100K Water pump and drive belt

[dogsridewith]

No way. Good chance you're killing the water pump bearings. Running too tight wouldn't help the belt either. (How do you think you would be able to know too-tight by observation...when saying "seems perfect?")

By the way. The manual's serpentine belt tension treatment is a Mind of Toyota cluster-fluff. I won't recommend a method for anyone else, but mine is an initial set to not-too-tight by feel, matchmark, and tighten in tiny increments when hearing a chirp at startup. (I'd carry tools if making a trip on a new belt.)

I'm tightening by a 13 inch channel lock plier w/ jaws on the end of the curve-slot adjuster bar and the alternator's upper bolt boss. (Toyota manual wants prybar but be careful to miss the critical mechanism right there some where hard to see and same color as the other metal engine parts.)