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NOTETheinformationcontainedinthistrainingcoursemanualisintendedsolelyforparticipantsoftheBMWServiceTrainingcourse.RefertotherelevantTechnicalServiceinformationforanychanges/supplementstotheTechnicalData.©2001BMWAGMünchen,Germany.ReprintsofthismanualoritspartsrequirethewrittenapprovalofBMWAG,MünchenVS-42MFP-HGK-BRK-N62_0300ContentsPageCHAP1Introduction1History1Future2TheValvetronicprinciple4IntroductionoftheN62engine6-Technicaldata7-Fullloadgraphs8-N62B36engineview10CHAP2Enginemechanics12Generalairintakesystem12Airducts13-Freshairsystem13-Throttlevalve14-Variableintakepipe15-Crankcaseventingsystem18Exhaustsystem19-Exhaustmanifoldwithcatalyticconverter20-Silencer20-Secondaryairsystem21Auxiliarycomponentsandbeltdrive22-Beltdrive22-Alternator23-Coolantcompressor26-Startermotor27-Powersteeringpump27Cylinderheads28-Introduction28-Cylinderheadcovers31-Valvegear33Bi-VANOS(variablecamshaftadjustment)35-VANOSfunction36-Timingdiagram39Valvetronic40-Descriptionofthefunction40-Valveliftadjustmentcomponents42-Valvetronicadjustmentdiagram45-Chaindrive46Coolingsystem50-Coolantcircuit50-Waterpump54-Map-controlledthermostat54-Coolingmodule55-Coolingradiator56-Coolantexpansiontank56-Transmissionoil-waterheatexchanger(ÖWT)57-Electricallyoperatedfans57-Viscouscouplingfan57Engineblock58-Oilsump58-Crankcase59-Crankshaft60-Connectingrodandpiston62-Flywheel63-Vibrationdamper63-Enginesuspension63Lubricationsystem64-Oilcircuit64-Oilpump66-Oilfilter67-Oilcooling67-Technicaldata68CHAP3N62enginemanagementsystemME9.269-Generalinformation69-Overview70-Functionaldescription73-Oxygensensorregulation74-Emissioncontrol75-Oillevel/condition77-Variableintakemanifold80-Valvetronic81-Idlespeedcontrol83CHAP4N62fuelsystem84Mixturecontrol84-Generalinformation84-Injectionvalves84-Fuelpressureregulator85-Electricfuelpump(EKP)85-EKPregulation86Tanksystem87-Generalinformation89-Fueltankleakdiagnosticmodule(DMTL)90N62NGengine-1-IntroductionHistoryThepetrolanddieselenginesusedtodayarehighlytechnicalassemblies.Withtheintroductionofandfurtherdevelopmentsindirectinjection,thedieselengineinparticularhasachievedperformancevalueswhichhadpreviouslyonlybeenachievedbyverygoodpetrolengines.Ithasalsobeenpossibletosignificantlyreducefuelconsumption.Inthepast,petrolengineswereabletoachieveverygoodtorqueandperformancelevels,anditwaspossibletoreducefuelconsumptionby10%.Inaddition,thelowestemissionsvalueswereachieved.Notethemeasuresintroducedinordertoachievetheseobjec-tives:Notes________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Nevertheless,inthemeantime,anoticeablegaphasdevelopedintermsoffuelconsumptionbetweenthepetrolengineandthedieselengine.Innovationssuchasdirectinjectionandthrottle-freeloadcontrolwithvariablevalvetrain,however,suggestsuchgreatpotentialforpetrolenginesthatthepetrolenginecanapproachthepart-loadfuelconsumptionvaluesofthedieselengine.N62NGengine-2-FutureThefollowingmarketandlegalrequirementsdriveourplansforthefuture:-Reducedfuelconsumption-Improvedperformance-Increasedcomfort-Reducedemissions-Improvedcost/benefitratioReferredtotheengine,improvementsinfuelconsumptionmeananincreaseinefficiency.Therearethreetechnicallyfeasibleoptionsforincreasingefficiency:-Increasingtheengine'sefficiencybyNotes____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________-ReducinglossescausedbyfrictionNotes____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________-AvoidingchargecyclelossesbyNotes____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________N62NGengine-3-Ofthesethreeoptions,avoidingchargecyclelossespresentsthegreatestpotentialforimprovementand,inprinciple,canbeusedonanythrottle-controlledengine.Throttle-freeloadcontroloffersthepotentialforareductioninfuelconsumptioncomparabletothatofthedirectinjectionpetrolengine,theoreticallywithoutanydiscernibleweakpoints.AtBMW,thevariablevalvetrain,inconjunctionwithDoubleVanos,isknownasValvetronic.TheValvetronicsystemfacilitatesimprovedconsumptionwithoutthedisadvantages