Cracked Flange -What Would You Do? - SailNet Community
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post #1 of 30 Old 03-17-2020 Thread Starter
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Cracked Flange -What Would You Do?

This is just a "what would you do" and in the end I am going to do what I decide is best for now.

I'm in the Bahamas on way slowly to the Caribbean. The other day after shutting off the engine there was an "odd" smell so I checked the engine. The only thing at time I found was there were salt deposits that hadn't been there and I thought maybe a hose clamp was loose or a hose was leaking so checked for all those. Later while motoring I rechecked and found that there is a crack on the engine heat exchanger seawater outlet flange (the one that sends the water over to the the exhaust elbow).

So I looked for a way to clean it up and seal it as best as I could. Now this would seem to be a JB Weld job, but I don't have any of that. I have regular 2 part epoxy and various caulk type sealants. I was going to go the epoxy route but decided that this leak was a low pressure leak in nature. In looking at the choices I had available I decided to go with this West Marine 8600 sealant adhesive as it is super sticky and dries to be almost a plastic.

This seems to have worked and I have motored 6 hours now with it not dripping any water.

Now I'm near Nassau so this is the best I'm going to find to be able to do a better solution till the Dominican Republic. I feel the choices are:
1- replace with an OEM flange. The best answer I feel and probably $$$.
2-find a machine shop to make a new one. The OEM appears to be some type of nickel/bronze/SS as it isn't magnetic. Over the years I've read good and bad stories or shops making things like this
3- find a good shop to weld/braze the crack. To me the risk of this is goes back to the metal material and the danger that it will stress the flange to just fail later in middle of nowhere
4 - continue as I am with the 8600 that is working and I have more of till I can do #1

So, what would you do?

Don't blow air up my rear, be useful and blow it at the sails!
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post #2 of 30 Old 03-17-2020
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Re: Cracked Flange -What Would You Do?

First thoughts...
Good welding shop to repair and build up what you have now
Source new hx

Should be able to bypass duty fees with a part needed for transit, like yours
Might be time consuming getting it out of customs...
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post #3 of 30 Old 03-17-2020 Thread Starter
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Re: Cracked Flange -What Would You Do?

don't need a new HX, just the flange

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post #4 of 30 Old 03-17-2020
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Re: Cracked Flange -What Would You Do?

Maybe a picture or schematic of this would help, but I'm assuming it is a low-pressure, low-temperature part?

If so, weld/braze often works permanently, and many have gone forever on a JB weld type fix.

I definitely would not be doing any machine shop stuff in Nassau.

So I would keep going as is, but pick up some JB weld in Nassau because if the other stuff fails, I think that is a better bet. Then I would price the new part and if it isn't onerous, buy new. If eye-popping price, when someplace with a metal guy I trusted, I'd get it brazed/welded.

And ALWAYS keep JB weld on board.

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Re: Cracked Flange -What Would You Do?

Show flange pic
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post #6 of 30 Old 03-17-2020
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Re: Cracked Flange -What Would You Do?

From the description of the metal and where it is being used, I believe it is monel. I believe it requires TIG welding and even at that, it isn't the easiest metal to weld.
If you can't find a shop that has an experienced TIG welder in Nassau, I'd probably go for a new flange, rather than taking a chance of another failure at a more inconvenient time.

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post #7 of 30 Old 03-17-2020
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Re: Cracked Flange -What Would You Do?

If it's a copper/bronze I'd get it brazed, Any decent refrigerator guy could do it .P.icture would help .May recquire a bit of finesse if the machined gasket face is involved but doable (file) Gets much more tricky if we are talking about the body
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post #8 of 30 Old 03-18-2020 Thread Starter
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Re: Cracked Flange -What Would You Do?

Not really looking for how to “fix” my problem as i know the only real way to fix it. This thread is really just a “what would YOU do” in the conditions and choices listed.

And it is hard to just disregard the “caulk” answer given it has worked for like 6 hours engine run time and isnt likely to just fail.

Btw that crack goes through the flange area and down toward one of the hose connections. Even if it cracks all the way it isnt going to just fall apart as most of it would have the hose on it and be clamped together.

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Last edited by Don L; 03-18-2020 at 08:50 AM.
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post #9 of 30 Old 03-18-2020
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Re: Cracked Flange -What Would You Do?

Quote:
Originally Posted by Don L View Post
And it is hard to just disregard the “caulk” answer given it has worked for like 6 hours engine run time and isnt likely to just fail.
What is West Marine 8600 sealant adhesive? I don't see it on their website and it doesn't come up in a google search. Did you mean 5200?

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post #10 of 30 Old 03-18-2020
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Re: Cracked Flange -What Would You Do?

Don,
I heard on the net this morning that the DR isnt allowing new entries for 15 days, which could change.
Take a look
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