Toro 74312 - Servicing the Spark Plugs

ServicingtheSparkPlugs
ServiceInterval:Every200hours—Checkandgap
thesparkplug(EFIenginesonly).
Every500hours—Checkandgapthespark
plug(Non-EFIenginesonly).
Makesurethattheairgapbetweenthecenterand
sideelectrodesiscorrectbeforeinstallingthespark
plugs.Useaspark-plugwrenchforremovingand
installingthesparkplugsandagappingtool/feeler
gaugetocheckandadjusttheairgap.Installnew
sparkplugsifnecessary.
TypeforEFIengines:Champion
®
XC12YCor
equivalent
TypeforNon-EFIengines:Champion
®
RC12YCor
equivalent
AirGap:0.76mm(0.030inch)
RemovingtheSparkPlugs
1.Movethespeed-controllevertotheNEUTRAL
positiontostopthemachine.
2.DisengagethePTO,engagetheparkingbrake,
shutofftheengine,andwaitforallmovingparts
tostop.
3.Removethesparkplugs.
B
A
g027478
g027478
Figure34
CheckingtheSparkPlugs
Important:Replacethesparkplugswhenthey
have:ablackcoating,wornelectrodes,anoily
lm,cracksorreuseisquestionable.
Ifyouseelightbrownorgrayontheinsulator,the
engineisoperatingproperly.Ablackcoatingonthe
insulatorusuallymeansthattheaircleanerisdirty.
Setthegapto0.76mm(0.030inch).
B
A
g027479
g027479
Figure35
InstallingtheSparkPlugs
Tightenthesparkplugsto24.4to29.8N∙m(18to22
ft-lb).
g027735
Figure36
37