brake BMW 645Ci COUPE 2001 E63 N62B44 Engine Workshop Manual

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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