water pump problems

[adube]

We have a 99 powerstroke diesel in which we have gone through approx 6 water pumps in 14 months. we are getting about 12,000 - 15,000 miles in between repairs. We have changed the fan, belts, pully on water pump and belt tensioner. Anyone know of any issue's with Ford water pumps. The truck a 1999 F-250 4 wheel drive has 323,000 miles. We checked the run out on the last pulley mount and the new one and they both read .002" runout. Is this normal.

[djsdiesel]

What part is failing? Are you losing the bearing or the seal? Is the aluminum pitted? Are you adding additive into the coolant. Ford recommends 4 bottles of thier fw-16, when you change the coolant or water pump. You could be having electrolysis problems, if that is it the water pump is going to be the least of your worries.

[adube]

Shaft seal is failing. Aluminum is not pitted. We did not use the additive.

[djsdiesel]

I would try installing one more pump, flush the cooling system, Install new antifreeze and the coolant additive

[SCUFFY828]

just reading over this problem ,just curious if you are using aftermarket or ford pumps , are you getting them from the same place ,i have seen more than once not necesarily water pumps ,but other components where a parts store got a shipment of bad parts ,just put four clutches in a f450 until finally got one where the pressure plate fingers werent warped ,and causing clutch drag , just a thought