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 Post subject: Replacing chain plates
PostPosted: 04 Apr 2016 14:22 
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Skipper

Joined: 24 Sep 2013 09:20
Posts: 393
Got my port side plates out over the weekend. The only difficulties were that I took a hole saw to the inside wall of a cabinet for the aft side of the upper to get access. My cabinets are after market (according to the PO) so yours may not look like this, and it may not be something you have to do. I did that rather than start removing trim and pulling the whole cabinet out. May just leave it that way unless the wife catches wind and wants a cover. Also had to bang like heck with a hammer and use PB Blaster to get the upper's bolts out. Corrosion had them frozen in the holes. The chain plates looked pretty good. Worst was the triangular shaped one for the aft lower. It had some cracks. Going to replace them all anyway.

Also, went ahead and removed the bathroom cabinet in anticipation of doing the starboards next.

Anyone ever changed the forestay and backstay chain plates? I just got all new standing rigging and doing all the other chain plates. Pretty much planning on changing them out too I guess.


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Zach Duncan
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 Post subject: Re: Replacing chain plates
PostPosted: 21 Apr 2016 07:21 
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Joined: 24 Sep 2013 09:20
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Think I posted the above after my celebratory cocktail! It's the starboards that I removed first and the port side that I removed the bathroom cabinet for. Got the port side ones off now too. Pictures to follow.

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Zach Duncan
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 Post subject: Re: Replacing chain plates
PostPosted: 21 Apr 2016 07:41 
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Joined: 24 Sep 2013 09:20
Posts: 393
So, I went ahead and removed the port side chain plates as well. I've got three halyards up supporting the mast (I live at the end of protected canal, very little boat movement). All are at a shop being replaced currently. None of mine looked like those scary pictures that you see others post where they have either failed or are very near failure. On both sides, the triangular plate (aft lower) looked worst, with a few hairline cracks starting to show. I probably could have went without replacing the other four, but better safe than sorry, especially after all the trouble to get them out (it's really not that bad). I am going to go ahead and do the forestay and backstay plates after I get these new ones installed.

One thing I did find that is of note (see pictures below). There was a thin piece of trim wood behind the aft and cap shroud plates that had deteriorated due to past water coming in at some point in the life of the boat before I was the owner. It had been found during my initial survey, but we had determined it was trim with solid good bulkhead behind. Well, once the chainplates were removed, I examined it more closely and determined it could simply be pulled out, which I did. I am going to have it replaced with an aluminum backing plate to keep the chain plates in the same place and add strength. I found an old post (link below), where it looks like this has been done on other boats as well. You can also see in the picture below what happens to the chain plate bolts over time as they retightened themselves in their holes, shifted, and bent under load as that piece of trim wood deteriorated. Certainly something that would have become a problem in the long run.

viewtopic.php?f=5&t=894&hilit=backing+plate


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Zach Duncan
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 Post subject: Re: Replacing chain plates
PostPosted: 21 Apr 2016 07:46 
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Joined: 24 Sep 2013 09:20
Posts: 393
Here is a pic of the plates on the deteriorated piece of wood and also what the trim looks like removed. Just a thin piece laminate, I guess? Doesn't seem like the best thing to be there. Also, I think it may be something aftermarket that a previous owner did, but I have a nice pyramid shaped trim that screws into the headliner that covers these chainplates. Probably made because the water damage on the trim piece looked bad, but will also cover my big aluminum backing plate.


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Zach Duncan
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 Post subject: Re: Replacing chain plates
PostPosted: 08 May 2016 10:00 
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Joined: 24 Sep 2013 09:20
Posts: 393
After pic


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Zach Duncan
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 Post subject: Re: Replacing chain plates
PostPosted: 08 May 2016 16:18 
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Joined: 24 Sep 2013 09:20
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Fore and aft plates off. Not too tough, but you do have to get in the anchor chain locker. You can see the corrosion where they are pressed against the hull. Didn't see any visible cracks. All in all they don't look too bad. Replacing them anyway.


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Zach Duncan
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 Post subject: Re: Replacing chain plates
PostPosted: 13 May 2016 14:48 
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Able Bodied Seaman

Joined: 14 Jan 2014 18:32
Posts: 39
Great shots, thank you. on my list of things to do as well.


 
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 Post subject: Re: Replacing chain plates
PostPosted: 14 May 2016 10:22 
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Skipper

Joined: 29 Dec 2006 09:38
Posts: 656
I am not sure I am seeing the same issues with your chainplates that caused you to replace them. The pictures appear a bit blurry on my IPAD, but what I see is a bit of rust on stainless fittings (stainless does rust) which would not concern me. I see some bent bolts which does raises the question of how that occurred--was the bulkhead so rotted that the ordinary loads deformed them? Or did this happen on removal?. You have suggested you had water incursion and I can imagine that if the PO did not maintain the deck seal, the bulkhead could have been rotted and needed some attention, but in my 40 years of boat maintenance, I do not recall that periodic replacement of all chainplates has ever been considered a part of even very aggressive preventive maintenance. A bit of corrosion on stainless does not appreciably weaken it. Major cracks or substantial elongation of holes from loose bolts would be another matter. I have owned my T37 for 25 years and sailed it hard and long distances in the tropics and--though I have kept the deck joint well caulked--never had a problem with chainplates or thought of replacing or removing them. Yes I have removed the head cabinets to inspect them and tried, unsuccessfully, to tighten the bolts--but they were not really loose. Obviously, something is different in your experience.


 
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 Post subject: Re: Replacing chain plates
PostPosted: 15 May 2016 10:21 
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Joined: 24 Sep 2013 09:20
Posts: 393
We're definitely looking at the same thing Velera. Nothing different in my experience from yours. Mostly rust that doesn't concern me except the 2 aft lowers which showed some cracks and pitting. Changed because:
Removed to inspect so might as well put new ones in since had all apart
All other standing rigging replaced so didn't want a hidden weak link
Had the money and the time

I definitely could have:
Replaced the 2 aft lowers
Electropolished all the others and rechecked them, reinstalling any originals I thought were up to par.

The bent bolts were due to the thin piece of trim wood behind the aft and cap shroud plates that had deteriorated and caused ordinary loads to bend them since with the trim piece deteriorated, they were no longer tight. My guess is when the loads torqued them tight again by putting them at an angle, they bent. The bulkhead behind the trim piece has been inspected and does not show rot. I replaced the trim piece with the metal plate. All good now.

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Zach Duncan
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 Post subject: Re: Replacing chain plates
PostPosted: 16 May 2016 08:55 
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Joined: 29 Dec 2006 09:38
Posts: 656
Thanks for the explanation, Zach. I did see a tiny crack on the aft shroud bracket and I would have done something with that. I am thinking that folks should not take water intrusion around any chainplate as just an esthetic issue. I just finished rebuilding a Folkboat that had been left to leak horribly at the deck at the chainplates for years and it caused a structural mess way beyond the chainplates themselves---they were grounded in mush. What I take from your experience is that, if you have leaks and visible water intrusion, better investigate what damage may have occurred by taking it apart. I am a bit surprised that Tartan appears to have put some wood shim material in that place that could rot.

Ray Durkee
T 37 #373


 
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