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Содержание B46B20O1

Страница 1: ...t t ob e r e s o l d b a r t e r e d c o p i e do r t r a n s f e r r e d w i t h o u t t h e e x p r e s s w r i t t e nc o n s e n t o f B MW o f N o r t hA me r i c a L L C B MW N A C o p y r i g h...

Страница 2: ...Technical training Product information BMW Service B46TU B48TU Engines...

Страница 3: ...hnical Training Centers or BMW Group Contract Training Facilities This training manual or any attached publication is not intended to be a complete and all inclusive source for repair and maintenance...

Страница 4: ...e 10 2 3 Valve gear 14 2 3 1 VANOS 14 2 4 Belt drive 15 3 Cooling System 17 3 1 Split cooling 17 3 2 Heat management module 20 3 3 Operating strategy 21 3 3 1 Cold start phase 22 3 3 2 Warm up phase 2...

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Страница 6: ...w G20 3 Series and G29 Z4 Roadster in early 2019 The B48TU engine will be available starting in November 2018 exclusively in the F39 X2 M35i 1 1 Innovations B46TU To meet the legal requirements for em...

Страница 7: ...possible to reduce the CO2 emissions by 2 5 5 while increasing engine performance by 5 kW 20 Nm 8 hp 15 lb ft 1 2 Innovations B48TU The technical improvements made to the B48TU engine a highlighted b...

Страница 8: ...B46TU B48TU Engines 1 Introduction 3 1 3 Engine identification 1 3 1 B46TU engine Engine identification transverse mounted shown...

Страница 9: ...seventh digit is different The seventh digit of the engine identification code is the test number of the type approval certification The 4th digit in the engine identification shown above is an A thi...

Страница 10: ...m 400 295 1550 4400 450 332 1750 4500 Number of cylinders 4 4 Displacement in cm 1998 1998 Bore stroke in mm 82 94 6 82 94 6 Compression ratio 10 2 1 9 5 1 Valves per cylinder 4 4 Start of Production...

Страница 11: ...B48TU Engines 2 Engine Mechanical 6 2 1 Engine housing 2 1 1 Cylinder head The cylinder head is made of aluminum Only slight modifications have been made to the B46TU head compared to the B46 Cylinder...

Страница 12: ...Material adaptations have to both the counterweights and the connecting rod bearing journals have made it possible to achieve weight savings of up to 1043 g 2 3 lbs A reinforced crankshaft with large...

Страница 13: ...ng rod 6 Connecting rod bearing B46TU only 7 Small connecting rod eye trapezoidal shape 8 Large connecting rod eye cracked 9 Connecting rod bolts of the connecting rod bearing cap 10 Connecting rod be...

Страница 14: ...ion and replace the oil film which briefly no longer exists between the bearing shell and the connecting rod bearing journal during the starting phase The IROX bearings are red due to their special co...

Страница 15: ...rankshaft 2 2 3 Chain drive Features Chain drive at the side of the engine emitting the forces Single part chain drive for driving the camshafts Single sleeve type chain 8 mm Electric motor of the com...

Страница 16: ...U Index Explanation A Two part chain drive B46 engine B Single part chain drive B46TU and B48TU engine 1 Slide rail 2 Top timing chain 3 Chain tensioner 4 Tensioning rail 5 Bottom timing chain 6 Camsh...

Страница 17: ...e number of teeth on the crankshaft 23 teeth and the VANOS unit 46 teeth has also changed Comparison chain track B38 and B38TU engines shown Index Explanation A Chain track two part timing chain drive...

Страница 18: ...ed acoustics Lower space requirement Reduced weight Chain tensioner Chain tensioner Index Explanation 1 Tensioning rail 2 Sealing sleeve 3 Chain tensioner with screw thread Due to the cylinder head ma...

Страница 19: ...nd B48TU engine Following the changeover from a two part chain drive to a single part chain drive the camshaft sprockets on the VANOS now have 46 teeth instead of the previous 36 teeth To compensate f...

Страница 20: ...t tensioner The belt layout is a single belt drive where all ancillary components are driven by one belt Changing the belt guiding has help to save both material and space The length of the drive belt...

Страница 21: ...nical 16 In case of incorrect assembly of the drive belt the coolant flow through the coolant pump is either insufficient or non existent there is thus a lack of cooling There is a risk of damage to e...

Страница 22: ...ction uses the electrical Split Cooling Valve SCV to enable on demand decoupling of the crankcase from the coolant flow both in the warm up phase and in partial load operation In this situation the co...

Страница 23: ...Index Explanation A High cooling requirement Split Cooling cylinder head B Low cooling requirement Split Cooling crankcase 1 Cylinder head 2 Crankcase 3 Heat management module 4 Split Cooling Valve SC...

Страница 24: ...cylinder head and crankcase is controlled individually Controlled by the Digital Motor Electronics DME the coolant is distributed by the electrical Split Cooling Valve SCV on the heat management modu...

Страница 25: ...rrent position of the rotary valve to the Digital Motor Electronics DME The exact position of the rotary valve can thus be determined so that it opens or closes a precisely defined cross section with...

Страница 26: ...Operating temperature D Transition from normal operation to maximum cooling requirement E Maximum cooling requirement X Rotational angle in angular degrees 1 Heater circuit 2 Main coolant circuit 3 Mi...

Страница 27: ...ly via a bypass in the coolant pump The rotary valve in the heat management module closes the coolant lines so that the excess pressure that builds up opens the pressure relief valve in the coolant pu...

Страница 28: ...arm up phase Warm up phase In the warm up phase the heat management module additionally opens the connection to the heating in addition to opening the bypass line The coolant flows through the cylinde...

Страница 29: ...rotary valve means that the cross sections of the respective coolant lines are open to a greater or lesser extent depending on the coolant temperature The coolant flows with a varying volumetric flow...

Страница 30: ...it diagram Maximum cooling requirement To provide maximum cooling at high dynamic loads and or high ambient temperatures the radiator connection is fully opened 100 and the bypass line is completely c...

Страница 31: ...g In combination with the heat management module the pressure relief valve on the one hand ensures that the engine operating temperature is reached more quickly while at the same time reducing leaks a...

Страница 32: ...rbocharger Exhaust turbocharger The exhaust turbocharger can be replaced individually and is exclusively made of steel The boost charge pressure is still controlled by an electrical wastegate valve Th...

Страница 33: ...uel system parts on the engine 5 1 Fuel preparation The fuel preparation has again been adapted to meet the emission legislation requirements The high pressure pump and the injectors have been revised...

Страница 34: ...chamber 2 High pressure non return valve 3 Pressure limiting valve 4 Pump piston 5 Fuel fuel quantity control valve 6 Electrical connection of fuel quantity control valve The fuel quantity control val...

Страница 35: ...sure the engine remains capable of running in this state the opening period of the solenoid valve injectors has been extended and the idle speed increased Although the vehicle remains drivable the max...

Страница 36: ...test during pre assembly at the factory in order to check the tightness After the initial assembly this plastic sleeve is of no relevance to the engine operation When the solenoid valve injectors are...

Страница 37: ...Engines 5 Fuel System 32 5 1 3 Solenoid valve injector Measures at the solenoid valve injector The following graphic illustrates the differences between the HDVE5 and HDEV6 fuel injectors Solenoid val...

Страница 38: ...njectors HDEV5 and HDEV5 EVO are used in the B46 engine While keeping the fuel system pressure of 200 bar 2900 psi HDEV5 to HDEV5 EVO a reduction in pollutant emission was achieved by changing the inj...

Страница 39: ...etermination of the density of the ambient air This information is required for various diagnostic functions In addition in the event of a failure of the hot film air mass meter a precise substitute v...

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Страница 41: ...Bayerische Motorenwerke Aktiengesellschaft H ndlerqualifizierung und Training R ntgenstra e 7 85716 Unterschlei heim Germany...

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