Help regarding steam or smoke coming from an exhaust component, time sensitive.. - Page 2 - SailNet Community
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post #11 of 28 Old 02-17-2011
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Theres lots of possibilities listed here but I would have one major concern.
If the fitting fails then there is every chanch you could get water building up in the exhaust and entering the engin which would be a disaster.
I can see you are a competent sailor and are bringing the sails with you but setting out for a 5 hour run without resolving the problem looks dodgy.
Deadlines are often the weak link.
Safe sailing

The great appear great because you are on your knees. James Larkin, Irish Labour Movement.

Last edited by centaursailor; 02-17-2011 at 01:07 AM.
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post #12 of 28 Old 02-17-2011
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This is the result of not winterizing a boat. It belongs to the marina owner who knows better but foolishly wanted to wait a week to winterize his boat. The strainers froze, then defrosted on a warm day and the bilge pump couldn't keep up. It's a 34' Silverton. I'm in the dive gear on the far right trying to get airbags on the stern, water was 38F...
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post #13 of 28 Old 02-17-2011
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Hey, liked the post but why the need for validation?
Pushed the button anyway.
Safe sailing

The great appear great because you are on your knees. James Larkin, Irish Labour Movement.
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post #14 of 28 Old 02-17-2011
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I am familiar with the inside of that water/exhaust mixer.
I agree with Scotty's assessment, however I would make absolutely certain that there is no water getting into the crank case via the exhaust valve.
Dick

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Originally Posted by scottyt View Post
i would check for a hole or crack in the pipe. that upside down u is the spot where cooling water get injected into the exhaust pipe. it is also the notorious spot for corrosion on yanmars. the reason for the water coming out being cold is simple, our water is so cold right now it does not take much to keep the engine cold, most of the water is bypassing the thermostat, thats a good sign.

on a raw water cooled engine its called the mixing elbow, it might be on the fresh water cooling too.

in all honesty run it as it is, but keep the cover off the motor to keep an eye on it, and stay out of the cabin. it might get worse real fast, or make it all the way. either way you are probably getting some carbon monoxide out of the elbow. but be prepared to pay for new parts either way.
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post #15 of 28 Old 02-17-2011
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Exhaust Leak

As has been explained here, you have a leak on the exhaust mixing elbow, it seems. If you have identified the source correctly, this is not a big issue for short term operation of your engine. Your engine will run fine and reliably. However, this is a big issue for the long term health of the engine and your boat.

That leak, even if you can't see it, is exhausting a small amount of seawater and exhaust soot into your engine room. I had a similar problem that went undetected for an undetermined (but relatively long) time. By the time I found it, the resulting corrosion had damaged the aft stbd motor mount stud.

My mixing elbow corroded from the inside out until the elbow wall was so thin a pinhole leak developed.

If your leak is on an accessible area on the side of the elbow, JB Weld is a good temporary fix. If it is on the threads, I doubt the leak can be stopped using JB Weld. Also, you will make the repair a lot more difficult and more expensive because you won't be able to take the exhaust system apart at the elbow joints. Given the age of your engine (some 2GMF parts are hard to find), you might want to carefully consider what other components might be affected before you JB Weld those joints.
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post #16 of 28 Old 02-17-2011
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good luck, fair winds
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post #17 of 28 Old 02-17-2011
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what antifreeze did you use??

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Originally Posted by chrisncate View Post
...

Here is how I winterized her, you tell me if you see a problem - I removed the raw water intake hose at the seacock, stuck it into an antifreeze jug, ran the engine and watched the exhaust thru hull until it ran green with antifreeze.
...
Did you say it ran GREEN with antifreeze?? Isn't the non-toxic antifreeze (propylene glycol) pink?

Don't tell us you ran ethylene glycol antifreeze right into the Bay! You would have killed a lot of fish and other life!
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post #18 of 28 Old 02-17-2011
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Quote:
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Hey, liked the post but why the need for validation?
Pushed the button anyway.
Safe sailing
It was an afterthought w/ the "marina policy/rules" he posted and this guy is the same way.

Newbies reading this thread might not know what can happen and how fast.

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post #19 of 28 Old 02-17-2011
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Chris- hope the trip goes well. I would agree you have an exhaust elbow failing. Keep an eye on it, but it should be fine for this trip.
On another issue from your OP. You were in rough conditions and then the engine wouldn't go above 2500 rpm's. That's a textbook case for a partially clogged fuel filter. The gunk in the tank gets churned around in the rough conditions and then clogs the filter. Change filter(s) and you should have full rpm back.

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post #20 of 28 Old 02-17-2011
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some good answers to the problem by posters . i am a retired diesel mechanic. i would have just tightened the threads & wrapped it like they did and gone. i never run green antifreeze through the sea water side of my yanmar 2GMF 20 . that is what i use in the closed cooling system. if you are going to run antifreeze through the sea water side it should be pink RV antifreeze that is not a poison.

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