I replaced all the seals in my 500 water pump and it still cried. You have to do what Dez said Jerry recommended. Remove the impeller bolt washers and impeller and grind off a few thousandths of an inch of material from the impeller shaft (the shaft is what the impeller mounts on and the bolt and washers go into you're grinding off surface area where the bolt hole is at). If you don't do this you will need to replace the mechanical seal impeller shaft and impeller to stop the crying. When you reinstall the impeller bolt make sure you use red loctite (I forgot this step and the bolt backed out and my impeller grinder a nice reminder in the back side of my water pump cover).