Toro 74621 - Engine Maintenance: Spark Plug; Checking and Installing Spark Plug

G017865
1
Figure32
1.Spark-plugwire
4.Cleanaroundthesparkplugtopreventdirtfrom
fallingintotheengineandpotentiallycausing
damage.
5.Removethesparkplugandmetalwasher.
CheckingtheSparkPlug
1.Inspectthesparkplug(Figure33).
Note:Ifyouseelightbrownorgrayonthe
insulator,theengineisoperatingproperly.Ablack
coatingontheinsulatorusuallymeansthattheair
cleanerisdirty.
Figure33
1.Centerelectrodeinsulator3.Airgap(nottoscale)
2.Sideelectrode
Important:Donotcleanthesparkplug.Always
replacethesparkplugwhenithasablack
coating,wornelectrodes,anoilylm,orcracks.
2.Checkthegapbetweenthecenterandsideelectrodes
(Figure33).Bendthesideelectrodeifthegapisnot
correct.
InstallingtheSparkPlug
1.Installthesparkplugandmetalwasher.
Note:Ensurethattheairgapissetcorrectly.
2.Tightenthesparkplugto15ft-lb(20N-m).
3.Connectthewiretothesparkplug.
28