Toro ProCore 648s - Servicing the Spark Plugs

3.Slowlyaddadditionaloiltobringthelevelto
theF(full)markonthedipstick;refertoEngine
OilSpecication(page72)andCheckingthe
Engine-OilLevel(page72).
Important:Donotoverllthecrankcase
withoil.
4.Installtheoil-llcapanddipstick.
ServicingtheSparkPlugs
ServiceInterval:Every200hours—Checkthespark
plugs.
RemovingtheSparkPlugs
1.Preparethemachineformaintenancereferto
PreparingtheMachineforMaintenance(page
65).
2.Pullthewiresoffthesparkplugs(Figure163).
g004207
Figure163
1.Spark-plugwire2.Sparkplug
3.Cleanaroundthesparkplugs.
4.Useaspark-plugsockettoremovebothspark
plugsandmetalgaskets.
CheckingtheSparkPlugs
Spark-plugtype:ChampionRC12YCorequivalent
AirGap:0.75mm(0.03inch)
1.Lookatthecenterofbothsparkplugs(Figure
164).Ifyouseelightbrownorgrayonthe
insulator,theengineisoperatingproperly.A
blackcoatingontheinsulatorusuallymeansthe
aircleanerisdirty.
Important:Nevercleanthesparkplugs.
Alwaysreplacethesparkplugswhenthey
haveablackcoating,wornelectrodes,an
oilylm,orcracks.
g326888
Figure164
1.Sideelectrode
3.Insulator
2.Centerelectrode4.0.75mm(0.03inch)air
gap(graphicnottoscale)
2.Checkthegapbetweenthecenterandside
electrodes.
3.Bendthesideelectrodeifthegapisnotcorrect.
InstallingtheSparkPlugs
Ensurethattheairgapbetweenthecenterandside
electrodesiscorrectbeforeinstallingeachsparkplug.
Useaspark-plugwrenchforremovingandinstalling
thesparkplugsandagappingtool/feelergaugeto
checkandadjusttheairgap.Installnewsparkplugs
ifnecessary.
1.Threadthesparkplugsintothespark-plugholes
oftheengine.
2.Useaspark-plugsocketandtorquewrenchto
torquethesparkplugsto27N∙m(20ft-lb).
3.Assemblethespark-plugwiresontothespark
plugs(Figure165).
g004207
Figure165
1.Spark-plugwire2.Sparkplug
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