Crankshaft assembly Mechanical system Camshafts Sensor wheel The gear drive drives the camshaft sprockets and the connected camshafts via a timing chain. The mainte nance free timing chain is tried and tested and has proven longevity. The cams are fixed to the camshaft by means of internal high-pressure forming (IHU). The sensor wheel is fixed to the exhaust camshaft. In combination with the Hall sensor, the sensor wheel makes it possible to determine the camshaft position and rpm. The Hall sensor generates a magnetic field through a built-in permanent magnet. The magnetic field is peri odically interrupted by an orifice plate on the sensor wheel while the engine is running.
The signal which this generates is used by the CDI control unit and serves as a substitute signal for emergency engine operation if the position sensor for the crankshaft fails. Camshaft sprocket The camshaft sprocket is connected to the camshaft by a center bolt. The center bolt of the camshaft has a left-hand thread. Exhaust camshaft with sensor wheel 1 Drive gear 2 Exhaust camshaft 3 Sensor wheel with orifice plate 16 Introduction of New Generation of 4-Cylinder Inline Engines, OM 651 q – This printout will not be recorded by the update service. Status: 09 / 2008 –