Exmark Quest 4500-450 - Cleaning the Blower Housing

Maintenance
Asstatedinthemaintenanceintervals,removethe
sparkplug,checkcondition,andresetthegapor
replacewithanewplugasnecessary.
ThesparkplugisRFIcompliant.Equivalentalternate
brandplugscanalsobeused.
Type:ChampionXC92YC
ChampionRC12YCorQC12Cmaybeusedifyour
areadoesnotrequirecompliancewithCanadian
ICES-002,ISO14982,orEN55012.
AirGap:0.030inch(0.76mm)
RemovingtheSparkPlug
1.Disengagethebladecontrolswitch,movethe
motioncontrolsoutwardtotheparkposition,
stoptheengine,andremovethekey.
2.Pullthewireoffofthesparkplug(Figure25).
Cleanaroundthesparkplugtopreventdirtfrom
fallingintotheengineandpotentiallycausing
damage.
Note:Duetothedeeprecessaroundthespark
plug,blowingoutthecavitywithcompressedair
isusuallythemosteffectivemethodforcleaning.
Thesparkplugismostaccessiblewhenthe
blowerhousingisremovedforcleaning.
3.Removethesparkplugandmetalwasher.
Figure25
1.Sparkplugandwirelocation
CheckingtheSparkPlug
1.Lookatthecenterofthesparkplug(Figure26).
Ifyouseelightbrownorgrayontheinsulator,the
engineisoperatingproperly.Ablackcoatingon
theinsulatorusuallymeanstheaircleanerisdirty.
Important:Nevercleanthesparkplug.
Alwaysreplacethesparkplugwhenithasa
blackcoating,wornelectrodes,anoilylm,
orcracks.
2.Checkthegapbetweenthecenterandside
electrodes(Figure26).Bendthesideelectrodeif
thegapisnotcorrect.
Figure26
1.Sideelectrode3.Airgap(nottoscale)
2.Centerelectrode
insulator
InstallingtheSparkPlug
1.Installthesparkplug.Makesurethattheairgap
issetcorrectly.
2.Tightenthesparkplugto15ft-lb(20N-m).
3.Pushthewireontothesparkplug(Figure25).
CleaningtheBlowerHousing
ServiceInterval:Every100hours/Yearly
(whichevercomesrst)
Moreoftenunderdirty
conditions.
Toensurepropercooling,makesurethegrassscreen,
coolingns,andotherexternalsurfacesoftheengine
arekeptcleanatalltimes.
1.Removetheblowerhousingandanyothercooling
shrouds.
2.Cleanthecoolingnsandexternalsurfacesas
necessary.
3.Makesurethecoolingshroudsarereinstalled
Important:Operatingtheenginewithablocked
grassscreen,dirtyorpluggedcoolingns,
and/orcoolingshroudsremoved,willcause
enginedamageduetooverheating.
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