Since water pumps are a known trouble spot on Contours -- mainly on duratecs, but zetecs are not exempt -- I would get a new one and stick it in while the timing belt is off. My mechanic friend tells me this is a good policy with cars in general.
When we did mine, we bought the tensioner, but returned it because the old one was fine; it was the little idler that was bad.
96 GL Zetec ATX, white with pinstripe, nickname " Sam Smooth " mods so far: CTA intake with homemade heat shield, KVR drilled front rotors & carbon pads w/ 500° fluid planned mods: exhaust (want to keep it quiet), e-ram (awaiting installation), diablo chip involuntary mods: compression increased after head gasket failure
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