Bravo 3 . . . More Anodes

[tpenfield]

You can never have too many anodes on a Bravo 3 outdrive, it seems, particularly when using/keeping the boat in salt water.

I have been getting a bit of corrosion each season on the Starboard side outdrive gimbal ring. I probably need to do a rebuilding on the transom assembly and make sure all is good with the mercathode and continuity wires, but that is still a few years away for that exercise. So, I decided to add a couple of anodes to the gimbal ring to give it a better source of weak metal and associated electrons

I figured that right below the trim sender/limit switches would be a good place to put a clamshell anode. Here are a few pictures of the installation.

Drill & tap a 10-24 hole


Here are both drives . . .



We shall see if these make a noticeable difference at the end of the season.

 

[Scott Danforth]

also suggest a few of these when you moor

http://martyranodes.com/cm-grouper

 

[Bt Doctur]

your getting that because the trim sender wires are always powered with the ign on. They are leaking the 12V DC into the water causing the corrosion. A simple rewire with 2 diodes will stop it.
Adding extra holes to a steering arm weakens it and if a zinc was required there I`m sure the factory would have put one there

 

[tpenfield]

your getting that because the trim sender wires are always powered with the ign on. They are leaking the 12V DC into the water causing the corrosion. A simple rewire with 2 diodes will stop it.
Adding extra holes to a steering arm weakens it and if a zinc was required there I`m sure the factory would have put one there

:noidea:

My trim sender wires have been disconnected for a few years. . .

I don't leave the ignition on . . .

A small hole in the center of the gimbal ring has minimal effect on the strength of the part . . . (we had to calculate that sort of stuff in engineering school).

Since I am getting corrosion only on the starboard outdrive, I think it may have more to do with the Mercathode and continuity kit on that engine vs. the port engine. The transom assemblies (and everything else} is 22 years old, so a rebuild is in its future.

 

[Bt Doctur]

Anytime the motor is running there is 12v supplied to the wires

 

[dubs283]

From the pictures it appears the anti-fouling paint on your hull is touching the transom assy's. This can cause corrsion issues as some anti-fouling paints contain metals. It is often recommended that one leaves a minimum 1" gap between the transom assy and paint line.