Diagram for fitting a fan belt to a Mercedes 312 sprinter?

Answer 1

The diagram has to be printed somewhere. Some cars have a label in the engine compartment, some drawing in the manual.

The rule of thumb is that the crankshaft pulley needs to have about 180 degrees loop of belt on it. So looking on the engine from front and going clockwise the belt goes under the crankshaft pulley, wraps it toward 2 o'clock, where usually is a tensioner on idler pulley, than goes back toward 8 o'clock, loops on whatever is there and than wraps around all the pulleys on the engine.

http://www.benzworld.org/forums/general-Mercedes-Benz/1429423-sprinter-fanbelt.html