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Old 04-02-2013
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Re: Why doesn't my Perkins have any Zincs?

You probably have the same situation as me and my Yanmar...

I went through this last fall. I bought 2 pencil zincs because the manual stated that the 3GM30 had zincs that required maintenance. I bought 2 and went to the boat. I could not find the screw plugs that the manual said was there! I went back to the shop and they asked if I had a 3GM30 OR a 3GM30F? I said I had the 3GM30F. I was told that the fresh water cooled (IMO should be known as antifreeze cooled) Yanmars didn't need zincs due to the special metal used in the exchanger...So I researched because I'm nuts about boat things and I need to know! I found out that the material used for that heat exchanger was something called cupronickel which has a very high resistance to corrosion, many heat exchangers are simply copper and do require zinc protection. Here is a link on Cupronickle.

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