fan belt mercedes 208?

ive got amercedes 208 diesel j redg 1991, its an ice cream van done 250000 miles n runs sweet, exept for a constant fan belt screach which is winding me up a treat !!!!! ive replaced the belt the spring and ram tensioner and the roller bearing, and its still screaching , merc dont do a manual for this van, any ideas ???????????
sean, May 2010


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