I assume you actually are referring to the raw water intake pump as I can't imagine how antifreeze would get into your fresh water system. While the theory of rebuilding this pump, to install new seals on the saft, sounds pretty easy, I found it impossible. It may be that when my pump began leaking, it was already over 25 years old and had never been taken apart previously, other than to replace the impeller and cover gasket. In any event, I found it impossible to remove the shaft from the pump no matter what I tried. You may need a hydraulic press to do so. In the end, I replaced the entire pump with one from Depco at a very reasonable price. Think of it this way: rebuilding a 25 yr old pump is like putting a new saddle on an old horse: you still have an old horse. Buy a new pump and keep the old one as an emergency spare.
