Craftsman 247.887821 - Page 16

Measurethepluggapwith afeelergauge.Correctasnecessarybybending
thesideelectrode,seeFigure19.Thegapshouldbesetto .02-.03inches
(0.60-0.80mm).
Electrode
.02-.03in.
(0.60-0.80ram)
Figure19
4. Checkthatthesparkplugwasherisin goodconditionandthreadthespark
plugin byhandtopreventcross-threading.
5. Afterthesparkplugisseated,tightenwith asparkplugwrenchtocompress
thewasher.
NOTE:Wheninstallinganewsparkplug,tighten1/2-turnafterthespark
plugseatsto compressthewasher.Whenreinstallingausedsparkplug,
tighten1/8-to 1/4-turnafterthesparkplugseatstocompressthewasher.
Thesparkplug mustbetightened securely.Aloosesparkplugcanbecome
veryhot and candamagetheengine.
Cleaningthe Engine
Iftheenginehasbeenrunning,allowittocoolforatleasthalfanhourbeforecleaning.
Periodicallyremovedirtbuild-upfromengine.Beforeservicingtheengine,removethe
carburetorcoverand/orblowerhousing.Cleandirtanddebrisfromthefollowingareas:
Donot spraythe enginewith waterto cleanitbecausethewater could
contaminatethe fuel. Usinga gardenhoseorpressurewashingequipment
canalsoforce water intothe muffler opening. Waterthat passesthrough
the muffler canenterthe cylinderandcausedamage.
CoolingFins
AirIntakeScreenor RecoilStarter/FlywheelGuardAreas
SparkPlugConnection
Levers
LinkageArea
Guards
Carburetor
EngineHead
Removingdebriswillinsureadequatecooling,correctenginespeedandreducethe
riskoffire.
Donotspraytheenginewith water to cleanit becausethe water could
contaminatethe fuel. Usinga gardenhoseor pressurewashingequipment
canalsoforcewater into the muffler opening.Waterthat passesthrough
the muffler canenter theenginecylinder andcausedamage.
Accumulationofdebrisaroundthe muffler couldcauseafire. Inspectand
cleanbeforeeveryuse.
Lubrication
Lubricatethepivotpointsonthecontrolhandleandtheextensionspringat theend
ofthecontrolcablewith a lightoilonceeveryseasonandbeforethesnowthrower
isputintostorageattheendoftheseason.
Adjustments
ShavePlate
Tochecktheadjustmentoftheshaveplate,placethemachineonalevelsurface.
Thewheels,shaveplateandaugerpaddlesshouldallcontactthelevelsurface.
Notethatif theshaveplateisadjustedtoohigh,snowmayblowundertheauger
housing.Iftheshaveplatewearsoutexcessively,orthesnowthrowerdoesnot
self-propel,theshaveplatemaybetoolowthegroundandneedsto beadjusted.
NOTE:Onnewsnowthrowersormachineswith anewshaveplateinstalled,
theaugerpaddlesmaybeslightlyofftheground.
Toadjusttheshaveplateproceedasfollows:
1. Runthesnowthroweruntilthefueltankisempty.
2. Pullthestartercorduntilresistanceisfelt.Thentipthesnowthrowerbackuntilit
restsonthehandles.Toensurethatthesnowthrowerdoesnottip forward,it may
benecessarytosecurethehandletothegroundwithablockorotherobject.
3. Loosenthefourflangelocknutsandcarriagescrewswhichsecuretheshaveplate
tothehousing.SeeFigure20.Movetheshaveplatetotheappropriatepositionand
retightenthenutsandscrewssecurely.
16
ReversibleShavePlate
Figure20
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