Toro 74385 - Cleaning the Blower Housing

G014537
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Figure34
1.Sparkplugandwirelocation
CheckingtheSparkPlug
1.Lookatthecenterofthesparkplug(Figure35).
Ifyouseelightbrownorgrayontheinsulator,the
engineisoperatingproperly.Ablackcoatingonthe
insulatorusuallymeanstheaircleanerisdirty.
Important:Nevercleanthesparkplug.Always
replacethesparkplugwhenithasablack
coating,wornelectrodes,anoilylm,orcracks.
2.Checkthegapbetweenthecenterandsideelectrodes
(
Figure35).Bendthesideelectrode(Figure35)if
thegapisnotcorrect.
Figure35
1.Centerelectrodeinsulator3.Airgap(nottoscale)
2.Sideelectrode
InstallingtheSparkPlug
1.Installthesparkplug.Makesurethattheairgapis
setcorrectly.
2.Tightenthesparkplugto30ft-lb(41N-m).
3.Pushthewireontothesparkplug(Figure34).
CleaningtheBlowerHousing
Toensurepropercooling,makesurethegrassscreen,
coolingns,andotherexternalsurfacesoftheengine
arekeptcleanatalltimes.
Annuallyorevery100hoursofoperation(moreoften
underextremelydusty,dirtyconditions),removethe
blowerhousingandanyothercoolingshrouds.Clean
thecoolingnsandexternalsurfacesasnecessary.Make
surethecoolingshroudsarereinstalled.Torquethe
blowerhousingscrewsto5.5ft-lb(7.5N-m).
Important:Operatingtheenginewithablocked
grassscreen,dirtyorpluggedcoolingns,and/or
coolingshroudsremoved,willcauseenginedamage
duetooverheating.
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