[Public-List] shaft zinc

Tue May 16 07:11:46 PDT 2017

I also learned a lesson many years ago after occasionally finding relatively new zincs gone including the screw and lock washer only a few months after installation.   Once when the yard manager sold me a new zinc he advised me "seat" it with a light hammer hit before attaching  the screw and lock washer.  As he pointed out most of these zincs have little casting imperfections (flashing?) on the inside where they seat with the bronze male nut.  As these thin ridges of zinc quickly wear away the zinc becomes loose on the prop nut and the lock washer becomes useless.  

I have not lost one since following his advice. 

Richard Hazlegrove
Quest 433
Mobjack Bay, VA.  

-----Original Message-----
From: J. Kingsland via Public-List [mailto:public-list at lists.alberg30.org] 
Sent: Tuesday, May 16, 2017 9:15 AM
To: Jay Davenport
Cc: Alberg 30 Public List -- open to all
Subject: Re: [Public-List] shaft zinc

Thanks!  Mike Lehman mentioned the end of shaft  solution to me after he saw that my zinc had disappeared yet again when I had my boat hauled to work on the mast wiring a few weeks ago.  I've never heard of it, and then saw this thread.  I may have to give it a go!

Gigi 

On May 16, 2017, 9:08 AM, at 9:08 AM, Jay Davenport <jaysail at yahoo.com> wrote:
>I have used the Canadian Metals end-of-shaft acorn zinc for decades. It 
>works very well. To avoid losing it, it is important to use the lock 
>washer which is packaged with each new zinc (model B). I only replace 
>the zinc after two years, when I am hauling the boat for bottom paint.
>In addition to the lock washer, I put Locktite Blue on the screw ("belt 
>and suspenders").
>Jay DavenportRevolution, A30 #526
>
>    From: J. Kingsland via Public-List <public-list at lists.alberg30.org>
>To: Mike Meinhold <meinhold272 at gmail.com>; Mike Meinhold via 
>Public-List <public-list at lists.alberg30.org>
> Sent: Tuesday, May 16, 2017 8:25 AM
> Subject: Re: [Public-List] shaft zinc
>   
>I was thinking about trying the Zinc setup at the end of the shaft on 
>my boat as well. The area where I usually put the zinc, forward of the 
>prop, is too narrow and the custom trimmed pieces of zinc I've attached 
>in the past won't stay on.
>
>Other than apparently it is not working for you Gordon, has anyone else 
>had success with it?
>
>
>Gigi Kingsland
>PERFECT intentions #146
>
>
>On May 16, 2017, 5:58 AM, at 5:58 AM, Mike Meinhold via Public-List 
><public-list at lists.alberg30.org> wrote:
>>I would think replacing the shaft nut is your only solution.  Yes, 
>>connecting a ground wire to a zinc would help temporarily.  Drilling 
>>and tapping underwater sounds tough- not that replacing the shaft nut 
>>is easy!
>>
>>Mike
>>
>>Michael J. Meinhold
>>meinhold272 at gmail.com / 301 852 0619
>>
>>> On May 15, 2017, at 10:19 PM, George Dinwiddie via Public-List
>><public-list at lists.alberg30.org> wrote:
>>> 
>>> Gordon,
>>> 
>>> From your description, I'm guessing you have an ElectroGuard or
>>Canada Metal zinc
>>(http://alberg30.org/maintenance/MechanicalPropulsion/Zincs/)?
>Wouldn't
>>it be possible to replace the zinc-nut (which the screw threads into) 
>>while in the water?
>>> 
>>> - George
>>> 
>>>> On 5/15/17 9:37 PM, gordon white via Public-List wrote:
>>>>  Went to replace the zinc on the end of the shaft today and lo and  
>>>>behold the old zinc and the socket head screw supposed to hold it
>>were
>>>> gone. It's been difficult to attach the thing, especially under
>>water,
>>>> for several years. Now it appears the threads (1/4 - 20?) are
>>completely
>>>> stripped. I know of no way to fix that without hauling out, which
>is
>>not
>>>> on the schedule until fall.
>>>> 
>>>> 
>>>>    There was no apparent corrosion on the prop
>>>> 
>>>> 
>>>>    My current solution is to drop a zinc on a piece of wire
>>overboard
>>>> and attach the other end to the engine somewhere. Probably will use
>>this
>>>> system only at my dock, as it probably would be a nuisance under
>>way. I
>>>> know of nowhere to attach it more permanently.
>>>> 
>>>> 
>>>>    My first idea would be to drill out the hole and tap it to a
>>larger
>>>> thread, but do not want to go to 5/16 if I can help it. Next idea
>is
>>to
>>>> hammer in a piece of brass rod (bronze??) or a bronze bolt and
>drill
>>and
>>>> tap that back to 1/4 - 20.
>>>> 
>>>> 
>>>>    Anyone had this problem & how did you solve it?
>>>> 
>>>> 
>>>> - Gordon White
>>>> 
>>>> Brigadoon II # 275
>>>> 
>>> 
>>> --
>>>
>>----------------------------------------------------------------------
>>>  When I remember bygone days                        George Dinwiddie
>>>  I think how evening follows morn;
>gdinwiddie at alberg30.org
>>>  So many I loved were not yet dead,          http://www.Alberg30.org
>>>  So many I love were not yet born.                          also
>see:
>>>              'The Middle' by Ogden Nash    http://idiacomputing.com
>>>
>>----------------------------------------------------------------------
>>> 
>>> 
>>> 
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