[Public-List] Boom-end bolt problem

Fri Sep 18 11:29:05 PDT 2015

Jason and Dan, 
Was the lock nut a regular nut or one of the nyloc (R) type of locknuts? A Nyloc would perhaps allow the bolt to be loosened until it contacts the inside of the aluminum casting. Usually lock nuts are tightened hard against the inside surface. This is a situation of dissimilar metal corrosion, Aluminum Casting and Stainless Steel bolt. 
Dan if you want to get into this you will need to drill out the rivets and remove the boom end casting from the boom extrusion. I would not attempt to force out the SS bolt. It will either twist off or perhaps worse break the aluminum casting. Once the cap is off you can try soaking in solvents and heating the bolt.  Or just place on drill press and drill out the bolt from the casting. 
Michael #133 

----- Original Message -----

From: "kk4mex via Public-List" <public-list at lists.alberg30.org> 
To: dans at stmktg.com, "Alberg 30 Public List -- open to all" <public-list at lists.alberg30.org> 
Sent: Thursday, September 17, 2015 9:45:19 PM 
Subject: Re: [Public-List] Boom-end bolt problem 

I had to drill rivets out of boom end cap with screw. Once the ence cap was off there was a lock nut holding bolt in place.Just re-riveted end of boom back on 
Jason #457Www.svsalacia.blogspot.com  

Sent from my Verizon Wireless 4G LTE smartphone 

-------- Original message -------- 
From: Daniel Sternglass via Public-List <public-list at lists.alberg30.org> 
Date: 09/17/2015  9:34 PM  (GMT-05:00) 
To: Alberg-30 List <public-list at alberg30.org> 
Subject: [Public-List] Boom-end bolt problem 

Hello, 

After reading a recent posting, I decided I should check-out the bolt at 
the end of the boom that secures the mainsheet attach plate. The 1966 
boat has always been in fresh water, and the bolt looks perfectly 
shiny.  Occasionally I have tightened this bolt, but otherwise I have 
not paid much attention to it. 

Today I went to the boat and attempted to back the bolt out to see what 
kind of shape the bolt and plate were in. The bolt would turn only about 
_one revolution_, and then "hard stop." That was enough for me to see 
that the hole in the plate is not elongated. It tightens completely, but 
only will rotate one turn. 

I don't want to over-torque it trying to back it out. It's possible that 
it is dissimilar metal corrosion, but if it were corrosion, usually it 
would get progressively harder to turn, but this feels like a stop  It 
might be the original bolt, I don't specifically remember replacing it. 
I would have put some isolating caulking in if I had. If it's feeding 
through a bolt or thread tapped in the end-plate, the corrosion may be 
on the bolt on the far side of that, and the strength would be retained, 
but I am not sure... 

Any ideas on what is happening? If you've seen this sort of problem, I'd 
appreciate any suggestions. The next 6 weeks is the peak of the sailing 
season here in central, NY with much higher winds, so I hope to address 
this soon. 

Thanks,. 

--Dan Sternglass 
Watcher of the Skies, #201, 1966, Cayuga Lake, Ithaca, NY 

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