Posted by Jon Hagen on July 23, 2014 at 18:45:31 from (69.26.17.61):
In Reply to: Water pumps posted by NCWayne on July 23, 2014 at 09:57:44:
There are exceptions where pure water will wreck a water pump seal. Back in the day (45-50 years ago)we farmed with a pair of Moline model GB tractors.
We ran pure water in them and drained the water in the fall before freeze up. Next spring we would add water and crank them up, usually resulting in an immediate water pump seal leak. We would have to replace pump seals every spring, as the seal bellows would be torn.
It took a frw years to realize that the seal was rusting to the cast iron impeller over winter and twisting the seal loose from the bellows at spring start up, Because the cooling system was drained for 6 months. We told the kindly old Dealer of our pump seal trouble and he recommended a fix. He sold us small jars of solible oil water pump lube. That worked well, the oily coating on the inside of the cooling system prevented the seal to impeller rusting, so that ended the pump seal damage.
Later when we went to EG antifreeze all year round, that also prevented the seal rusting / sticking.
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