Toro 74390 - Cleaning the Cooling System

Figure35
Note:Duetothedeeprecessaroundthesparkplug,
blowingoutthecavitywithcompressedairisusually
themosteffectivemethodforcleaning.Thesparkplug
ismostaccessiblewhentheblowerhousingisremoved
forcleaning.
CheckingtheSparkPlug
Important:Nevercleanthesparkplug(s).Always
replacethesparkplug(s)whenithas:ablackcoating,
wornelectrodes,anoilylm,orcracks.
Ifyouseelightbrownorgrayontheinsulator,theengineis
operatingproperly.Ablackcoatingontheinsulatorusually
meanstheaircleanerisdirty.
Setthegapto0.030inches(0.76mm).
G008794
1
2
Figure36
InstallingtheSparkPlug
Tightenthesparkplug(s)to16ft-lb(22N-m).
16ft-lb
22N-m
G010687
Figure37
CleaningtheCoolingSystem
Cleantheairintakescreenfromgrassanddebrisbeforeeach
use.
1.Disengagethebladecontrolswitchandmovethe
controlleverstotheneutrallockedpositionandapply
theparkingbrake.
2.Stoptheengine,removethekey,andwaitforallmoving
partstostopbeforeleavingtheoperatingposition.
3.Removetheairintakescreen,aircleanercover,and
fanhousing.
4.Cleandebrisandgrassfromtheparts.
5.Installtheairintakescreen,aircleanercover,andfan
housing.
30