Re: [Amel Yacht Owners] electrolysis on jib furling gearbox? [1 Attachment]

Mohammad Shirloo

Hello and welcome to the group;
Sorry to not address you by your name but I did not see your name in the e-mail.
I cannot comment on the source of your particular issue. However if you are connected to shore power in a marina or harbor without a galvanic isolator, you are exposing the boat to a high risk of electrolysis depending on your particular location, wiring and boats surrounding you.
I would highly recommend the installation of a galvanic isolator to prevent creating an unintended electrical circuit. Olivier recommended the install on our 54 during the survey. The installation is fairly straight forward and it took us a couple of hours to get done.
Mohammad and Aty
B&B Kokomo
Amel 54 #099

From: amelyachtowners@... [mailto:amelyachtowners@...]
Sent: Tuesday, January 09, 2018 8:11 PM
To: amelyachtowners@...
Subject: [Amel Yacht Owners] electrolysis on jib furling gearbox? [1 Attachment]


Greetings and Happy New Year,

I’m new to the group having purchased “Liebling” SM hull #207 In June 2017.  Now she is “La Querida” berthed in Moss Landing, California.

Over the last several months I noticed something like grease dripping out from the jib furling gearbox and finally dismantled it last weekend.  In general it was in reasonable shape for a 20 year old gearbox.  However the aluminum  disc on the out put shaft showed considerable pitting which I interpret as electrolysis.  On my particular box, the aluminum is in contact with a bronze or brass bushing.  I did some reading on line and was quite alarmed to learn that neighboring boats and poor grounding of the marina shore power apparently can accelerate electrolysis on a well designed and maintained boat such as our Amels.  So two questions:

  1. Has anyone else experienced this electrolysis on the aluminum disc on top of the gearbox?  (or is mine indicative of a bigger problem)
  2. I briefly investigated galvanic isolators as protection for poorly grounded shore power.  Is this worthwhile?

Thanks in advance.

BTW our plans are to cruise to Mexicos west coast after retirement in about 3 years.  Saludos a todas!

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