i have a elgin 5 hp model #571-58561 put a new impeller in but engine overheats and stops.no water comes out of the coolant flow indicator. can't seem to find a water flow diagram on the net.there is a solid gasket between power head and water flow indicator.where does the cooling enter and where does it pass through the system then exit?i have been looking for this info for days on the net,if there is a blockage where would i look first? don't want to take anything apart unless i know what to do.thank you,john