I am running an older sears boat with the original motor still on it. A Sears 45 hp model# 574.59783 Until recently I have had no problems. I have started the enine and it seems to be running fine until I noticed the engine was over heating and water was not exiting the engine. So I assume The water pump shall be the problem but yet I am unsure of how this works or where to find it. With the engine being so old I am unable to locate any information on how to address the problem on the net. I am sorry if this message seem incomplete but the boat has been mine for only 3 years. If anybody can help it would be greatly appreciated.