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You can check the swaged fittings, on the boat, but you have to remove the chain plates to check them, if they were to fail it would be where they are covered with sealant or the bolts. As a note, the only time I have heard of CR chain plate failure is the ones that had a spacer welded to the top and I think they failed at the horizontal weld. If you do remove them use new 316 bolts.
Breck Caine CR 38 #19
In a message dated 6/5/2012 11:43:56 A.M. Eastern Daylight Time, tc...@aol.com writes:
Thanks for the dye check,one question as the back of the chain plates are not exposed will checking the fromts expose anything going on in the back?I,too wish to remove the chain plates for inspection,however if dye will tell the tale I'll dye it.Dave 52
-----Original Message-----
From: 'alangluyas' <alang...@iinet.net.au>
To: caborico <cabo...@googlegroups.com>
Sent: Tue, Jun 5, 2012 9:15 am
Subject: RE: [caborico] Re: Let the projects begin...
Hi AllGetting cool down here in Tassie - at least we don't get our water freezing up though! I have seen Mickeys photos!I would take off one chain plate for an inspection if it was relatively simple to get at but I would not panic otherwise. If there is a corrosion problem with stainless steel there will be evidence of "corrosion products", ie, rust, either inside the hull or outside. So called "stainless steel" does not appear to corrode because the chromium in it forms a very tough and tenacious oxide layer when it is in contact with oxygen. When you deprive it of oxygen and expose it to chlorides and water, it rusts every bit as fast as mild steel and it makes the same volume of rust. From memory, every 1mm of steel will produce about 10mm of rust. So, your stainless steel chain plates are not going to vaporise away un-noticed. If you have rusty brown stains coming from below and bubbling at the edges, then you have problems. If they are dry and tight, then I would not worry a lot.Brite Star is also 25 years plus (1984 build) and I would probably take the chain plates off and rebed them if I had another reason to strip out the interior. I won't do it just for the sake of it.That does not let you off doing crack inspections and anyone who is inteterested can buy a "dye check" kit for a few dollars. You clean the metal up, spray on a dye penetrant, wipe it off and then spray on a porous white paint-like coating that will suck the dye back out of the cracks and show them very clearly as red stains on the white coating. These are very useful on chain plates, rigging screws and swages. Just be careful with the red dye - if it gets out of control it takes alot of cleaning up!CheersAlanBrite StarCR38 #82Kettering Tasmania
Beck is any particular year the spacers were welded to?
Dave 52
-----Original Message-----
From: Cabo79 <Cab...@aol.com>
To: caborico <cabo...@googlegroups.com>
Sent: Tue, Jun 5, 2012 6:02 pm
Subject: Re: [caborico] Re: Let the projects begin...
You can check the swaged fittings, on the boat, but you have to remove the chain plates to check them, if they were to fail it would be where they are covered with sealant or the bolts. As a note, the only time I have heard of CR chain plate failure is the ones that had a spacer welded to the top and I think they failed at the horizontal weld. If you do remove them use new 316 bolts.
Breck Caine CR 38 #19
In a message dated 6/5/2012 11:43:56 A.M. Eastern Daylight Time, tc...@aol.com writes:
Thanks for the dye check,one question as the back of the chain plates are not exposed will checking the fromts expose anything going on in the back?I,too wish to remove the chain plates for inspection,however if dye will tell the tale I'll dye it.Dave 52
-----Original Message-----
From: 'alangluyas' <alang...@iinet.net.au>
To: caborico <cabo...@googlegroups.com>
Sent: Tue, Jun 5, 2012 9:15 am
Subject: RE: [caborico] Re: Let the projects begin...
Hi AllGetting cool down here in Tassie - at least we don't get our water freezing up though! I have seen Mickeys photos!I would take off one chain plate for an inspection if it was relatively simple to get at but I would not panic otherwise. If there is a corrosion problem with stainless steel there will be evidence of "corrosion products", ie, rust, either inside the hull or outside. So called "stainless steel" does not appear to corrode because the chromium in it forms a very tough and tenacious oxide layer when it is in contact with oxygen. When you deprive it of oxygen and expose it to chlorides and water, it rusts every bit as fast as mild steel and it makes the same volume of rust. From memory, every 1mm of steel will produce about 10mm of rust. So, your stainless steel chain plates are not going to vaporise away un-noticed. If you have rusty brown stains coming from below and bubbling at the edges, then you have problems. If they are dry and tight, then I would not worry a lot.Brite Star is also 25 years plus (1984 build) and I would probably take the chain plates off and rebed them if I had another reason to strip out the interior. I won't do it just for the sake of it.That does not let you off doing crack inspections and anyone who is inteterested can buy a "dye check" kit for a few dollars. You clean the metal up, spray on a dye penetrant, wipe it off and then spray on a porous white paint-like coating that will suck the dye back out of the cracks and show them very clearly as red stains on the white coating. These are very useful on chain plates, rigging screws and swages. Just be careful with the red dye - if it gets out of control it takes alot of cleaning up!CheersAlanBrite StarCR38 #82Kettering Tasmania
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Breck, That's what I figured. The outside of the chain plates will (almost) always look shiny and clean. It's what you can't see that'll bite you. Re the spacer: Mine are double thickness at the top of the plate, where the toggle for the shroud attaches. The rest of the chain plate is single thickness or about 1/4' thick. Is that double thickness the spacer you mention?
Tom
On Tuesday, June 5, 2012 6:02:35 PM UTC-4, Breck wrote:
You can check the swaged fittings, on the boat, but you have to remove the chain plates to check them, if they were to fail it would be where they are covered with sealant or the bolts. As a note, the only time I have heard of CR chain plate failure is the ones that had a spacer welded to the top and I think they failed at the horizontal weld. If you do remove them use new 316 bolts.
Breck Caine CR 38 #19
In a message dated 6/5/2012 11:43:56 A.M. Eastern Daylight Time, tc...@aol.com writes:
Thanks for the dye check,one question as the back of the chain plates are not exposed will checking the fromts expose anything going on in the back?I,too wish to remove the chain plates for inspection,however if dye will tell the tale I'll dye it.Dave 52
-----Original Message-----
From: 'alangluyas' <alang...@iinet.net.au>
To: caborico <cabo...@googlegroups.com>
Sent: Tue, Jun 5, 2012 9:15 am
Subject: RE: [caborico] Re: Let the projects begin...
Hi AllGetting cool down here in Tassie - at least we don't get our water freezing up though! I have seen Mickeys photos!I would take off one chain plate for an inspection if it was relatively simple to get at but I would not panic otherwise. If there is a corrosion problem with stainless steel there will be evidence of "corrosion products", ie, rust, either inside the hull or outside. So called "stainless steel" does not appear to corrode because the chromium in it forms a very tough and tenacious oxide layer when it is in contact with oxygen. When you deprive it of oxygen and expose it to chlorides and water, it rusts every bit as fast as mild steel and it makes the same volume of rust. From memory, every 1mm of steel will produce about 10mm of rust. So, your stainless steel chain plates are not going to vaporise away un-noticed. If you have rusty brown stains coming from below and bubbling at the edges, then you have problems. If they are dry and tight, then I would not worry a lot.Brite Star is also 25 years plus (1984 build) and I would probably take the chain plates off and rebed them if I had another reason to strip out the interior. I won't do it just for the sake of it.That does not let you off doing crack inspections and anyone who is inteterested can buy a "dye check" kit for a few dollars. You clean the metal up, spray on a dye penetrant, wipe it off and then spray on a porous white paint-like coating that will suck the dye back out of the cracks and show them very clearly as red stains on the white coating. These are very useful on chain plates, rigging screws and swages. Just be careful with the red dye - if it gets out of control it takes alot of cleaning up!CheersAlanBrite StarCR38 #82Kettering Tasmania
Sent: Tuesday, 5 June 2012 11:02 AM
To: cabo...@googlegroups.com
Subject: Re: [caborico] Re: Let the projects begin...