Where are all the zincs?
Frank, I think Loren is on to something. The Yanmar 3GM in my boat came to me years ago as a raw water engine and one or two zincs in the side of the block as I recall. I rebuilt it and added the Yanmar factory heat exchanger at the same time and was surprised to learn that by doing that, I was rid of the task of changing the zinc as there are none required at all in the engine or heat exchanger, it's a Yanmar 3GMF now, 22 1/2 horses of unleashed power!! Sorry, but I can only speak to the Yanmar, I know nothing about the Universal but it sounds very familiar. Glyn Judson, E31 hull #55, Marina del Rey, CA