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Old 06-18-2015, 05:14 PM   #1
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Default Melted exhaust hose

This happened the other day on ,y way back in, fortunately I was only about 1/2 mile from my slip, so I was able to limp her home. The white cloud that came out from the combination of burning rubber and steam from the water pumping out onto the hot engine was pretty alarming. When I bought the boat last season I was told the manifolds and risers were 2 years old. Trying to make sense of what happened, I contacted the previous owner, who contacted the owner before him. Well it turns out these things are more like 6 or 7 years old! Being a salt water boat, I have no idea how they lasted that long. And I wish I knew that so I could have changed them in the off season

Anyway, I sure hope more serious damage wasn't done anywhere. Am I correct that this is a job that can be done with the boat in the water?

Why would this hose melt and not the top one?





The plugs on the manifold look funky too



Thanks for any input
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Old 06-18-2015, 05:15 PM   #2
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The temp gauge never went above 170 either
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Old 06-18-2015, 05:41 PM   #3
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I cannot see the pictures as my work firewall is blocking them. The hose will melt is not enough raw water is being mixed into the exhaust stream in the riser. This happens when they rot and clog.

5 - 10 years is life depending on salt level.

Helm gauge only shows engine temp which is why I use a hand held IR temp sensor and take measurements at the beginning of each season.

Beside hoses the flapper and exhaust bellows can be damaged.

repairing in the water can be done but if the top of the Y-pipe is below the water line water will come in and plugging it off while working is required. if to far below the water line best to pull the boat.
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Old 06-18-2015, 06:41 PM   #4
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I wouldn't be surprised if the flapper was damaged, but there was water still pumping out, so maybe I'm lucky. If the top of the y pipe was below the water line, wouldn't water be leaking in from this new hole already?
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Old 06-18-2015, 09:26 PM   #5
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Quote:
Originally Posted by Intern8tion9l View Post
I wouldn't be surprised if the flapper was damaged, but there was water still pumping out, so maybe I'm lucky. If the top of the y pipe was below the water line, wouldn't water be leaking in from this new hole already?

Yes but since I cannot see the picture I cannot say 100% what you have.
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Old 06-19-2015, 03:39 AM   #6
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I can see your pictures on my iPad.

It does not look like the hose has burned thru so I would still be careful about water entering when removing.

Looks like torques heads on the plugs, never seen these before.
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Old 06-19-2015, 11:00 AM   #7
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A decent amount of water was pumping into the bilge when the engine was running from around those top hose clamps. That grey wire you can see on the lower left of the pic is about 5" below the water line, so I'll have to get a level and see where I stand
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Old 06-20-2015, 12:07 PM   #8
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I'm between Sierra and Barr right now...Internet reviews are kind of all over the place, except a pretty unanimous no to GLM. Any experience with either?
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Old 06-20-2015, 03:32 PM   #9
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I just did mine with sierra. Did it in the water, but I didn't have to remove that lower joint on mine.



These plugs from home depot fit the 4" rubber couples up top perfectly. I don't know if the lower couplers are the same size.
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Old 06-20-2015, 03:42 PM   #10
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Thank you both. I was also thinking something like this if needed:



Not sure if that's showing up...it's one of the black rubber PVC caps that goes on the outside of the pipe and secures with a worm clamp
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