BMW E46 320d water pump, thermostat, belts and deflection pulley replacement

This is a multiple repair/replacement guide for BMW E46 320cd/d with M47TU engine, but it might also work on other BMW diesel engines like a 330d with M57 engine for example. In this repair guide I am replacing main thermostat, water pump, drive belt and AC belt and deflection pulley. Hope that will help someone.