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Old 10-08-2015, 09:39   #1
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Do you think I should replace this?

I started sealing my chainplates which go through the main deck. I had leaks. I decided to pull them all the way out and do you think perhaps I had better change this one?

Really sobering to find one like this. Unlike a lot of designs, my chain plates aren't bolted to the outside of the hull, but through the deck inboard of the cap rail. In the cabin they are covered with decorative box type affair. Even leaks are not readily seen.
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Old 10-08-2015, 10:27   #2
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Re: Do you think I should replace this?

I would definitely replace that one and all the other chain plates too. You are lucky in this case that you can see the crack. Often a crack like this can't be seen with the eye. These cracks caused by corrosion in stainless steel chain plates are not uncommon and have caused more than a few dismastings.
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Old 10-08-2015, 10:59   #3
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Re: Do you think I should replace this?

I would make new ones with heavier stainless. You already know this one fails. For the leaks you might try flexible epoxy around the holes.
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Old 10-08-2015, 11:08   #4
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Re: Do you think I should replace this?

I'm pretty sure the OP was being sarcastic.

The nice thing about finding obvious failure is that you feel your time is well spent.
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Old 10-08-2015, 12:02   #5
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Re: Do you think I should replace this?

Yikes!
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Old 10-08-2015, 17:41   #6
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Re: Do you think I should replace this?

Yes replace it! The cost of a new mast will Far out cost, the replacement cost of a Chain plate, every time!


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Old 10-08-2015, 17:45   #7
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Re: Do you think I should replace this?

Would a galvanised, heat treated carbon steel chainplate be superior to stainless? Or is the market set up for shiny, replaceable things...
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Old 11-08-2015, 04:36   #8
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Re: Do you think I should replace this?

One thing I have no idea about is the original has a thick area where they put the clevis pin through. It looks like they used 1/4 in stock and then welded a 2 in washer either side at the top. Is that necessary or is the 1/4 or even 5/16 stock good enough? I noticed that all the "stock" chain plates i have seen on the web appear to just use rectangular polished stock.
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Old 11-08-2015, 04:47   #9
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Re: Do you think I should replace this?

Quote:
Originally Posted by bletso View Post
I started sealing my chainplates which go through the main deck. I had leaks. I decided to pull them all the way out and do you think perhaps I had better change this one?

Really sobering to find one like this. Unlike a lot of designs, my chain plates aren't bolted to the outside of the hull, but through the deck inboard of the cap rail. In the cabin they are covered with decorative box type affair. Even leaks are not readily seen.
A bit of rust buster, weld up the crack and ya good to go; hardly an hours work
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Old 11-08-2015, 08:32   #10
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Re: Do you think I should replace this?

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A bit of rust buster, weld up the crack and ya good to go; hardly an hours work
I had actually thought that is a possibility. (That was my first thought). Just didn't want flamed too bad.
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Old 11-08-2015, 09:12   #11
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Re: Do you think I should replace this?

Stainless steel is subject to crevice corrosion in the absence of the oxygen necessary for the creation of the oxidation layer. It is very hard to prevent - there are some extremely expensive types of stainless steel that you could use - you will need to do some research. Or, you could go with bronze.
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Old 11-08-2015, 09:54   #12
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Re: Do you think I should replace this?

Quote:
Originally Posted by bletso View Post
I 8started sealing my chainplates which go through the main deck. I had leaks. I decided to pull them all the way out and do you think perhaps I had better change this one?

Really sobering to find one like this. Unlike a lot of designs, my chain plates aren't bolted to the outside of the hull, but through the deck inboard of the cap rail. In the cabin they are covered with decorative box type affair. Even leaks are not readily seen.
Inboard chainplates inside decorative covers are common in larger vessels.
This particular unit is better replaced than welded (welded area will be weaker than surroundings), and if you go out to a shop for a professional weld it may cost as much as a new unit.
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Old 11-08-2015, 10:17   #13
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Re: Do you think I should replace this?

See the post on crevice corrosion. Read Nigel Warren's great book (http://www.amazon.ca/Metal-Corrosion.../dp/0713678178). Replace those and bed them securely. You may have avoided a big issue.
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Old 11-08-2015, 11:13   #14
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Re: Do you think I should replace this?

Accepting the fact that photo's can be deceiving; ... Is that a 'vee' shaped stress riser at the bottom of the crack in the chain plate? if so, one should determine how that occurred surely, and take steps to make sure it doesn't happen again.
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Old 11-08-2015, 11:32   #15
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Re: Do you think I should replace this?

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Originally Posted by thinwater View Post
I'm pretty sure the OP was being sarcastic.

The nice thing about finding obvious failure is that you feel your time is well spent.
You beat me to it. I was going to say facetious. I hope he is friends with a machine shop.
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