Checking Spark Plug - Craftsman 247.883951 Operator's Manual

Refillwith the recommended o il andcheck the oil level. S eeRecommended
OilUsage chart.Theengine's oil capacityis37ounces.
(oF)-40o-20 o 0o 200 400
(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.
Thoroughly w ashyourhands with soapandwater assoonaspossibleafter
handling usedoil.
Checking SparkPlug
DO NOT checkfor sparkwith sparkplug removed.DONOT crankenginewith
sparkplug removed.
Ifthe engine hasbeenrunning, t he muffler will bevery hot. Becarefulnot
to touchthe muffler.
NOTE: C heck t he sparkplugonceaseason o r 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 21.
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 22.Thegapshouldbesetto .02-.03 inches (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.
Oil Drain
Plug \
Figure20
E
SparkPlug
Spark Plug Boot
Figure21
Electrode
Thesparkplug mustbe tightened securely.Aloosesparkplug can become
very hot andcan damagethe engine.
19
Figure22