Toro DH 140 - Servicing the Spark Plug

6.Fillthecrankcasewiththepropertypeofnewengine
oil;refertoCheckingtheEngineOilLevel.
ServicingtheSparkPlug
ServiceInterval:Every25hours—Checkthesparkplug.
Every100hours—Replacethesparkplug.
UseaChampionRC12YCorequivalentsparkplug.
Ensurethattheairgapbetweenthecenterandsideelectrodes
is0.030inch(0.76mm)beforeinstallingthesparkplug.Use
asparkplugwrenchforremovingandinstallingthespark
plugandagappingtoolorfeelergaugetocheckandadjust
theairgap.
RemovingtheSparkPlug
1.Disengagetheblades(PTO).
2.Settheparkingbrake.
3.Stoptheengineandwaitforallmovingpartstostop.
4.Removetheignitionkey.
5.Openthehood.
6.Disconnectthewirefromthesparkplug(
Figure28).
G012457
1
2
3
Figure28
1.Sparkplug3.Frontofengine
2.Sparkplugwire
7.Cleanaroundthesparkplugtopreventdirtfromfalling
intotheengineandpotentiallycausingdamage.
8.Removethesparkplugandthemetalwasher
(Figure28).
CheckingtheSparkPlug
1.Lookatthecenterofthesparkplug(Figure29).Ifyou
seelightbrownorgrayontheinsulator,theengineis
operatingproperly.Ablackcoatingontheinsulator
usuallymeansthattheaircleanerisdirty.
Figure29
1.Centerelectrodeinsulator3.Airgap(nottoscale)
2.Sideelectrode
Important: Do not clean the spar k plug . Always
replacethesparkplugwhenithasablackcoating,
wornelectrodes,anoilylm,orcracks.
2.Checkthegapbetweenthecenterandsideelectrodes
(
Figure29)andbendthesideelectrodeifthegapis
notcorrect.
InstallingtheSparkPlug
1.Installthesparkplugandmetalwasher.Ensurethat
theairgapissetcorrectly.
2.Tightenthesparkplugto15ft-lb(20.4N-m).
3.Connectthewiretothesparkplug(Figure28).
4.Closethehood.
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