EM.2-13
2.Matchingairinletvalvewithairexhaustvalve
Afterthebottomsurfaceofcylinderheadhasbeenputlevelonwork
benchandisfacingupward,airinlet&exhaustvalveswillbeinstalled
ontothecylinderheadasperthesequence“exhaust-inlet-inlet-exhaust-
exhaust-inlet-inlet-exhaust”,andcouldbeinsertedintothevalveguides
smoothlyafterinstallationwithoutanyloose.
Note Pr ior tothematching,checkthevalveguider od,
andensurethere’ snoanyknocked,scratchedordamaged
traceontheconedsealingsur faceofvalve.
3.L eakagetestonsealedpartsofvalveanditsseathole
Thecylinderheadhavingbeeninstalledwithairinlet/exhaustvalvewill
beputtoapositionforleakagetest,andthesideofcylinderheadhaving
airinlet/exhaustductmustfaceupward.Whenthetailendofvalverod
isbeingpulledbyhand,fillrelevantairinlet/exhaustductswithclean
keroseneandwaitfor(5~6)seconds,ifkerosenefromthesealingbandof
valvedoesnotflowintothecombustionchamber,itindicatesthatcylinder
headhasnoanyleakage;Incaseofleakage,thevalveanditsseathole
shallbeabradedaccordingly.
4.A br adingonvalve andvalveseathole
(a)A fterairinlet(exhaust)valveisremoved,appropriateamountof
abrasivesandsmustbeappliedevenlytotheconedsealingsurfaceofair
valveandtothevalveseathole,thenbeinstalledintovalveguideforan
abrasionbyspecialabradingtoolfor(7~10)minutes.
(b)A fterairinlet(exhaust)valveisremoved,kerosenewillbeusedto
washresidualabrasivesandsonvalve,inthevalveseathole,insidethe
combustionchamber,orinsidetheairinlet/exhaustduct.
Remark:Valvesafteranabrasionarenotinterchangeablewhenwashingthe
removedvalves,theyshallbeplacedinorderbysequencetoavoidany
mis-installationandmisdeterminationatalaterstage.
5.Pressedinstallationofairinlet/exhaustvalve
(a)A ppropriateamountofcleanmachineoilshallbetakenoutfrom
machineoilpotandbeappliedtotherodofeightairinlet/exhaust
valvesrespectively,then,havethecylinderheadfixedontoaclamping
fixtureapplicabletothepressedinstallationofvalves.
(b)Installeightvalvespringseatgasketssuccessivelyintoplace.A nd
thenumberofgasketsmustbecorrect.
(c)A specialpresstoolshallbeusedduringthepressedinstallationof
eightvalveoil-seals.
markedwithgreencolor
upward
IN
EX
Assemblyofcylinderhead
Note F or ceappliedtotheoil-sealcouldnotbetoobig,ifthepr essedoilsealdeviatesfr omthe
installationposition,itshallbetakenoutanddiscar dedaccor dingly,andmaynotber e-
usedanylonger .
(d)Putthevalvespringandthevalvespringseatintoplacesuccessively.
R emark
-Thesmallerpitchend(viz
coloredend)ofvalvespringmustbeputtothedownside.
-Differentfromairinletvalve,thespringseatonairexhaustvalvehasarotatablemechanism,whichcannotbemis-installed.
SST09202-43013
(e)Usingaspecialpresstoolapplicabletovalve,eachlockerclampofvalvemaybepressedintotheconeholeonthecapofairinlet
/exhaustvalve.
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