Checking Sparkplug - Craftsman 247.889720 Operator's Manual

Refillwith the recommended o il andcheck the oil level.SeeRecommended
OilUsage chart.Theengine's oil capacityis20ounces.
(oF)-40o-20 o 0o 20o 40o
(oc) -30° -20° -10 ° 0°
DO NOT use nondetergentoil or 2-strokeengine oil. it couldshorten the
engine'sservicelife.
7. Reinstall the oil filler cap/dipstick securely.
Thoroughlywashyour hands with soapandwater assoonaspossibleafter
handlingusedoil.
Checking SparkPlug
Washer
OilDrain
PLug
Figure19
SparkPlug Boot
DO NOT checkfor sparkwith sparkplug removed.DONOT crankenginewith
sparkplug removed.
Ifthe engine hasbeenrunning, the muffler will bevery hot. Becarefulnot
to touchthe muffler.
NOTE: C heck t he sparkplugonceaseason or every25 hours of operation. C hange
the sparkplugonceaseason or every100hours.Toensure properengineoperation,
the sparkplug mustbeproperlygapped andfreeof deposits.
1. Remove t he sparkplugbootandusea sparkplugwrenchto remove the
plug.SeeFigure 20.
2. Visually inspectthe sparkplug.Discard the sparkplugif thereisapparent
wear, o r if the insulatoriscracked or chipped.Clean the sparkplugwith a
wirebrushif it isto be reused.
3.
Measure the pluggapwith afeelergauge. C orrect asnecessary b ybending
sideelectrode. S eeFigure 21.Thegapshouldbesetto .02-.03inches (0.60-
0.80mm).
4. Check thatthe sparkplug washer isin goodconditionandthreadthe spark
plug inbyhandto preventcross-threading.
5. Afterthe sparkplug isseated, t ightenwith asparkplugwrenchto compress
the washer.
NOTE: Wheninstallinganewsparkplug,tighten 1/2-turnafterthe sparkplug
seats to compress t he washer. W henreinstalling a usedsparkplug,tighten 1/8- to
1/4-turnafter the sparkplugseats to compress t hewasher.
Figure20
Electrode
Thesparkplug mustbe tightened securely.Aloosesparkplug can become
very hot and candamagethe engine.
19
Figure21