Dave, what do the broken pumps look like when you remove them? I mean are the impellers okay & such.
Any visible signs of damage or warpage?
The only thing I can think of is the mounting surface between the pump & block is faulty, or now not flat anymore...
How often has Ford changed it for you. That would be a good place to start and investigation to see why you keep getting failures. A complete history of your waterpump problems (shown to the shop manager) might go a long way towards solving the problem..
Good luck!
