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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     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 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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     Vehicle identification number

    Engine compartment The vehicle identification number can be found in the engine compartment, on the right-hand side of the vehicle. Windshield The vehicle identification number can also be found behind the windshield. iDrive It is also possible to display the vehicle identification number via iD

     Concept, General information, Safety information

    Concept The lane departure warning alerts when the vehicle is about to run off the road or exit the lane. General information This camera-based system warns starting at a minimum speed. The minimum speed is country-specific and is displayed in the menu for the intelligent Safety systems. Warnings

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