BMW 3: Belt drive
Comparison belt drive B46 engine and B46TU/B48TU engines
- B46 Engine (transverse installation shown)
- B46TU/B48TU engines (transverse installation shown)
- Deflecting element
- Alternator
- Coolant pump
- Air conditioning compressor
- Ribbed belt
- Torsional vibration damper
- Belt tensioner
The belt layout is a single-belt drive where all ancillary components are driven by one belt.
Changing the belt guiding has help to save both material and space.
The length of the drive belt changes due to thermal expansion and ageing. So the drive belt can transmit the required torque, it must be continuously in contact with the belt pulley at a defined pressure. To allow this to happen, the belt tension is exerted by an automatic tensioning pulley mounted on the alternator; the pulley compensates for belt elongation over the full service life.
In case of incorrect assembly of the drive belt, the coolant flow through the coolant pump is either insufficient or non-existent; there is thus a lack of cooling. There is a risk of damage to engine components and engine damage
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Split cooling
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
Heat management module
The heat management module replaces the characteristic map thermostat.
Heat management module
Electrical Split Cooling Valve (SCV)
Coolant output towards the coolant pump
Electrical actuator
Rot
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Overview
Unlocking
Locking
Stationary climate control through Remote
Engine Start
Opening the trunk lid
Press and hold or press three times in quick
succession: panic mode
Press briefly: headlight courtesy delay feature
Unlocking
General information
The behavior of the vehicle when unlocking usin
Flat Tire Monitor FTM
Concept
The system detects tire inflation pressure loss
on the basis of rotation speed differences between
the individual wheels while driving.
In the event of a tire inflation pressure loss, the
diameter and therefore the rotational speed of
the corresponding wheel changes. The difference
will be
