Technical￿training. Product￿information. B46￿Engine …

[Pages:150]Technicaltraining. Productinformation. B46Engine

BMW Service



Generalinformation

Symbolsused

Thefollowingsymbolisusedinthisdocumenttofacilitatebettercomprehensionortodrawattention toveryimportantinformation:

Containsimportantsafetyinformationandinformationthatneedstobeobservedstrictlyinorderto guaranteethesmoothoperationofthesystem.

Informationstatusandnational-marketversions

BMWGroupvehiclesmeettherequirementsofthehighestsafetyandqualitystandards.Changes inrequirementsforenvironmentalprotection,customerbenefitsanddesignrendernecessary continuousdevelopmentofsystemsandcomponents.Consequently,theremaybediscrepancies betweenthecontentsofthisdocumentandthevehiclesavailableinthetrainingcourse.

ThisdocumentbasicallyrelatestotheEuropeanversionofleft-handdrivevehicles.Someoperating elementsorcomponentsarearrangeddifferentlyinright-handdrivevehiclesthanshowninthe graphicsinthisdocument.Furtherdifferencesmayariseasaresultoftheequipmentspecificationin specificmarketsorcountries.

Additionalsourcesofinformation

Furtherinformationontheindividualtopicscanbefoundinthefollowing:

? Owner'sHandbook ? IntegratedServiceTechnicalApplication.

Contact:conceptinfo@bmw.de

?2014BMWAG,Munich

ReprintsofthispublicationoritspartsrequirethewrittenapprovalofBMWAG,Munich

Theinformationcontainedinthisdocumentformsanintegralpartofthetechnicaltrainingofthe BMWGroupandisintendedforthetrainerandparticipantsintheseminar.Refertothelatestrelevant informationsystemsoftheBMWGroupforanychanges/additionstothetechnicaldata.

Contact: SebastianRiedel Tel.:+49(0)8938265044 E-mail:sebastian.rs.riedel@bmw.de

Informationstatus:June2014 BV-72/TechnicalTraining

B46Engine Contents

1.

Introduction 1 .............................................................................................................................................................................................................................................

1.1.

Engine designation 1 .............................................................................................................................................................................................

1.2.

Engine identification 2 .........................................................................................................................................................................................

1.2.1.

4-cylinder engine 2 ..................................................................................................................................................................

1.3.

Highlights 3 ............................................................................................................................................................................................................................

1.3.1.

Installation positions 3 ........................................................................................................................................................

1.3.2.

Advantages 4 .....................................................................................................................................................................................

1.3.3.

Overviewoftechnicalfeatures 4 ........................................................................................................................

1.4.

Modular design 5 ..........................................................................................................................................................................................................

1.4.1.

TwinPower Turbo 7 ..................................................................................................................................................................

1.5.

Technical data 7 .............................................................................................................................................................................................................

1.5.1.

Model overview 8 ........................................................................................................................................................................

1.6.

Engine acoustics 8 ....................................................................................................................................................................................................

1.6.1.

Comparison 9 ....................................................................................................................................................................................

1.6.2.

Active Sound Design 12 .................................................................................................................................................

2.

Engine Mechanical 14 ................................................................................................................................................................................................................

2.1.

Engine housing 14 .....................................................................................................................................................................................................

2.1.1.

Cylinder head cover 15 .....................................................................................................................................................

2.1.2.

Cylinder head 22 .........................................................................................................................................................................

2.1.3.

Crankcase 24 .....................................................................................................................................................................................

2.1.4.

Oil sump 28 .........................................................................................................................................................................................

2.2.

Crankshaft drive 33 ...................................................................................................................................................................................................

2.2.1.

Crankshaft 33 ....................................................................................................................................................................................

2.2.2.

Connecting rod 40 ....................................................................................................................................................................

2.2.3.

Piston 43 ...................................................................................................................................................................................................

2.2.4.

Counterbalance shafts 45 .............................................................................................................................................

2.2.5.

CounterbalanceshaftofB46engine............................................................................................... 52

2.2.6.

Torsional vibration damper 55 ................................................................................................................................

2.2.7.

Chain drive 57 ..................................................................................................................................................................................

2.3.

Valve gear 60 .......................................................................................................................................................................................................................

2.3.1.

Variants 60 .............................................................................................................................................................................................

2.3.2.

VANOS 61 ..............................................................................................................................................................................................

2.3.3.

Valvetronic 67 ...................................................................................................................................................................................

2.4.

Belt drive 74 .........................................................................................................................................................................................................................

3.

Oil Supply 75 ...............................................................................................................................................................................................................................................

3.1.

Oil circuit 75 .........................................................................................................................................................................................................................

3.2.

Map control 77 .................................................................................................................................................................................................................

3.3.

Oil pump 78 ..........................................................................................................................................................................................................................

3.3.1.

Map control valve 81 .............................................................................................................................................................

B46Engine Contents

3.4. 3.5. 3.6.

3.3.2.

Normal operation 82 ..............................................................................................................................................................

3.3.3.

Emergency operation 83 ................................................................................................................................................

Suction pipe 84 ...............................................................................................................................................................................................................

Pressure-limiting valve 85 ..............................................................................................................................................................................

Oil filter module 86 ....................................................................................................................................................................................................

3.6.1.

Filter bypass valve 88 ..........................................................................................................................................................

3.6.2.

Heatexchangerbypassvalve 88 .......................................................................................................................

4.

Cooling System 89 ...........................................................................................................................................................................................................................

4.1.

Cooling circuit, B46 engine 89 ...............................................................................................................................................................

4.1.1.

Special features 90 ..................................................................................................................................................................

4.2.

System overview, vehicle 91 ......................................................................................................................................................................

4.3.

Cooling module 92 ....................................................................................................................................................................................................

4.4.

Coolant pump 93 ..........................................................................................................................................................................................................

4.5.

Expansion tank 94 ......................................................................................................................................................................................................

4.6.

Coolant 95 ...............................................................................................................................................................................................................................

5.

Intake Air and Exhaust System 96 .....................................................................................................................................................................

5.1.

Intake air system 97 .................................................................................................................................................................................................

5.1.1.

Intake silencer 98 .......................................................................................................................................................................

5.1.2.

Charge air cooling 99 ...........................................................................................................................................................

5.2.

Exhaust emission system 99 .....................................................................................................................................................................

5.2.1.

Exhaust turbocharger 99 ................................................................................................................................................

5.2.2.

Blow-off valve 100 ....................................................................................................................................................................

5.2.3.

Chargingpressurecontrol 100 .............................................................................................................................

5.2.4.

Exhaust system 104 ............................................................................................................................................................

6.

Vacuum Supply 109 .......................................................................................................................................................................................................................

6.1.

System overview 109 ............................................................................................................................................................................................

6.2.

Vacuum pump 110 .....................................................................................................................................................................................................

7.

Fuel System 112 ...................................................................................................................................................................................................................................

7.1.

Fuel pump control module 113 .............................................................................................................................................................

7.2.

Electric fuel pump 113 ........................................................................................................................................................................................

7.3.

Fuel preparation 115 ...............................................................................................................................................................................................

7.3.1.

Fuel high-pressure pump 116 ...............................................................................................................................

7.3.2.

Direct rail 119 ...................................................................................................................................................................................

7.3.3.

Solenoid valve injector 121 ........................................................................................................................................

8.

Engine Electrical System 129 .....................................................................................................................................................................................

8.1.

DigitalMotorElectronics(DME) 129 ............................................................................................................................................

B46Engine Contents

8.2. 8.3.

8.4.

Systemwiringdiagram,B46engine 130 ...............................................................................................................................

Map ignition 132 ...........................................................................................................................................................................................................

8.3.1.

Diagnostic functions 133 ...............................................................................................................................................

8.3.2.

Ignition coils 135 .........................................................................................................................................................................

8.3.3.

Spark plugs 138 ...........................................................................................................................................................................

Systemoverviewforengineelectricalsystem 138 ................................................................................................

8.4.1.

Transmission side 139 .......................................................................................................................................................

8.4.2.

Side view 140 ...................................................................................................................................................................................

8.4.3.

Belt side 141 ......................................................................................................................................................................................

B46Engine 1.Introduction

Thisdocumentdescribesthespecialfeaturesofthenew4-cylinderengineandservestosupport thetechnicalservice.Duetothehugesimilarities,betweentheB38TopengineandB46,thetwo enginesaredescribedinthisonedocument.Someimagesshownrelatetothe3-cylinderengine. Thedifferencescomparedtothe4-cylinderengineareshownanddescribedseparately.However,the similaritiesarenotrepeated.Theenginesaredistinguishedasfollowsinthisdocument:

? B38=3-cylinderengine ? B46=4-cylinderengine ? Bx8=3and4-cylinderengine

1.1.Enginedesignation

Inthetechnicaldocumentation,theenginedesignationisusedtoensureunambiguousidentification oftheengine.Frequently,onlyashortdesignationisused,whichisexplainedinthefollowingtable.

Position 1 2 3 4 5+6 7

8

Meaning Enginedeveloper Enginetype

Changetothebasic engineconcept Workingmethodorfuel andinstallationposition Displacementin 1/10 liter Performanceclasses

Revisionrelevantto approval

Index

B

3 4

6 8

A

15 20

K U M O T S

0 1 2

Explanation

BMWGroupengine

3-cylinderin-lineengine 4-cylinderin-lineengine

SULEV/Turbo-ValvetronicDirectInjection(TVDI) Turbo-ValvetronicDirectInjection(TVDI)

Gasolineengine,transversalinstallation

1.5 literdisplacement 2.0literdisplacement

Lowest Lower Middle Upper Top Super

Newdevelopment Firstrevision Secondrevision



1

B46Engine 1.Introduction

1.2.Engineidentification

The7-digitengineidentificationisonthecrankcase.Thefirstsixdigitsoftheengineidentification arederivedfromtheenginetype.Onlytheseventhdigitisdifferent.Theseventhdigitoftheengine identificationisthetestnumberofthetypeapprovalcertification.

Theconsecutiveenginenumberisembossedabovetheengineidentification.Usingthesetwo numberstheenginecanbeclearlyidentifiedbythemanufacturer.

1.2.1.4-cylinderengine

EngineidentificationforB46engine

Index 1 2

Explanation Enginenumber Engineidentification

2



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