BMW 3 Owners & Service Manuals

BMW 3: Belt drive

Belt drive
Comparison belt drive B46 engine and B46TU/B48TU engines

  1. B46 Engine (transverse installation shown)
  2. B46TU/B48TU engines (transverse installation shown)
  1. Deflecting element
  2. Alternator
  3. Coolant pump
  4. Air conditioning compressor
  5. Ribbed belt
  6. Torsional vibration damper
  7. 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


     Cooling System

     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



    Sensors, electrical machine Temperature sensor Rotor of the rotor position sensor Stator of the rotor position sensor So that the voltages for the coils in the stator can be correctly calculated and generated by the Electrical Machine Electronics in terms of amplitude and phase layer, the pr

     General information

    Depending on the vehicle equipment and country version, various settings for opening and closing are possible. These settings are stored for the driver profile currently used. Unlocking and locking Doors Via iDrive: 1. "CAR". 2. "Settings". 3. "Key button settings". 4. Select the symbol. 5. Sel

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