlisIonponbcresinceIhe$e _!
6 Bemost00Ih0II<lIIilltbl:. ""lYeSarer:eneraJlyfwndoaly011 IlIlltOII:yI:IQand_ ~ist~by! >,but".! \ !be" ~asaDa:aleJ'Il'llJIinI.~pumpoi:lgiscnadb yeepU-lI' :bl01pIasIic:malislIKIlI1O~ :IOI,anddoeso',RowbackllW011ee~lUtlkeo/i bepi$lon.~piSlOQportedeagine arlowl! ,."' ~TheFuel PumpSystem'"'"pQ<I'Cf10llJlt>"EIbefuelP< ,vac:uwnpul$l:smaw:! 'elIPofthediafllIrI&mbubbleand"JerieIalelleck valYel-The:ruelpumpptOYldespeasun:lYbicb!beJCSI oflbearbureaordepends( $",ialO!becylinderiltrealCl low~IrQin! , ,.,""'" JthroogI!\!Ieimpulse~anddrawsupanlllepump d; aphragmcteating ."lIC<, ~JDeri;;airpr=;ser-lowod;nlO!hefuelLankStld pusbe<thefuelLhrooghucfoc1fillct. 1hefucllino:. " a1" . " acuumda",,"thefuelplJmp' sd1 IChargc checkvalve-- Walbro Corpornt;on56 WalbroCorporationA<IthepiElOJlmova"""..iew\ :ssuriZ dai<lQ>'C1slllrllu&h\Ill::impulse~imoIhcQlburao rfuelpum(l;~IllcRJlf='C'..tollthediapln& al~! >ClrllcllbtadolatheiliaVIII""and"""'"the ~oa!\'eia1llefuelI* ! ",,, ,.. ,..importantjobasthefoalprov;;aionapillS ldiniIllheint.))
7 >nJlIIIC btoll"'iththefuelI'iltcr."Ioclcdbytheeng ,ncD",n~f:O: nee ,lIeIIl1t! &"" 1. o oornlfLJ< :."~Tburcl() ~es!\ !heybeIngOO<lcondilionr[llthe emrt10<10fulI"t io"pr<!llCrly.' ~tobequil :"""IIto=lbacl:tlle~ ,theinldnoedlc ..""'"an>~lible10Ie: '>cabun::lnr1"'illeilJ>crhlYe ~1IC:I11$1dtd(ldlyItxCUOcorDl3 Illlfanlll'ill&:it$klnld_heprt:MIl:dIIIl Il"'~~TheFuelMeteringSystemlbcrc~rowCOfl 1pool<.'nl>It>thef",,1meu:rin&&ystcm:J)lheMC\Cl'inK Di:lphragon:2)theMel :ri" gLever; 3)11>cMeterin g Spll ng;ouxl4) thcInkl me\Cling diaphragmi,a" cry:;cmil lve,Ie>"e. IIm,lSI, >OI'o(li",luntty toslig lnchang<:.'!IIItlocf'lCl>acu"mwithinloo n'c\ " :di~phrag", nilriIerubberoompound0'IC<"'o w:nsill: ..ilbtheoon,."loitioomol<l<dIntoallowfOf1:""'1'"~IDCDLAJt,lTener1~31candbu''''''an::1 Ilt3 CbcdattheCCl\lCl".IkaUll'lhediaphr3gmml,lSlrupond10ca:..inl:lI:~wntc0(IIIeDl(ine,i l""'"beofkpmJD'~lIIld~Ali< ;t;, ~ ::.ogltat' !t,p>p< !CllngIt:-er""'1Sl"ct' ;"Ianealk:. ]l";",,,~; "n\heengineisnmnirl.
8 Themtlor1ng leverIb;,; ; . inooIhcocctll" ' ipiJUU,ltll'rC"'>lfCfro<11lhc ,sun'tl,c.$C:>tasSOOlIas!hemclCrin~tliapl1""l'"(r:lYCI ~ """I<lQVcrri<1cthe$ ':force.:. isvel)"inlpc:u:1 JlUincommUing"" ,IICIIlJOItl(; '13)'fIII1nclt:1(11islOlllowthecn& ~..--- ~+~::;j;.-+-''-,- - ----Id leOnce11M:encitre:SI3llS. Ihedd:.1$opmtdancllhe~""i .0lIl,,,,..Idle:. >o'prtSSlIrcIlIIIhI:CtlI'tre:p;jcofthepla Ic"'"1"g11pCSlUr.(. :pressure) :ssure. itIlowsinllllhc:,.,.maift'",""'nsil \heidlepo<kc' .F"" \heidlepodrciin lOLIlclowpressure0",b;on~ioelide:.ofllICIlll' ::. :ruel il drawn001oflheid lepockelilcll:.:llOSa ..".,J"l'SSurcIhl'Q\ :m<l<rinS. ys-lrm."'Ul'lOS(lllcricair. :<o nlhe""''''insdi3I"'r3& ~nl~onIh\l""'",nngk.,c1,releasingtheJPring~ofr1t1cink!seeneallowingcnooghfucllO~,"n.:In 10rej>lacclhIl(ucld,..~wn0Il1on'l':llwllI:.?St artUpThc:<:n&iKllSI3I\upllaslnumhl:.alrequ~ :.., :I<:oldCtI&iI\CisIlOl"".fT~ <nu3ebcais oequimllOv~liquid.~spccds_"' \owllwou&hllM:carbumoris_SUOIIfIeftOUCb10m:ab:ridf\owintolI> 'ylbcsc1M>.)))
9 ,. $~.. "'"-wIlidoiBjma"'IrapsIOI_""0 LIlc~ ; , .. ,.__01psaIinl:10 CIlICI' "" >'ElIIIIII cadeSalllhcGIIO IrodIIDnlts10deli"".Lhc:fuel_lhc:1Dl> $prin~~ , iml,lydo'lethe,nlelneedl . IIalsohelps<klCrm;rclhcI ccelel:\ lionanddc:",le'alloncb:uac1e,,"1csofd> >lJrin~musta11(lWLhc:v31""100flCnatjU!il eeliihln>ornetI1onaexel"",uonorLIlcengl" "wfllstumble,andIImUSIdose~lll>cliihl '. "l'Wtom;sinlllin11M:propermole';"l sprin,inlhee~1O<,W. ' ll IookluhemClCri",,J)'lWft""ilrunctionswilliIheetIlincarbuttlor,_ __ _ _~--_----------------------- Walbro Corporalion7 Operation 0 1a VenturlWeauempilOfOR"II>;:same amountofairthroughliK:rcslfictioaoftheve nturiasis" naturally"nowjngthroughlheLurgerf,OI\(an dbackolll>ccarburetorlhroalTogelthe<&nil 'amoonlofai r lhroughasm:alJcr""".IN;: ~.;1$Il'= :$SUfec=K:dIIlhe~drlowsrllcloutoflIlelI\ UIllO< eOperationAsIhcIhroulepIaeisopenodfanher ,illwItsselfoct""!heIocatioaofIhc:highan dlowprc$Sllfeareaswilllin!heca rburetorlhl' idc-opcnIhtOl~ k lyrushes lhrough(hecartcreu ~airrefills!))
10 Heeylin< :> ;lke'o'3 Cuumis~,thereisnotmoo:"..pr=lftair(wxuum )wilh m thecaobun:& ~lOamuabeat:MCdori!tliaLIle1brOII10 ) ilb ()'reDependin&0< mayOf11'131notdeliverfuel I'w~ntlll' :dfanha' \heproperaif,.. r""" m""from!heidleprognmionhole LOnm<>:Itdiaphragmcarbuteto<s0()aircomesOUtof!bepm-gre<sionholesatpartlhrQltk.~re"'"somedill phngmarburetOnthaldohaveanairbleedfor!heidlecin:uiLT1lcIeusuallyappellIasa \heOU/:$ :albeIpt10-=I!acfudII'dhelps~ ,ifoldpoddlin&-Pulldlin&islbebuild", ;n& ~ccemai~ro>;>lebeginltoCOO Vi~UlefLlCI,== ..----lOWPRESSURE----- HIGHVElOCITY-1'.8 WalbroCorpctl<Ition-----ne~icbspeedaoulcispr ~ioncdJO"'" ( ,"'"<:arburtvlI>nloLMai nNou le '..c ..Ift$ ""'..,;~isMidle_""'"lhrollle,aBdi l ~,.." '.;I""'~"&i""isMmuliumaBdfullIhmUI<:.Toprt:"CIlIhigh1'f"S'i~tiratidlefroml> ;ngbackinL<>fu<1passagell(which"' oulddc< "w<;)."'emuSIplaceacOcck val.,einl!leltighspeedfuel passageiU$I, ""'illnouJe) .lbeeh<ck,,..,allow,ther""II<>~the"'ai" ,bIndoesnot", ~klokedMwh:nh3ppcnswilhin""'arbu <JpeftI!
