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Subject: Re: [world-cruising] Keel Bolt Repair
From: Desmond Smith (tropicislemacaws@XXX.XXX)
Date: Wed Feb 12 2003 - 18:08:23 EST
Stainless steel is great in air but will not fair well underwater deprived
of oxygen. My understanding is that iron bolts hold up better in wet keel
applications.
You need to research this more thoroughly before making a decision.
Desmond Smith
----- Original Message -----
From: "Baumgart, James" <james.baumgart@XXX.XXX>
To: <world-cruising@XXX.XXX>
Sent: Friday, February 07, 2003 1:31 PM
Subject: [world-cruising] Keel Bolt Repair
>
> My 1978 Catalina 25 passed survey with good marks, EXCEPT ALL the keel
bolts
> are rusted away to nubs. The surveyor hit them with a small hammer and
they
> fell apart to dust. The nuts are gone entirely and the bolts themselves
look
> totally rusted, about 3 inches long, and the diameter of #2 pencils - they
> are way too small and wasted to be re-threaded to take smaller nuts.
>
> On the Cat 25, while not encapsulated, the fixed keel is heavily glassed
in,
> and is made of iron. The old bolts (now studs) are glassed in and still
> holding the keel tight. There is not a single sign of keel separation on
> the bottom.
>
> The bolts can be "sistered". A special drill press machine will be used to
> drill new holes alongside the old bolts, the new holes will be threaded,
and
> 5 to 6 new 3/4" bolts will be screwed into the keel. These should be
able
> to be inserted through 3 inches of glass and into about 2 1/2 to 3 inches
of
> iron.
>
> The job can be done in the water and I got an estimate $900 to do it from
a
> professional keel repairman. The deal is that the current owner must do
the
> repair and then I will inspect and if it's good, I will let my (full
price)
> offer stand. The surveyor will pass the boat if this is done.
>
> What do you think of this repair and is there any special instructions for
> preventing galvinic corrosion in the keel or on the new bolts?
>
> It's a cast iron keel (good thing, lead would be unrepairable). Should
the
> new bolts be 316 stainless or mild steel?
>
> I am thinking of covering the bottom of the keel well with epoxy or some
> other sealant to keep the bolts dry in the future. The boat is normally
> bone dry, but every time you remove the knotmeter for cleaning a lot of
salt
> water comes in and ends up sitting in the well. What would you do to
> protect these bolts? Grease? Sealant? Epoxy?
>
>
>
> [Non-text portions of this message have been removed]
>
>
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>
>
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