Exhast Leak / Wrap Material? - SailNet Community

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Go Back   SailNet Community > General Interest Forums > Gear & Maintenance
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Old 04-30-2007
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Exhast Leak / Wrap Material?

I think I have a exhaust leak, my exhaust is wraped with a white kind of 2" wide cloth. Here is a Picture...


From the discoloration in the wrap I think the leak might be there. If I take the wrap off the exhasut pipe is not solid it looks like a braided wire mesh maybe some type of flex.

I was thinking of using that stuff called Rescue tape Rescue Tape Self-Fusing Silicone Tape ~ The Ultimate Multi-Purpose Repair Tape! says it works up to 500 deg. Any tips?

Scott
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Old 04-30-2007
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Flex pipe sucks!
I haven't used that brand of tape, but have tried others. In my experience they all produce very foul smelling (and probably toxic) fumes...even if they are rated for high heat. Some smoke quite a bit too...it smells VERY bad.
An even bigger issue though is the locatioin of your exaust elbow on the engine. Cooling water is sent through the engine and out the exaust....if the leak is after the elbow it could flood the boat. From your photo though, it looks as if the coolant flows in that tube above the exahust pipe. Is there some sort of backflow prevention so it doesn't go back towards the engine?
My guess is that there IS water in there and it contributed to the degredation of the flexpipe.
Also....be careful with the muffler wrap cloth. Most of them contain crysalized silica which is VERY bad for your lungs.
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Old 04-30-2007
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cardiacpaul is a jewel in the rough cardiacpaul is a jewel in the rough cardiacpaul is a jewel in the rough
just be a bit careful taking that stuff off... depending on the age of the tape, it may just be asbestos.
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Old 04-30-2007
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There really should be a hump in that piece. If its leaking exhaust gas I would think the stain would be more black Might just be rusting under the wrap that stuff will hold moisture. Does the pipe turn down on the other side of the bulkhead? there looks like some newer pieces in that system the nipple at the exhaust maifold looks new. and the water inlet looks more recent also.
what is directly above the pipe, can water drip down on it? Wen you took the wrap off was there a lot of soot staining or rust on the flex.
Could be that that part of the exhaust was redone and they reused the old wrap. the lack of black soot staining leads me to believe it is not leaking exhaust gas. but Iwould want to know for sure.
hope this helps
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Yes on the other side of the bulk head the pipe does go down and then back up in a big loop before it exits the boat. I was guessing that was the source of the leak as I can't find one anywhere else. I can't visually see a leak anywhere I just know there is one since the CO2 detector goes off when we motor and it goes off much less if i let the blower run while motoring.

Scott
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It could be exhaust backdrafting into the cabin. That is a pretty common problem on many boats. How do you know it is an internal leak??
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The cloth covering is insulation. This is the section that is high temp as it is before the cooling water injection. I cannot tell if it is cast iron but many of these fittings are. You should remove the cloth and inspect the piece for corrosion and replace it if necessary and then wrap with new insulation material.
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I guess I am not sure if its back drafting for not but I assume it now since the CO2 sensor does not go off near as much when you run the blower while motoring. I am gathering that the wrap does not provide any type of sealing effect on that pipe? can you check for a exhaust leaks with soapy water before the motor warms up?

Scott
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Old 05-01-2007
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Ok well maybe this well help this is the sensor that is going off S-2A Propane and CNG Fume Monitor and Control from Fireboy-Xintex, it only happens while motoring and the propane valve on the bottle itself is shut off. It goes off and we just press alarm silence and then it goes awhile then goes off again. So its not even a CO2 detector its just a propane thing.

Scott
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I believe diesel exhaust fumes can set off the Propane and CNG fume detector you have... you may want to contact Fireboy and double check that.
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