Date registered: Dec 2005
Vehicle: W210 E300DT x2/w211wagon4M / Ford SD. Seeking diesel pushmower
Location: CA Bay Area
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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.
Years ago in Tennessee I had 3 senior mechanics and supervisors of Peep Boys working over 1 hr on my W124 and they managed to put the belt wrong, giving me a BS that the slippage was due to bad tensioner. Next day at campground took me 5 minutes with manual to figure it out.