Z,
you nor your profile say what engine your talkin bout.

So is it loose on the shaft or is the shaft loose, your description isn't clear.
But when you inquire about the water pump, I wonder if your referring to the "fan bracket" that covers the t-belt & circ pump.

If your talkin bout the fan bracket on the 3.0 v6, you can bypass it with the addition of an electric fan, cheapest & best solution imo.

Toy4x
90 ExCab SR5 V6 Auto In need
99 Taco samesame(ish)