I was running a high temp gauge. I pulled off hoses after engine ran over +220 and during starts/stops it would kick down under 180. I thought it was the pump or the thermostat. As I have read in here on many excellent threads, the first and cheapest check is the aux. trans cooler inlet screen so i pulled hoses and in the screen I found wood, weeds, dirt but most worrisome was small pieces of black rubber with a lip on the end. I thought it might be the impellar from waterpump but after unhooking hoses downside there was sufficient pump action. I ran the boat hard today on Echo during a +30 day and it did not go over 180. If it gets hot again i will probably just replace impellar but will the impellar still function if 1 or two vanes on the impellar are ripped off or could i have blown some other gasket i am not aware of that ended up in screen?