Hello all. I am replacing the impeller on an 85 h.p. force. I removed the water pump housing and noticed there is no gasket on between the back plate and the impeller housing. So I looked for a replacement impeller kit and or just parts that I want to replace. I found schematics showing all the parts for the water impeller, and it only shows one gasket under the back plate, then the impeller, then the pump housing. So I am wondering if I need to install a gasket, or seal the housing to the back plate this silicon, or just leave it the way it is. Any help would be awesome! Thanks in advance!