94ENGINECOMPONENTANDLOCATION
Lubricantbecomesamistinmanyareasoftheengineastheresultofthemotionof
theparts(e.g.,rockerarms,pistons,crankshaft,camshaftandrockershaft).Themist
ridesthedraftsofairandothergasesthatcirculateintheopenspacesintheengine.
Topreventpressurebuildup,theopenspacesareductedthroughapipethatopensto
theatmospherenearthebottomoftheengine.
Thecrankcaseventilation(CCV)systemseparatestheoilymistfromthegases
bycentrifugalforce.Theoilreturnstotheoilpan.Theremainderescapestothe
atmosphere.
AturbineintheCCVseparator,drivenbyasmallstreamofoilstrikingitsns,spins
athighspeed.Themixtureofgasesandoilymisttrappedinthevalvecoverand
thetiminggearcoverdrainsontothetopofthecenteroftheturbineandrunsdown
ontoseveraldiscsrotatingwiththeturbine.Separationoccursasthemixture,ung
outwardbytheturbine,strikesthewallsoftheCCV .Thedropletsofmistcoalesce
intoaliquidanddrainbackintotheoilpanalongwiththeoilthatdrivestheturbine.
Thegasesarefreetoleaveviaanopenport.
Theopenportconnectstoatubeleadingtothebottomoftheenginewhereroad
draftdrawsthegasesintotheatmosphere.
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