Best after market water pump brands 1987 fj60 2f ?

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I bet the crack started at a bolt hole from being both not tightened in sequence and over torqued.
 
Root Cause (my guess):

Seized water pump.
Moving (tight) belt connected to pully sheared the mounting face clear off the pully. Crikey!

Can't imagine anything else that could twist the face off a steel pully. Wow.

Just when I thought I'd seen everything...
 
I had a crank pulley on my 440 start to do the same. I agree that resistance is another good idea.
 
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