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Curious water pump pulley design 850

posted by  Ken Temkin on  Sat Nov 23 17:48 CST 2013
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last visit: Wed Oct 22 12:06 CST 2014
[RELATED]

Just completed my 200,000 mile timing belt change, changing the water pump and all the idler pulleys, the hydraulic tensioner, belts, etc.

I noticed a strange design . . . the replacement water pump pulley has equally-spaced teeth, to mate with the timing belt, around the entire circumference of the pulley. The original, Volvo pulley, however, skips a tooth every after every third tooth and, at one point, after every second tooth.

A very strange design, but apparently purposeful.

Any ideas as to why this design?





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