Anodes

[Johnnygil]

Ok peeps here we go a really silly and basic Question

But how do you change Anodes and add new ones, do you have to use a sealant type thing between anode and hull

where does the electrical wire go to if there is one

Cheers

J

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[Medskipper]

If the bolts go right through your hull they can come loose when unbolting the anode. If they do, then yes you should reseal the bolts through the hull with a good quality mastic made for this purpose. I cannot remember the name of the one I use, but a chandler will advise you if you explain what you want the mastic for.

The cables should be fixed onto these bolts and should run to an earth point.

Its all a quite simple job

Barry





<hr width=100% size=1>I just want to retire with my boat to the Med!

 

[Johnnygil]

thanx barry

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[Medskipper]

I forgot to mention that you need magnesium fresh water or zinc for saltwater.

Barry


<hr width=100% size=1>I just want to retire with my boat to the Med!

 

[Andrew_Fanner]

What if you do a mix of both fresh and seawater? Which metal is then better, given that I asume one of each Mg and Zn is a silly idea.

<hr width=100% size=1>Two beers please, my friend is paying.

 

[longjohnsilver]

Anodes will normally have a foam rubber type backing pad which goes between it and the hull.

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[Medskipper]

If you do most of your boating in freshwater then use magnesium, the odd trip down stream into salt water will not give you any problems.

If most of your boating is in salt water use zinc. The odd trip into fresh water still will not be a problem.

If its a fifty/fifty split I guess you can use both types. generally what will happen is one or the other gets a sort of coating on it and then stops working properly.

Barry



<hr width=100% size=1>I just want to retire with my boat to the Med!

 

[TheBoatman]

John
Make sure that all the submersed metal bits are connected electrically also that the engine/shaft/prop are also in the line.
If you have a flexable coupling make sure that there's an electrical contact across it.

I used earthing braid wire between everything and then "buzzed" it out after I finished.

I see from your profile that you are a telecoms eng so check the continuity between all the metal bits<s>.

You may need to fit more than 1 anode?

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[David2452]

If by mixed you mean brackish rather than sometimes in salt water and other times in fresh then you neen aluminum annodes.

David

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[Johnnygil]

Boat

Thanx for reply but what do you mean "by in line" with regards to shaft prop and engine?

John

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[TheBoatman]

By "in line" I mean electrically. You should have the engine/gearbox/shaft "conected together", the problem comes if you have a flexable coupling between the gearbox and prop shaft as this will break the electrical contact so you will need to bridge it with a wire or similar.

The bottom line is you should be able to check the continuity between any anode and any piece of under water metal and get a "buzz".

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