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BMW N55 User Manual
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43
N55
Engine
VA
N
O
S
Syste
m
N54,
VA
N
O
S
with
oil
supply
Inde
x
Explanation
1
Main
oil
duct
2
VA
N
O
S
solenoid
valve
,
intak
e
side
3
VA
N
O
S
solenoid
valve
,
ex
ha
u
st
side
4
Chain
te
nsion
er
5
Non
re
tu
rn
val
ve,
ex
ha
us
t
side
6
Non
re
tu
rn
val
ve,
intak
e
side
7
VA
N
O
S
adjustment
unit,
ex
ha
u
st
side
8
VA
N
O
S
adjustment
unit,
intak
e
side
42
44
Table of Contents
Default Chapter
1
Table of Contents
1
Subject Page
2
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
Subject
41
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
Subject
90
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
4
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BMW N55 Specifications
General
Brand
BMW
Model
N55
Category
Engine
Language
English
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