Re: WOB Corrosion

Eric Freedman

Hi Kent,


That looks like a delicate job. Good luck with the work.


Looking at the picture again, had to tried to put a screwdriver or small chisel in the place where the set screw was and try to rotate the bearing, If you can get it to rotate. Possibly you can get some purchase on the lip of the bearing and pry it out. If I see the photo correctly, a pair of channel lock pliers might allow rotation and removal.


If that doesn’t work and  you have a flex shaft attachment for a dremel tool that would make the work a lot easier. As a jeweler that is the way I would VERY carefully grind out the remains of the bearing.

Another possibility is to drill and tap it in a few places and try  to pull it out with the screws installed in the tapped holes. Use brass screws I case they break off.



If you cover the bolts on the prop shaft zincs with varnish or nail polish, the area around the screws last a lot longer.

Fair Winds


Amel Super Maramu #376



From: [] On Behalf Of karkauai via Groups.Io
Sent: Saturday, March 28, 2020 3:32 PM
Subject: [AmelYachtOwners] WOB Corrosion


Hi All,

I’m hauled out for bottom paint and servicing the Amel-supplied WOB and bow thruster seals.  It has been 4.3 years as I have had Island 44 on the bottom, and it lasts that long.  No water ingress and no oil loss.”, so I haven’t done the service until now.  Please see the pic of the WOB.  It is crumbling apart as if it were damaged by corrosion/electrolysis.  The hull potential has been perfect at -980mv every time I’ve checked it, and the rudder zincs have lasted almost a year with normal erosion.  I have used prop zincs on it since I had the prop shaft electrolysis a few years ago.  They have disappeared after a few months, mostly because they erode at the bolt hole edges and fall off, rather than completely erode away.

It’s going to be a bitch to get out, but bigger question is why did it corrode?  Any thoughts?  

Thanks in advance,
SM 243

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