SD20 Internal Anode (Fresh Water)

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Mvallus
Posts: 24
Joined: Mon Sep 22, 2014 9:40 pm

SD20 Internal Anode (Fresh Water)

Post by Mvallus » Mon Oct 21, 2019 1:52 pm

Does anyone know who stocks replacement internal magnesium anodes for the sail drive? I sail in Freshwater. Perhaps I should just replace it with the basic zinc version, which seems to be more available.

https://www.boatzincs.com/yan27210200550M.html

TSweather
Posts: 12
Joined: Thu Aug 03, 2017 9:24 pm

Re: SD20 Internal Anode (Fresh Water)

Post by TSweather » Fri Nov 01, 2019 12:02 pm

In fresh water you absolutely need to use the correct anodes or the aluminum saildrive will take on the role of the sacrificial part. Any Yanmar dealer will have the magnesium anodes you need. Mackboring.com definitely sells them, though I just go through our local yard RCR yachts in Buffalo.

They should be changed annually as once they degrade too badly they can fall apart inside the saildrive or can require some serious work to remove. Ours is pretty eaten up each year, which means it's doing its job.

Mvallus
Posts: 24
Joined: Mon Sep 22, 2014 9:40 pm

Re: SD20 Internal Anode (Fresh Water)

Post by Mvallus » Tue Nov 26, 2019 8:49 pm

Thank you for the advice...FYI, boatzincs now have the magnesium version back in stock:
https://www.boatzincs.com/yan27210200550M.html

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