Checking Spark Plug - Craftsman 247.881721 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
DO NOT checkfor sparkwith sparkplug removed.DONOT crankenginewith
sparkplug removed.
Ifthe engine hasbeenrunning, t he muffler will bevery hot. Becarefulnot
to touchthe muffler.
NOTE: Check thespark p lug once aseason or every 2 5hours o foperation. Change
thespark p lug once aseason orevery 100 hours. Toensure p roper engine operation,
thespark p lugmust b eproperly g apped a nd freeofdeposits.
1. Remove thespark plug bootand use a spark p lug wrench toremove t he
plug. S ee Figure 14.
2. Visually inspect thespark plug. D iscard thespark plug ifthere isapparent
wear, orif theinsulator iscracked orchipped. Clean t hespark plug witha
wirebrush ifit istobereused.
3.
Measure the pluggapwith afeelergauge. C orrect asnecessary b ybending
sideelectrode. S eeFigure 15.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.
Oil Drain
Plug \
Figure13
E
SparkPlug
Spark Plug Boot
Figure14
Thesparkplug mustbe tightened securely.Aloosesparkplug can become
very hot andcan damagethe engine.
17
Figure15