The 6.4L Engine - Cooling System (5 Mb) · PDF file18 Cooling system 27 Cooling System Flow:...
Transcript of The 6.4L Engine - Cooling System (5 Mb) · PDF file18 Cooling system 27 Cooling System Flow:...
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Cooling System Features• Thecoolantpumpcanbeservicedwithoutdisconnecting
radiatorhoses.
• Boththeglowplugsleevesandtheinjectorsleevesarestainlesssteel.
Cooling System Features
•CoolantPump
•StainlessSteelInjectorSleeves
•StainlessSteelGlowPlugSleeves
Internal Coolant Flow
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EGR Cooler #1
Radiator
DegasBottle
Heater Core
EGR Cooler #2
Coolant feedto EGR valve
Hot coolantfrom pump to top radiator port
Cooled coolantto pump frombottom radiator port
Radiator fill/ Overflow supplyto degas bottle (flow in either direction)
Coolant Pump
Color change indicatescoolant temperatureas heat is transferedfrom exhaust gasesto the coolant
Hot exhaust in from rightup-pipe
Partially cooledexhaust gases
Cooled exhaustout to EGR valve
Ho
t C
oo
lan
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Cooled Coolant
Deaeration/coolant feedto degas bottle
Cooling System Flow: External Flow• Coolantisdrawnintotheinletofthefrontcoverfromthebottom
radiatorportandthenflowsfromthecoolantpumpthroughthefrontcovertothecrankcase.
• Coolantisalsoroutedfromthefrontcoverintothecrankcasetoapassagethatfeedstheoilcooler(shownonnextpage).
• CoolantisroutedfromthefrontcovertotheEGRcoolers,EGRvalve,degasbottle,andthevehicleheatercore.
• ThehorizontalEGRcoolerreceivescoolantfirst,thenthecoolanttravelstotheverticalEGRcoolerthroughashortconnectionhose.HotcoolantexitstheverticalEGRcooleratthetopandentersintothefrontcover.
• AportnexttothehotEGRreturnportinthefrontcoverrouteshotcoolanttotheheatercoreforvehicleheating.ThecoolantthentravelstoaY-pipewhereitmeetswithdegasreturncoolantbeforebeingsentintothefrontcover,justabovethemaincoolantinletfromtheradiotor.
External Coolant Flow
• TheEGRvalvereceivesitscoolantfromapassageatthetopoftheverticalEGRcooler.OncethecoolantexitstheEGRvalveitissenttothedegasbottle(thispassageisthehighestpointinthesystemandisalsothedeaerationport).
• TheportdirectlybelowtheEGRvalvereturn/deaerationportonthedegasbottleisusedasaradiatorfill/overflowlineconnectingwiththetopoftheradiator.
• Adualthermostatsytemisusedtocontroltheflowofreturncoolanttotheradiator.Ifthethermostatsareopen,coolantflowstotheradiatortobecooled.Thebottomthermostathasabypasscircuitthatwillallowcoolanttoreturntothepumpwhenthethermostatsareclosed(speedingenginewarmup).
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Cooling System Flow: Oil Cooler• Coolantisdirectedoutofthecrankcaseandintotheoilfilterbaseat
thefrontoftheengine.
• Theoilfilterbaseroutesthecoolantdownintothefrontoftheoilcoolerthentowardtherearoftheengine.
• Oncethecoolanthaspassedthroughtheoilcooleritisrouteduptothetopoftheoilcoolerthendirectedtowardsthefrontthroughaportwhereitisthenrouteddown,outofthecooler,throughaportintheblock.
Coolant Inlet from Crankcase
Inlet toCooler
Coolant Outlet to Crankcase
Outletfrom 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• Coolantissealedviaametalonepiecegasketandis
directedoutofthefrontcoverthroughthree(3)passages.
• Twoofthepassagesroutecoolanttothecrankcasetocoolthecylinderwallsandcylinderheads(therearedifferentsizedorificespressedintothecrankcaseinthesetwopassages).
• Thethirdpassageroutescoolanttotheoilcoolerviaapassageinthecrankcase.
• Therearetwopassagesforcoolanttoreturnfromthecrankcaseintothefrontcover.
COOLANT IN(from block)
COOLANT OUT(to block)
Coolant Orifices
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Cooling System Flow: EGR Coolers• Cooledcoolantflowsoutofthesupplyportofthefront
coverwhereitisroutedtothehorizontalcoolerattheleftrearsideoftheengine.
• Thecoolantthenexitsthehorizontalcoolerandisimmediatelyroutedintotheverticalcooler.Thecoolantthenexitstheverticalcoolerwhereitisroutedtothereturnportinthefrontcover.
• ThereisasmallportatthetopoftheverticalcoolerwherecoolantisallowedtoflowtotheEGRvalve,coolthevalve,thenthecoolantisroutedtothedegasbottle.Thisportisalsousedasthedeaerationport.
• CoolantflowsthroughtheEGRcoolersandremovesheatfromtheexhaustbeforetheexhaustarrivesattheEGRvalve.
Coolant Pump & Front Cover• Thecoolantpump,(hubandimpeller)ismountedintothe
frontcoverwhichisthehousingforthewaterpump.
• Thecoolantpumpimpellerpullscoolantfromthecenterofthehousingandpushesitoutward.
• Thecoolantpumphasabuiltinreservoirtocatchsmallamountsofcoolantthatduringnormaloperationoftheenginemayseeppasttheseal.Thiscoolantwillevaporateovertime.
Note:Thecoolantpumpimpellermaybedamagedifdroppedorhitbyahardobject.
Injector Sleeve• The6.4LPowerStrokeusesstainlesssteelinjectorsleeves
tosealcoolantfromtheinjectorandtotransferheatfromtheinjectortothecoolant.
• Theinjectorsleeveisreplaceable.
EGR Cooler Horizontal Coolant Supply
EGR Cooler Vertical Coolant Supplyfrom Horizontal Outlet
EGR Cooler Vertical CoolantOutlet/Returnto Front Cover
EGR Valve CoolantSupply
Injector Sleeve
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Glow Plug Sleeve• Glowplugsleevesareusedtokeepcoolantfromcomingin
directcontactwiththeglowplugsandtosealcoolantfromthecombustionchamber.
• Theglowplugsleeveisreplaceable.Seeuniqueserviceproceduresortheservicemanualformoredetails.
Degas Bottle • Thedegasbottleislocatedontheleftsideoftheengine
compartmentandispartoftheleftsidebatterytray.
• OneoftheportsonthebottleisattachedtotheEGRvalvecoolantline(whichissuppliedfromthetopoftheverticalEGRcooler).Ifthisportorhoseisblocked,damagecouldoccurtotheEGRcoolersand/ortheEGRvalve.
Glow Plug Sleeve