oil BMW 745i 2005 E65 N62B44 Engine User Guide

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N62 Engine
When the solenoid valve switches over, oil pressure is applied to chamber B. This forces
the blades (and hub) in a clockwise direction back to the initial position, again changing the
camshaft timing.
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procedure together with the pressure progression
based on the VANOS unit for the exhaust camshafts.
During this adjustment chamber A is open (through the solenoid) to allow the oil to drain
back through the cylinder head (internal reservoir).
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42-02-44 Hydraulic Actuation - Chamber B
1. Front View of VANOS Unit 5. Engine Oil Pump
2. Side View of VANOS Unit 6. Oil Return (Switched through Solenoid)
3. Camshaft Oil Port (Chamber B) 7. Supplied Oil Pressure (From Engine Oil Pump)
4. Solenoid Valve

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N62 Engine
The chart below shows the VANOS unit camshaft adjustment possibilities. The valve lift
adjustment has also been incorporated.
The special feature of Valvetronic is that the air mass drawn in the cylinders can be easily
determined by the valve lift and closing time. The air mass can then be limited, thus the
term “load control”.
With the help of VANOS, the valve closing point can be easily selected within a defined
range. With valve lift control, the opening duration and cross section of the valve opening
can also be easily selected within a defined range.
Vacuum pump
The N62 engine requires a vacuum pump for the vacuum
assisted brake booster. With the throttle valve open while the
car is being driven, additional vacuum is needed.
The N62 vacuum pump has a second vacuum connection
(small hose) for the exhaust flap adjustment. The vacuum
pump is driven by cylinders 1-4 exhaust camshaft via the
VANOS unit. The pump is lubricated through an oil gallery
from the cylinder head.
42-02-03
Chart Exhaust & Intake Valve
1. Exhaust Valve Open
2. Exhaust Valve Closed
3. Intake Valve Open
4. Intake Valve Closed

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N62 Engine
Chain Drive
The camshafts are driven by a toothed chain, one for each cylinder bank. The oil pump is
driven by a separate roller chain.
1. Sensor wheels for the camshaft position sensor, cylinder bank 1-4
2. Tensioner Rail, Cylinder 5-8
3. Chain Tensioner, Cylinder Bank 5-8
4. Sensor Wheel for the camshaft position sensor, cylinder bank 5-8
5. Upper timing chain guide with integrated oil jet
6. Guide rail
7. Sprocket for Oil Pump Drive
8. Timing case lower section
9. Tensioning rail, cylinder bank 1-4
10. Solenoid Valve, VANOS exhaust camshaft
11. Solenoid Valve, VANOS intake camshaft
12. Upper Timing Chain Cover
13. Chain Tensioner, Cylinder Bank 1-4
14. VANOS exhaust camshaft Bank 1-4
15. Upper Timing Chain guide with integrated oil jet
16. VANOS intake camshaft 1-4Chain Drive
43-02-50

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N62 Engine
Toothed Chain
The camshafts are driven by the crankshaft
using newly developed maintenance free
toothed chains.
The toothed chain gear wheels are located on
the crankshaft and on the VANOS unit. Use of
the new toothed chains (1) optimizes the drive
chain rolling process and reduces noise.
Crankshaft Sprocket
The crankshaft sprocket (3) has three sets of gear
teeth:
1. One roller chain gear wheel for the oil pump drive.
2. Two toothed chain gear wheels for the camshaft drives.
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The sprocket will also be fitted to a 12-cylinder
engine variant which will be available in the future.
Please observe the installation instructions and the rel-
evant labels (V8 Front/V12 Front) when installing the
sprocket.
Chain Tensioner (cylinder bank 1-4)
A chain tensioner is mounted in the side of the cylinder
head for each camshaft drive chain. There is a guide
ball in the chain tensioner tip that moves in an arched
groove in the tensioning rail.
The tensioner seal must be replaced each time the
tensioner is disassembled. The tensioners are the
same for both the left and the right cylinder heads.
42-02-51
42-02-52
Chain Tensioner
1. Chain Tensioner
2. Tensioning Rail
3. Bearing Pin
42-02-55

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N62 Engine
Tensioning Rail Bearing Pin
The bearing pin for the cylinder bank 1-4 drive
chain tensioning rail is hollowed. There is a ball
(check) valve in the bearing pin. The valve
opens at an oil pressure of 1 bar and allows
engine oil to flow to the tensioning rail via a port
(1).
Chain Tensioner (cylinder bank 5-8)
An oil jet has been fitted to lubricate the cylinder bank
5-8 drive chain. There is a valve in the oil jet which
opens at a pressure of 1 bar and supplies the drive
chain with engine oil.
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Refer to the Repair Instructions when using the
Special Tools shown below to adjust the camshaft tim-
ing.
42-02-53
42-02-54 Tensioning Rail Bearing Pin
1. Engine Oil Port to Tensioning Rail
2. Ball (check) Valve
3. Bearing Pin
4. Sealing Rings for Sealing the Tensioning Rail
Chain Tensioner
1. Chain Tensioner
2. Tensioning Rail
3. Oil Jet
42-02-7842-02-79

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N62 Engine
Cooling System
Coolant Circuit - 14 Liter Coolant Capacity
42-02-56
Cooling System (Circuit Flow)
1. Cylinder Head Bank 5-8 12. Radiator
2. Coolant Supply (heater core) 13. Radiator Partition (low temp section)
3. Water valve with electric water pump 14. Temperature Sensor
4. Cylinder Head Gasket 15. Water Pump
5. Coolant Supply Line 16. Radiator Return Flow
6. Cylinder Head Ventilation Lines 17. Radiator Ventilation Line
7. Hole (crankcase venting system) 18. Expansion Tank
8. Transmission oil lines 19. Thermostat
9. Oil/water heater exchanger for automatic transmission 20. Cylinder Head Bank 1-4
10. Thermostat for transmission oil heat exchanger 21. Vehicle Heater
11. Alternator Housing 22. Radiator (High Temperature Area)

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N62 Engine
The coolant flows to the rear of the engine block, from there through the side channels to
the cylinder walls and then into the cylinder heads (lower left picture). The cast aluminum
cover at the rear of the engine block (with sealing bead) is shown on the lower right.
Water Pump/Thermostat Housing
The water pump is combined with the thermostat housing and is bolted to the timing case
lower section.
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The impeller is made from reinforced plastic.
42-02-59
Water Pump / Thermostat Housing
1. Map-controlled themostat (radiator cool return flow).
2. Electrical connection for Thermostat Heating element.
3. Thermostat Mixing Chamber
4. Temperature Sensor (hot coolant from engine)
5. Radiator in-flow (hot coolant from engine)
6. Heat exchanger (transmission oil return flow)
7. Leakage Chamber (evaporation space)
8. Alternator in-flow (cool supply)
9. Water Pump
10. Expansion Tank Connection

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N62 Engine
Map-controlled Thermostat
The map-controlled thermostat allows the engine to be cooled relevant to operating con-
ditions. This reduces fuel consumption by approximately 1-6%. The electrical connections,
the design and the map-controlled thermostat response have been enhanced. The map-
controlled thermostat function is the same as previous engines (M62).
Cooling Module
The cooling module contains the following main cooling system components:
• Cooling radiator
• Air conditioning condenser
• Transmission oil/water heat exchanger
• Hydraulic fluid radiator
• Engine oil radiator
• Main electric fan
• Fan shroud for viscous coupling fan
All the components (with the exception of the transmission oil radiator) can be removed for
repairs without disassembling any other coolant circuit. All connections have been fitted
with the quick-release coupling which are used in current models.
Maped-Controlled Thermostat
1. Radiator Return Flow To Thermostat
2. Connection for Thermostat Heating Element
3. Temperature Sensor
4. Radiator in-flow (hot coolant from engine)

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N62 Engine
Cooling Radiator
The radiator is made from aluminum and is divided into a high-temperature section and a
low-temperature section by a partition wall (see coolant circuit diagram). The coolant first
flows into the high-temperature section and then back to the engine, cooled.
Some of the coolant flows through an opening in the radiator partition wall to the low-tem-
perature section where it is cooled further. The coolant then flows from the low-tempera-
ture section (when the ÖWT thermostat is open) into the oil/coolant heat exchanger.
Coolant Expansion Tank
The expansion tank is mounted on the right hand wheel housing (engine compartment).
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The expansion tank should never be filled above the Max marking. Excess coolant is
expelled by the pressure relief valve in the cap as it heats up. Avoid overfilling the expan-
sion tank because the cooling circuit design ensures very good “self bleeding”.
Cooling Components
1. Cooling Radiator 4. Engine oil/air heat exchanger connection
2. Expansion Tank (hot countries only)
3. Water Pump 5. Transmission oil/coolant heat exchanger

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N62 Engine
Transmission Oil/Coolant Heat Exchanger
The transmission oil/coolant heat exchanger ensures that the transmission oil is heated up
quickly and also that it is appropriately cooled. When the engine is cold, the transmission
oil/coolant heat exchanger thermostat switches into the engine's recirculated coolant cir-
cuit. This allows the transmission oil to heat up as quickly as possible (with the engine
coolant).
When the return flow water temperature reaches 82 ºC, the thermostat switches the trans-
mission oil/coolant heat exchanger to the low-temperature coolant radiator circuit (refer to
the cooling circuit diagram) to cool the transmission oil.
Electrically Operated Fan
The electric fan is integrated in the cooling module and is mounted directly in front of the
radiator. The speed is regulated by the ECM.
Viscous Coupling Fan
The viscous coupling fan is driven by the water pump. The noise output and the perfor-
mance of the fan coupling and the fan wheel have been optimized as compared with the
E38M62. The viscous coupling fan is used as the final level of cooling and switches on at
an air temperature of 92 ºC.
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