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as the crankshaft is rotated it speeds up and slows down the effect of having this rubber between fan hub and outer will even out the amount the crankshaft wants to flex on most later water pumper vw this is done by the bottom pully that turns the water pump it to has an inner member a rubber band and an outer member. just like our fans not only cool our engines but reduce torsional vibration and the risk of the crank snapping. neil verdon 66 sqr on irs pan best among equals rise to the top. ------------------------------------------------------------------- Too much? Digest! mailto:type3-d-request@vwtype3.org Subj=subscribe