Hi Dave, Thanks for your advice. Did you notice water drainage from the holes you bored? What did you use to inject it fully? Also have you done anything to mitigate the issue at the top of the keel bolts? I assume this is where the intrusion is occuring.
Regards, Gene On Thu, Jul 21, 2016 at 9:25 AM, Dave Syer <syerd...@gmail.com> wrote: > Gene, Jake, > > Unfortunately this is not so unusual, at least here near Toronto where > things freeze solid in winter. > > I first noticed this in the fall where I saw one 33-2 in the repair yard > adjacent to our marina that had it so bad that the keel had cracked around > the bolt head and a palm-sized chunk of lead had levered away from the > casting by over 1/8". This piqued my curiosity, I checked mine carefully, > and I noticed a slight bulge on one side, at the head (base) of the second > (iirc) keel bolt. I walked around the marina and saw several C&Cs of > similar vintage (mid 80's) with various stages of this problem. I > photographed them all. > Mine was quite mild, but when asked the aforementioned local yard quoted > me a large sum to repair, but declined to tell me exactly what they would > do. The yard stated that the keelsmith used crappy lead, full of > inclusions and voids, and this contributed to the problem in boats of this > vintage. > I called the keel-smith, Mars Metals, and they advised that this was a > known issue in freezing areas, and was caused by poorly maintained keels. > They proposed keel detachment, heating and reforming the lead in the > subject area. Can't recall the price, but large. > > The problem is, as you can probably imagine, water migrating down the keel > bolt and filling any voids in the casting, then freezing. Bigger voids, a > bigger problem, and embiggened with each freeze thaw cycle. > > I ground mine fair, bored a few small holes along the hairline cracks I > saw and injected some epoxy to occupy any voids. I built up epoxy and then > interprotect over the surface. At the time I was doing keelwork, so I > took care to bed and seal well, and further, I glassed and epoxied over the > length of keel/hull joint, and faired that. I doubt I'll have (or have > had) a problem with it in my lifetime, but I would certainly not ignore it. > > Dave > > > > > Message: 4 > Date: Wed, 20 Jul 2016 20:57:19 -0400 > From: "Jake Brodersen" <captain_j...@cox.net> > To: <cnc-list@cnc-list.com> > Subject: Re: Stus-List Keel bulge around near keel bolt > Message-ID: <023b01d1e2ea$d51590c0$7f40b240$@cox.net> > Content-Type: text/plain; charset="utf-8" > > Gene, > > > > This is certainly an unusual problem, at least for this list. I can think > of two things that might cause the bulge, water intrusion or rust. This > may be a combination of the two. There is certainly something going on > around the keel bolt. Drilling into the cavity may reveal the cause. In > any case, holes are easy to fill. Time for some exploratory surgery. > > > > Jake > > > > Jake Brodersen > > C&C 35 Mk-III ?Midnight Mistress? > > Hampton VA > > > > > > > > From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Eugene > Fodor via CnC-List > Sent: Wednesday, July 20, 2016 12:26 > To: cnc-list@cnc-list.com > Cc: Eugene Fodor <efo...@gmail.com> > Subject: Stus-List Keel bulge around near keel bolt > > > > Hi There, > > > > I'm looking to get some opinions on how to treat some bulging around one > of my keel bolts. It is symmetrical and I believe it is from a small amount > of water intrusion around the bolt and then freezing during the winter. The > recommendation from the marina was to drill holes into the bulge and drain > and then fill with epoxy and hammer it in so that it drives deep into the > gaps. And then remove the keel nuts in the bilge and epoxy around the bolt > base to fill any gaps and prevent further intrusion. > > > > Anyone else have this problem? What did you do and was it effective? > > > > Thanks, > > > > Gene Fodor >
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