Operator's Manual

CheckingtheSparkPlug
Note:Useagappingtool/feelergaugetocheckandadjust
thegap.Installanewsparkplugifnecessary.
1.Lookatthecenterofthesparkplug(Figure50).Ifyou
seelightbrownorgrayontheinsulator,theengineis
operatingproperly.
Important:Donotcleanthesparkplug.Always
replacethesparkplugwhenithasablackcoating,
wornelectrodes,anoilylm,orcracks.
G019300
1 2
4
3
Figure50
1.Sideelectrode
3.Insulator
2.Centerelectrode4.0.7to0.8mm(0.028to
0.031inch)gap
2.Useagappingtoolforsparkplugsorafeelergaugeto
measurethegapbetweenthesideelectrodeandcenter
electrode(Figure50).
3.Ifthegapisnotwithinthespeciedrange,dothe
following:
A.Ifthegapistoosmall,carefullybendtheside
electrodeawayfromthecenterelectrodeuntil
thegapbetweentheelectrodesis0.7to0.8mm
(0.028to0.031inch).
B.Ifthegapistoolarge,carefullybendtheside
electrodetowardthecenterelectrodeuntilthe
gapbetweentheelectrodesis0.7to0.8mm(0.028
to0.031inch).
InstallingtheSparkPlug
Important:Ensurethatthegapbetweentheside
electrodeandthecenterelectrodeiscorrectbefore
installingthesparkplug.
1.Threadthesparkplugclockwiseintothespark-plug
holebyhand.
Note:Avoidcross-threadingthesparkplugwiththe
threadsofthespark-plughole.
2.Rotatethesparkplugclockwiseusinga20mm(13/16
inch)spark-plugwrenchuntiltheplugandsealing
washerareseated(Figure49).
3.Tightenthesparkplugasfollows:
•Wheninstallinganin-servicesparkplug,tighten
thepluganadditional1/8to1/4turn.
•Wheninstallinganewsparkplug,tightentheplug
anadditional1/2turn.
4.Pushthespark-plugwireontotheterminalofthespark
plug(Figure48).
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