Toro 74629 - Servicing the Spark Plug

ServicingtheSparkPlug
ServiceInterval:Every50hours—Checkthesparkplug.
Every100hours—Replacethesparkplug.
Ensurethattheairgapbetweenthecenterandsideelectrodes
iscorrectbeforeinstallingthesparkplug.Useasparkplug
wrenchforremovingandinstallingthesparkpluganda
gappingtoolorfeelergaugetocheckandadjusttheairgap.
Installanewsparkplugifnecessary.
Type:ChampionRC12YC,Autolite3924,NGKBCPR6ES
orequivalent
AirGap:0.76mm(0.03inch)
RemovingtheSparkPlug
1.Disengagetheblade-controlswitch(PTO).
2.Stoptheengine,waitforallmovingpartstostop,and
removethekeybeforeleavingtheoperatingposition.
3.Disconnectthewirefromthesparkplug(
Figure33).
G017865
1
Figure33
1.Spark-plugwire
4.Cleanaroundthesparkplugtopreventdirtfromfalling
intotheengineandpotentiallycausingdamage.
5.Removethesparkplugandmetalwasher.
CheckingtheSparkPlug
1.Inspectthesparkplug(Figure34).
Note:Ifyouseelightbrownorgrayontheinsulator,
theengineisoperatingproperly.Ablackcoatingonthe
insulatorusuallymeansthattheaircleanerisdirty.
Figure34
1.Centerelectrodeinsulator3.Airgap(nottoscale)
2.Sideelectrode
Important:Donotcleanthesparkplug.Always
replacethesparkplugwhenithasablackcoating,
wornelectrodes,anoilylm,orcracks.
2.Checkthegapbetweenthecenterandsideelectrodes
(Figure34).
Note:Bendthesideelectrodeifthegapisnotcorrect.
InstallingtheSparkPlug
1.Installthesparkplugandthemetalwasher.
Note:Ensurethattheairgapissetcorrectly.
2.Tightenthesparkplugto20N-m(15ft-lb).
3.Connectthewiretothesparkplug.
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