Toro 74389 - Cleaning the Cooling System; Cleaning the Blower Housing

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Figure36
1.Sparkplugandwirelocation
CheckingtheSparkPlug
Important:Donotcleanthesparkplug(s).Always
replacethesparkplug(s)whenithas:ablackcoating,
wornelectrodes,anoilylm,orcracks.
Ifyouseelightbrownorgrayontheinsulator,theengineis
operatingproperly.Ablackcoatingontheinsulatorusually
meanstheaircleanerisdirty.
Setthegapto0.76mm(0.030inch).
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Figure37
InstallingtheSparkPlug
Tightenthesparkplug(s)to22N-m(16ft-lb).
16ft-lb
22N-m
G010687
Figure38
CleaningtheCoolingSystem
Cleantheair-intakescreenfromgrassanddebrisbeforeeach
use.
1.Disengagetheblade-controlswitch,movethecontrol
leverstotheneutral-lockedposition,andapplythe
parkingbrake.
2.Stoptheengine,removethekey,andwaitforallmoving
partstostopbeforeleavingtheoperatingposition.
3.Removetheair-intakescreen,theair-cleanercover,and
thefanhousing.
4.Cleandebrisandgrassfromtheparts.
5.Installtheair-intakescreen,air-cleanercover,andthe
fanhousing.
CleaningtheBlowerHousing
Toensurepropercooling,makesurethegrassscreen,cooling
ns,andotherexternalsurfacesoftheenginearekeptclean
atalltimes.
Annually,orevery100hoursofoperation(moreoften
underextremelydusty,dirtyconditions),removetheblower
housing,andanyothercoolingshrouds.Cleanthecooling
nsandexternalsurfacesasnecessary.Makesurethecooling
shroudsareinstalled.Torquetheblowerhousingscrewsto
7.5N-m(5.5ft-lb).
Important:Operatingtheenginewithablockedgrass
screen,dirtyorpluggedcoolingns,and/orcooling
shroudsremoved,willcauseenginedamagedueto
overheating.
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