air filter BMW 745i 2003 E65 N62B44 Engine Workshop Manual

Downloaded from www.Manualslib.com manuals search engine Throttle Valve
The throttle valve on the N62 is not necessary for engine load control. This is carried out
by the intake valves variable lift adjustment.
The tasks of the throttle valve are:
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Airflow is controlled by the throttle valve during the starting procedure when the air temp-
erature is between 20 ºC and 60 ºC, .
If the engine is at operating temperature, it will be switched to non-throttle mode approx-
imately 60 seconds after start up. In cold conditions however, the engine is started with
the throttle valve fully opened because this has a positive effect on the starting characteris-
tics.
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This vacuum is needed to exhaust the blow-by gases from the crankcase and the fuel
vapors from the activated charcoal filter.
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If the Valvetronic system should fail, the throttle valve implements conventional load con-
trol).
7
N62 Engine
42-02-25
Throttle Valve
• Throttle Valve Housing with Throttle Valve.
• Throttle Valve Actuator
• Two Throttle Valve Potentiometers

Downloaded from www.Manualslib.com manuals search engine Secondary Air Pump (SLP)
The electrically-operated secondary air pump is mounted to the vehicle body. The pump
draws out filtered fresh air from the air cleaner housing during the warm-up phase and sup-
plies it to the two secondary air Non-return Valves.
Once the engine has been started, the secondary air pump is supplied with voltage by the
ECM via the secondary air pump relay. It remains switched on until the engine has taken in
a certain amount of air.
The O ON
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period may be a maximum of 90 seconds and it depends on the following engine
operating conditions:
• Coolant temperature (from -10 ºC to approximately 60 ºC)
• Air temperature (NTC sensor in HFM)
• Engine speed
One non-return valve is mounted on each cylinder head (see also Engine Views).
The non-return valves are opened by the pressure generated from the secondary air pump.
The secondary air is led through a pipe to the secondary air ducts (integral in the cylinder
heads) for distribution into the exhaust ports.
The non-return valves are sprung closed when the secondary air pump is deactivated. This
prevents exhaust vapors, pressure and condensation from flowing back into the secondary
air pump.
15
N62 Engine
43-02-14
View From Rear of The Cylinder Head
1. Cylinder Head Lead
2. Non-return Valve (SLV)
3. Secondary Air Pump Connection

Downloaded from www.Manualslib.com manuals search engine 49
N62 Engine
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Oil Pressure Switch
The oil pressure switch is located on the side in the bank 1-4 cylinder head.
Oil Pump
The oil pump is mounted at an angle to the crankshaft bearing cap and is driven by the
crankshaft using a roller chain. The oil pump is a two-stage gear oil pump with two paral-
lel switched gear clusters.
The two pair of gear clusters are stacked one
behind the other and work in two stages.
Stage two (both pump supply circuits) is only
active in the lower engine speed range up to
approx. 2,000 rpm to provide sufficient oil pres-
sure for the VANOS at high oil temperatures.
Stage two is deactivated hydraulically at a pres-
sure of 2 bar.
42-02-73
42-02-75
42-02-76 Oil Pump
1. Drive Shaft
2. Mounting Points
3. Oil Filter
4. Pressure Relief Valve (over 15 Bar)
5. Control Valve (Pump Stage/Pressure Control)
6. Oil supply from the oil pump to the engine
7. Oil pressure control tube from the engine to
the control valve.