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On my Mercedes sprinter the cause of the fan belt vibration at low idle speed was the pully on the alternator.This pully should ratchet in one direction.
You can find a diagram for fitting a fan belt on a Mercedes 308D Sprinter in the owner's manual. You can also find it at select auto part stores.
The fan belt in a Mercedes Sprinter is a crucial component of the engine's cooling system, responsible for driving the cooling fan and other accessories like the alternator and power steering pump. If the fan belt is worn or damaged, it can lead to overheating or loss of power steering. Regular inspection and maintenance are essential to ensure its proper function. If replacement is needed, it's important to use a compatible belt specific to the Sprinter model for optimal performance.
Take it to a mercedes garage
The fan belt is fit onto a Mercedes Vito by loosening the alternator bracket and allowing it to move downward. The belt can then be slipped over the remaining pulleys and then back over the alternator.
How much it is going to cost
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
on a 2007 the fan has to come off mine is in shop now getting done 3.8 billable houres
To replace the fan belt on a Sprinter 208, first ensure the engine is off and cool. Locate the serpentine belt tensioner and use a wrench to relieve tension on the belt. Remove the old belt from the pulleys, then route the new belt according to the belt diagram usually found under the hood. Finally, reapply tension using the tensioner and double-check the alignment before starting the engine.
To replace the fan belt on a 2003 Mercedes ML 270 CDI, start by disconnecting the negative battery terminal for safety. Then, locate the tensioner pulley and use a wrench to release the tension on the old belt. Remove the old belt, routing the new belt according to the belt diagram typically found in the engine compartment. Finally, ensure the belt is properly seated on all pulleys, reapply tension, and reconnect the battery.