What zincs for a 2001 350 Mariner?

[Dark Horse]

Hey all
I am going to have my new to me boat bottom painted and want to replace all the zincs while I can.
The boats not here yet so I cant just go look at it to see what I need in the way of zincs.
I know I need the 2 zincs [1 1/2"] for the shafts but what others do i need and what are the sizes?
I want to have them In hand before boat gets here.

[bud37]

Yep the shafts should be right....there may be a plate ( divers dream ? ) on the transom, and one on each trim tab......The ones for the tabs,...... get a good size, 3" plus, usually just buy the set for rudders which comes in two halves, then put one half on each tab. Generally this is something marinas readily have in stock I would think.

But all this might depend on what a previous owner has installed and where they put them.

[Dark Horse]

Why would too.much zinc be bad

[bud37]

Qr Bbpost Why would too.much zinc be bad

Good catch.....I should have written that differently, the info, the way I wrote it was wrong.

[buster53]

Actually, some years ago, I read a Zinc thread on another boating forum and some guy posted a lengthy, almost scientific post explaining how you can over Zinc a boat. It went over my head, but he seemed to know his stuff.

[Viper]

The negative effects of too many anodes is more serious on metal and wood hulls. Fiberglass, not so much, you'll have more damage from not enough protection.

[Midnightsun]

Speaking of Anodes, yes this is the correct name for them. Boat zincs seems to have everything under one roof plus they are really well priced. Buy mine from them all the time. https://boatzincs.com

Make sure you use the correct material for your application. Zinc is for salt, Aluminum for brackish and Magnesium for fresh.

Zinc in fresh is relatively useless but will last forever. Magnesium in salt will be gone in a few weeks.

[denpooch]

I second Han's suggestion with boatzincs.com. Their prices are very good and the material heavier than West Marine. They sell a nice 'T' handle tool set for about $10.00 that makes it easy-peasy.
We have lots of stray current in my marina. I put 2 zincs on each shaft, 5" on the rudder and the big block on the transom.
The shaft zincs get the most wear.
But here is a question for the crew regarding the transom zinc.
Do you get multi season use out of them? I replace each year although there is still plenty of material left. Someone told me that I can wire brush it and reuse a second season. What say you?
Also and very important...
The transom zinc is attached to the boat using a 'thru-hull' bolt. There are two sets of 'nuts' and 'washers' on the bolt; one holding the zinc to the bolt (which we always tighten) and the second holding the bolt firm against the hull. Make sure the latter nuts are tight against the transom. Those can loosen and compromise the the effectiveness of your entire grounding system.

[denpooch]

BTW....
I used the word 'grounding'; I believe it is actually the 'bonding' system.

[Midnightsun]

Qr Bbpost BTW....
I used the word 'grounding'; I believe it is actually the 'bonding' system.

You are now officially banned from his site, simply unacceptable.

My transom zinc was in fact zinc so after 11 years it still looked like new being in a fresh water application, same with the shaft and tab zincs. I did replace them all with Magnesium and they are definitely working now. Transom unit looks like it will last at least 5++ years along with the others.