[C38] Fw: Keel Stub Wood Removal reveals Keel Bolts need replacement?

[Charles]

Rob,
A careful look at the picture suggests you might have an electrolysis 
problem (galvanic corrosion)...  At least to me, it looks like the 
threads are completely gone where the nut was.  I have to wonder if your 
washer is a different metal, but it does not make sense as these came 
from the factory....   Another condition is something called microbially 
sustained pitting corrosion of stainless steel in anaerobic seawater (I 
understand the problem is the same for 316 stainless, but am not sure).  
My little knowledge of this issue comes from rigging corrosion where the 
threads seal oxygen from the threads thus creating the anaerobic 
condition.  
Did you split the nut to remove it? 
What condition where the threads in the nut?
It appears you stopped once you discovered the problem on the one stub.  
Do you think the others are the same?
I am not an engineer (much less a materials engineer), and I would want 
to consult one regarding what you might expect regarding the quality of 
the overall bolt.  Once that question is answered, you could lower the 
level when you epoxy and use the lower threads, which appear to be in 
good condition.
That is my unprofessional take on this.

Charles Finn
Mighty Quinn #114

or
Rob Cornelsen wrote:
> Any one replaced their Keel Bolts?
>  
> Rob Cornelsen
> Dead Calm Hull #223 1983
>
> ----- Forwarded Message ----
> From: "Mark_Crosby at fpl.com" <Mark_Crosby at fpl.com>
> To: hlhowell at pacbell.net; Catalina 38 Listserve <listserve at catalina38.org>
> Sent: Saturday, September 15, 2007 6:11:52 AM
> Subject: Re: [C38] Keel Stub Wood Removal?
>
> I remember several messages a couple of years ago where two owners on 
> this list had replaced the keel stub. I would check the web site, or 
> hopefully the ones with that experience will chime in.
>
>
> Mark Crosby
> "Fat Cat"
> l
>
>
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