Inspection

Checkfuelinjectorfilterforevidenceofdirtandcontamination.Ifpresent,cleanandcheckforpresenceofdirtinthefuellinesandfueltank.

FUELINJECTORINSTALLATION

•ApplythincoatoftheengineoiltonewinjectorcushionseaJsand0-rings.

•Installtheinjectorbypushingitstraighttothethrottlebody.Neverturntheinjectorwhilepushingit.(c:::::r4-68)

FASTIDLEADJUSTMENT

Thefastidlesystemisakindofstartersystem,whichopensthrottlevalvebythefastidlecammechanically.Thefastidlecamisturnedbythefastidlecableandthecampushesthrottlevalveshaftbracket.Thebracketthenopensthrottlevalvealittletoin•creasetheenginespeed,andatthefully-pulledconditiontheenginespeedrisesto3000rpmwhenwarmedup.

•Connectatachometer.

•Startuptheengineandrunitinidleconditionforwarmingup.

•Settheidlespeedto1300rpm.

•Turnthefastidlelever(chokelever)G)fullyandcheckthefastidlesettingrpm.Iftheenginespeedisnotinthespecifiedrange,adjustitto3000rpmasexplainedinthefollowingprocedures:

1)Liftandsupportthefueltankwithitspropstay.(c::T'4-52)

2)Startuptheengineandkeepthefastidleleverinfully-pulledcondition.

3)Adjustthefastidleenginespeedto3000rpmbyturningthefastidleadjustingscrewr~.(Fastidleadjustingscrew(2)islocatedbehindthethrottlecabledrum.)

4)Afteradjustingthefastidlespeed,settheidlespeedto1300rpm.

~Fastidlesettingrpm:3000rpm

(Whentheengineiswarmed.)Engineidlerpm1300rpm

(Whentheengineiswarmed.)

THROTTLEVALVESYNCHRONIZATION

Checkandadjustthethrottlevalvesynchronizationamongfourcylinders.

CALIBRATINGEACHGAUGE

•Liftandsupportthefueltank.(c:::?4-52)

•Startuptheengineandrunitinidlingconditionforwarmingup.

•Stopthewarmed-upengine.

•DisconnecttheIATsensorcouplerCDandremovetheIATsen•

sorfromtheaircleanerbox.

•ConnecttheremovedIATsensortoitscouplerandplaceitontheframe.

•RemovetheIAPsensormountingscrew(2).

•Removetheaircleanerbox.(c:::?4-62)

•Disconnectthevacuumhose@fromtheNo.3throttlebody.

•Connectaproperrubbercap©tothenippleontheNo.3throttlebody.

4-74FlSYSTEMANDINTAKEAIRSYSTEM_-

•ConnectoneofthefourrubberhosesofthevacuumbalancergaugetothenippleG)ontheNo.1throttlebody.

!Git!09913-13121:Vacuumbalancergauge

•Connectatachometer.

•Startuptheengineandkeepitrunningat1300rpmbyturningthrottlestopscrew(£).

IACAUTIONI

Avoiddrawingdirtintothethrottlebodywhilerunningtheenginewithoutaircleanerbox.Dirtdrawnintotheenginewilldamagetheinternalengineparts.

•Turntheairscrew@ofthegaugesothatthevacuumactingonthetubeofthathosewillbringthesteelball@inthetubetothecenterline@.

NOTE:

Thevacuumgaugeispositionedapprox.30°fromthehorizontallevel.

•Aftermakingsurethatthesteelballstayssteadyatthecenterline,disconnectthehosefromtheNo.1throttlebodynipple

r----

_{I_J}

andconnectthenexthosetothisnipple.

^{•Turnairscrewtobringtheothersteelball®tothecenterline.@}_{,_,_}

•Repeattheaboveprocessonthethirdandfourthhoses.

Thebalancergaugeisnowreadyforuseinbalancingthethrottlevalves.

-

:;;.

-

1.-

_·-~I

I

l

^J_-~

_

_,^-_I

^,__-

^-0,1

THROTTLEVALVESYNCHRONIZATION

Tosynchronizethrottlevalves,removetherubbercapsG)andvacuumhoseCZ)fromeachvacuumnippleandconnectthevacuumbalancergaugehosestothevacuumnipplesrespec•tively.

1R)Ot109913~13121:Vacuumbalancergauge

•Connectatachometerandstartuptheengine.

•Bringtheenginerpmto1300rpmbythethrottlestopscrew.

•Checkthevacuumofthefourcylindersandbalancethefourthrottlevalves.

Thevacuumgaugeispositionedapprox.30°fromthehorizontal

level,andinthispositionthefourballsshouldbewithinoneballdia.Ifthedifferenceislargerthanoneball,turnthebalancead•justingscrewonthethrottlebodyandbringtheballtothesamelevel.

Acorrectlyadjustedthrottlevalvesynchronizationhastheballs

intheNo.1through4atthesamelevel.

IACAUTIONI

Avoiddrawingdirtintothethrottlebodywhilerunningtheenginewithoutaircleanerbox.Dirtdrawnintotheenginewilldamagetheinternalengineparts.

NOTE:

•Duringbalancingthethrottlevalves,alwayssettheenginerpmat1300rpm,usingthrottlestopscrew.

"Afterbalancingthefourvalves,settheidlerpmto1300rpmby

thethrottlestopscrewafterinstallingtheaircleanerbox.

THROTILEPOSITIONSENSOR(TPS)SETIINGAfteralladjustmentsarecompleted,checkoradjusttheTPSset•tingcondition.

(Refertopage4-28forTPSsettingprocedure.)

THROTILECABLEADJUSTMENT

NOTE:

Minoradjustmentcanbemadebythethrottlegripsideadjuster.

(CT'2-16)

MAJORADJUSTMENT

•Loosenthelocknuts<Dofthethrottlereturningcable~.

•Turnthereturningcableadjuster@toobtainpropercableplay.

•Loosenthelocknuts@ofthethrottlepullingcable@.

•Turnthepullingcableadjuster®inoroutuntilthethrottlecableplay®shouldbe2.0-4.0mm(0.08-0.16in)atthethrottlegrip.

•Tightenthelocknuts@securelywhileholdingtheadjusterCID.

•Whileholdingthethrottlegripatthefullyclosedposition,slowlyturnthereturningcableadjuster@toobtainacableslack'§)of

^{1.0mm(0.04in).}

•TightenthelocknutsG)securely.

SENSORS