Hi
I own a 320i 6-cylinder from '86. It has driven 212.000. Yesterday the wheel which drove the fan, waterpump and carburator stopped, which resulted ind the belt that drove it was worn over instantly. Now I have consultet a repairmanual on have to replace the waterpump. But before doing so, how do I check that it really is the waterpump that is the problem?

Your request seems to say that the water pump has failed. remove and inspect the pump.