BMW 3 Owners & Service Manuals

BMW 3: Valve gear

VANOS

Valve gear
VANOS unit B46 engine and B46TU/B48TU engines

  1. VANOS B46 engine
  2. 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

     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

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     Evasion assistance

    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

     Safety belt reminder for driver's seat and front passenger seat

    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 Th

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