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Old 05-05-2012, 06:47 AM   #1
Formula
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Originally Posted by jrc View Post

Have the dealer change the anodes to magnesium before she goes in the lake. The dealer should be able to get them for free from Mercury.
Why have them changed if the boat has not seen water (except for the test tank)?
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Old 05-05-2012, 07:39 AM   #2
Captn'J
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Originally Posted by Formula View Post
Why have them changed if the boat has not seen water (except for the test tank)?
Nice boat - looks like you even had a tour of the factory; good luck!!

Electrolysis occurs at the Lake (Not as much as Salt Water) but it's here; especially around busy marinas where there are a lot of shore power hooks ups. Mercruiser installs aluminum or zinc anodes from the factory which is meant for the salt water; magnesium is a much softer metal which is more prone to be eaten away with electrolysis. If you keep the harder metal on for anodes the electrolysis in the water over time will attack your outdrives; using magnesium in fresh water and changing every season will prolong the life of those new B3 drives.

Captn'J
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Old 05-05-2012, 09:15 AM   #3
jrc
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Originally Posted by Captn'J View Post
... Mercruiser installs aluminum or zinc anodes from the factory which is meant for the salt water; magnesium is a much softer metal which is more prone to be eaten away with electrolysis. If you keep the harder metal on for anodes the electrolysis in the water over time will attack your outdrives; using magnesium in fresh water and changing every season will prolong the life of those new B3 drives.

Captn'J
Exactly, I had some paint peel off a new set of B3's in two seasons. Stopped the peeling dead in it's tracks by changing to magnesium. In the past, Mercury said they will swap new boat anodes to the correct ones for the target waterway for free at delivery.
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