Toro 74953 - Servicing the Spark Plugs

ServicingtheSparkPlugs
ServiceInterval:Every100hours
Makesurethattheairgapbetweenthecenterelectrodeand
thesideelectrodeiscorrectbeforeinstallingeachsparkplug.
Useaspark-plugwrenchforremovingandinstallingthespark
plugsandagappingtool/feelergaugetocheckandadjustthe
airgap.Installnewsparkplugsifnecessary.
Type:NGK
®
BPR4ESorequivalent
AirGap:0.76mm(0.030inch)
RemovingtheSparkPlugs
Important:Thefastenersonthecoversofthismachine
aredesignedtoremainonthecoverafterremoval.
Loosenallofthefastenersoneachcoverafewturnsso
thatthecoverisloosebutstillattached,thengoback
andloosenthemuntilthecovercomesfree.Thiswill
preventyoufromaccidentallystrippingtheboltsfree
oftheretainers.
1.Stoptheengine,removethekey,andwaitforallmoving
partstostopbeforeleavingtheoperatingposition.
2.DisengagethePTO,movethemotion-controlleversto
theneutral-lockedposition,andsettheparkingbrake.
3.Removethehydraulic-unitshroudandthe2bolts
attachedtoit(Figure50).Thisgivesyouaccesstothe
frontsparkplug.
G012432
2 1 2
Figure50
1.Hydraulic-unitshroud2.Loosenthese2bolts
4.Removethesparkplugs.
G008803
B
A
g027478
Figure51
5.Installtheleft-handhydraulic-unitshroud(Figure50).
CheckingtheSparkPlugs
Important:Nevercleanthesparkplug(s).Always
replacethesparkplug(s)whenithas:ablackcoating,
wornelectrodes,anoilylm,orcracks.
Ifyouseelightbrownorgrayontheinsulator,theengineis
operatingproperly.Ablackcoatingontheinsulatorusually
meansthattheaircleanerisdirty.
Setthegapto0.76mm(0.030inch).
B
A
g027479
Figure52
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