Toro 4573 - Page 25

3.Stoptheengineandwaitforallmovingpartstostop.
4.Removetheignitionkey.
5.Openthehood.
6.Disconnectthewirefromthesparkplug(Figure24).
Figure24
1.Sparkplug2.Sparkplugwire
7.Cleanaroundthesparkplugtopreventdirtfrom
fallingintotheengineandpotentiallycausing
damage.
8.Removethesparkplugandthemetalwasher
(Figure24).
CheckingtheSparkPlug
1.Lookatthecenterofthesparkplug(Figure25).
Ifyouseelightbrownorgrayontheinsulator,the
engineisoperatingproperly.Ablackcoatingonthe
insulatorusuallymeansthattheaircleanerisdirty.
Figure25
1.Centerelectrodeinsulator3.Airgap(nottoscale)
2.Sideelectrode
Important: Do not clean the spar k plug . Always
replacethesparkplugwhenithasablack
coating,wornelectrodes,anoilylm,orcracks.
2.Checkthegapbetweenthecenterandsideelectrodes
(Figure25)andbendthesideelectrodeifthegap
isnotcorrect.
InstallingtheSparkPlug
1.Installthesparkplugandmetalwasher.Ensurethat
theairgapissetcorrectly.
2.Tightenthesparkplugto15ft-lb(20.4N-m).
3.Connectthewiretothesparkplug(Figure24).
4.Closethehood.
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