BMW 3: Valve gear
VANOS
VANOS unit B46 engine and B46TU/B48TU engines
- VANOS B46 engine
- VANOS B46TU and B48TU engine
Following the changeover from a two-part chain drive to a single-part chain
drive, the camshaft
sprockets on the VANOS now have 46 teeth instead of the previous 36 teeth. To
compensate for the
additional weight of the larger camshaft sprockets, the adjuster was designed to
be shorter and more
compact. Additionally, the chain track was displaced by 1.5 mm.
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Comparison belt drive B46 engine and B46TU/B48TU engines
B46 Engine (transverse installation shown)
B46TU/B48TU engines (transverse installation shown)
Deflecting element
Alternator
Coolant p
Split cooling is a new development for the B46TU engine. This cooling concept
is a modified version
of which is already used in the N63TU2.
The Split Cooling function uses the electrical Split Cooli
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Concept
The system supports the driver in making evasive
maneuvers in certain situations, such as
when obstacles or persons suddenly appear.
General information
The system issues a warning and intervenes to
support the driver if a lateral evasive maneuver is
possible. Sensors monitor and detect the
Display in the instrument cluster
The indicator light lights up and
a signal
sounds. Make sure that the safety belts
are positioned correctly. The safety belt
reminder can also be activated if objects are
placed on the front passenger seat.
Safety belt reminder for rear
seats
General information
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