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Old 05-22-2011, 09:57 AM
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Default BMW N55 engine - service training

  • BMW N55 engine - service training. 100 pages. Language - English.
After completion of this module you will be able to:

Describe the features of the N55B30M0 engine
Describe the specifications of the N55 engine
Identify the internal and external components of the N55 engine
Understand the function of the crankcase ventilation on the N55 engine
Understand the function of the electronic volume control oil pump

Contents:

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Engine Components/Systems Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Full Load Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Current Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Engine Designation and Engine Identification . . . . . . . . . . . . . . . . . . . . .11
Engine Designation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Breakdown of N55 Engine Designation . . . . . . . . . . . . . . . . . . . . . . . .12
Engine Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Engine Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Engine Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Engine Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Crankcase and Bedplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Crankshaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Crankshaft Main Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Pistons and Rings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Connecting Rod and Bearings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Oil Pan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Electrionic Volume-controlled Oil Pump . . . . . . . . . . . . . . . . . . . . . . . . . .23
Oil Pump and Pressure Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Oil Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Oil Filtration and Oil Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Oil Spray Nozzles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Oil Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Oil Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Oil Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Cylinder Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
Cylinder Head Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Crankcase Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Naturally Aspirated Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Boost Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Valvetrain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Intake and Exhaust Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Valve Springs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Camshafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Valve Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
VANOS System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44
VANOS Solenoid Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Cam Sensor Wheels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Valvetronic III . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Phasing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Masking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Combustion Chamber Geometry . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Valve Lift Adjustment Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
Valvetronic Servomotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Belt Drive and Auxiliarly Components . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
Vibration Damper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Air Intake and Exhaust System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Air Intake System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56
Intake Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Fuel Tank Ventilation System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
Exhaust Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61
Turbocharger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
Function of the twin scroll turbocharger . . . . . . . . . . . . . . . . . . . .65
Diverter valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65
Catalytic Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66
Exhaust System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
Vacuum System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68
Vacuum Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
Fuel Injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71
Fuel Pressure Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
High Pressure Fuel Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
Fuel Injectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74
Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
N55, Cooling System Components . . . . . . . . . . . . . . . . . . . . . . . . . . .77
Oil Cooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
Coolant Passages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80

Engine Electrical System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82
Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83
Engine Cooling Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85
Digital Motor Electronics (DME/ECM) . . . . . . . . . . . . . . . . . . . . . . . . . . . .87
Digital Motor Electronics Circuit Diagram . . . . . . . . . . . . . . . . . . . . . .88
N55, MEVD17.2 Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88
Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90
Fuel supply system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90
Fuel quantity control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90
Boost pressure control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90
Engine cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91
System Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92
Crankshaft Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92
Ignition Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
Oil Pressure Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95
Oxygen Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95
Oxygen sensor before catalytic converter . . . . . . . . . . . . . . . . . . .96
Oxygen sensor after catalytic converter . . . . . . . . . . . . . . . . . . . . .96
Hot-film air mass meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97
High Pressure Fuel Injector Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97
Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98

Service Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
Cylinder Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
Cylinder Head Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
Fuel Injectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
Ignition Coils . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100
Attached Files
File Type: pdf www.bmwcoders.com_ST916 - N55 Engine.pdf (3.07 MB, 1568 views)


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  #2  
Old 05-29-2011, 08:58 AM
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This is a good reference, since my F07 has some noisy sounds from the engine room.
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Old 06-09-2011, 12:01 AM
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Thanks, this looks really useful.
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  #4  
Old 06-14-2011, 04:43 PM
Tom Tom is offline
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Is this a good reference for a F10 535?
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Old 06-18-2011, 08:00 PM
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thanks, great info:)
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Old 06-23-2011, 06:32 AM
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thanks for your help
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Old 06-24-2011, 03:22 AM
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great info. Thanks
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Old 06-25-2011, 04:57 AM
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Thanks for posting this module
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Old 06-27-2011, 10:56 AM
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I was looking for this, thanks
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Old 07-01-2011, 01:23 PM
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Hi all,
Anybody have S65 and M car details? some one can help me?
Thank you,
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