64l cooling system
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Cooling System Features
Thecoolantpumpcanbeservicedwithoutdisconnectingradiatorhoses.
Boththeglowplugsleevesandtheinjectorsleevesarestainlesssteel.
Cooling System Features
CoolantPump
StainlessSteelInjectorSleeves
StainlessSteelGlowPlugSleeves
Internal Coolant Flow
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EGR Cooler #1
Radiator
Degas
Bottle
HeaterCore
E
GRCooler#2
Coolant feed
to EGR valve
Hot coolantfrom pump to
top radiator port
Cooled coolant
to pump frombottom radiator port
Radiator fill/
Overflow supply
to degas bottle
(flow in either direction)
Coolant Pump
Color change indicates
coolant temperature
as heat is transfered
from exhaust gases
to the coolantHot exhaust
in from right
up-pipe
Partially cooled
exhaust gases
Cooled exhaust
out to EGR valve
HotCoolant
Cooled Coolant
Deaeration/coolant feed
to degas bottle
Cooling System Flow: External Flow
Coolantisdrawnintotheinletotherontcoverromthebottomradiatorportandthenowsromthecoolantpumpthroughtherontcovertothecrankcase.
Coolantisalsoroutedromtherontcoverintothecrankcasetoapassagethateedstheoilcooler(shownonnextpage).
CoolantisroutedromtherontcovertotheEGRcoolers,EGRvalve,
degasbottle,andthevehicleheatercore. ThehorizontalEGRcoolerreceivescoolantfrst,thenthecoolant
travelstotheverticalEGRcoolerthroughashortconnectionhose.HotcoolantexitstheverticalEGRcooleratthetopandentersintotherontcover.
AportnexttothehotEGRreturnportintherontcoverrouteshotcoolanttotheheatercoreorvehicleheating.ThecoolantthentravelstoaY-pipewhereitmeetswithdegasreturncoolantbeorebeingsentintotherontcover,justabovethemaincoolantinletromtheradiotor.
External Coolant Flow
TheEGRvalvereceivesitscoolantromapassageatthetopotheverticalEGRcooler.OncethecoolantexitstheEGRvalveitissenttothedegasbottle(thispassageisthehighestpointinthesystemandisalsothedeaerationport).
TheportdirectlybelowtheEGRvalvereturn/deaerationportonthedegasbottleisusedasaradiatorfll/overowlineconnectingwiththetopotheradiator.
Adualthermostatsytemisusedtocontroltheoworeturncoolanttotheradiator.Ithethermostatsareopen,coolantowstotheradiatortobecooled.Thebottomthermostathasabypasscircuitthatwillallowcoolanttoreturntothepumpwhenthethermostatsareclosed(speedingenginewarmup).
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Cooling System Flow: Oil Cooler
Coolantisdirectedoutothecrankcaseandintotheoilflterbaseattherontotheengine.
Theoilflterbaseroutesthecoolantdownintotherontotheoilcoolerthentowardtherearotheengine.
Oncethecoolanthaspassedthroughtheoilcooleritisrouteduptothetopotheoilcoolerthendirectedtowardstherontthroughaportwhereitisthenrouteddown,outothecooler,throughaportintheblock.
Coolant
Inlet from
Crankcase
Inlet to
Cooler
Coolant
Outlet to
Crankcase
Outlet
from Cooler
Oil Cooler Cover(Top View)
Oil Cooler Cover
(Bottom View)
Oil Cooler Cover
Oil Filter Base
Oil Cooler
Oil Cooler Coolant Flow
Cooling System Flow: Back of Front Cover
Coolantissealedviaametalonepiecegasketandisdirectedoutotherontcoverthroughthree(3)passages.
Twoothepassagesroutecoolanttothecrankcasetocoolthecylinderwallsandcylinderheads(therearedierentsizedorifcespressedintothecrankcaseinthesetwopassages).
Thethirdpassageroutescoolanttotheoilcoolerviaa
passageinthecrankcase. Therearetwopassagesorcoolanttoreturnromthe
crankcaseintotherontcover.
COOLANT IN
(from block)
COOLANT OUT
(to block)
Coolant
Orifices
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Cooling System Flow: EGR Coolers
Cooledcoolantowsoutothesupplyportotherontcoverwhereitisroutedtothehorizontalcoolerattheletrearsideotheengine.
Thecoolantthenexitsthehorizontalcoolerandisimmediatelyroutedintotheverticalcooler.Thecoolantthenexitstheverticalcoolerwhereitisroutedtothereturnportintherontcover.
ThereisasmallportatthetopotheverticalcoolerwherecoolantisallowedtoowtotheEGRvalve,coolthevalve,thenthecoolantisroutedtothedegasbottle.Thisportisalsousedasthedeaerationport.
CoolantowsthroughtheEGRcoolersandremovesheatromtheexhaustbeoretheexhaustarrivesattheEGRvalve.
Coolant Pump & Front Cover
Thecoolantpump,(hubandimpeller)ismountedintotherontcoverwhichisthehousingorthewaterpump.
Thecoolantpumpimpellerpullscoolantromthecenterothehousingandpushesitoutward.
Thecoolantpumphasabuiltinreservoirtocatchsmallamountsocoolantthatduringnormaloperationotheenginemayseeppasttheseal.Thiscoolantwillevaporateovertime.
Note:Thecoolantpumpimpellermaybedamagedifdroppedorhitbyahardobject.
Injector Sleeve
The6.4LPowerStrokeusesstainlesssteelinjectorsleevestosealcoolantromtheinjectorandtotranserheatromtheinjectortothecoolant.
Theinjectorsleeveisreplaceable.
EGR Cooler Horizontal
Coolant Supply
EGR Cooler Vertical
Coolant Supply
from Horizontal
Outlet
EGR Cooler
Vertical
Coolant
Outlet/Return
to Front Cover
EGR Valve Coolant
Supply
Injector Sleeve
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Glow Plug Sleeve
Glowplugsleevesareusedtokeepcoolantromcomingindirectcontactwiththeglowplugsandtosealcoolantromthecombustionchamber.
Theglowplugsleeveisreplaceable.Seeuniqueserviceproceduresortheservicemanualormoredetails.
Degas Bottle
Thedegasbottleislocatedontheletsideotheenginecompartmentandispartotheletsidebatterytray.
OneotheportsonthebottleisattachedtotheEGRvalvecoolantline(whichissuppliedromthetopotheverticalEGRcooler).Ithisportorhoseisblocked,damagecouldoccurtotheEGRcoolersand/ortheEGRvalve.
Glow Plug Sleeve