Leak, mixing elbow hose, CD27

[Warren Kaplan]

The hose leading from (or away) from the mixing elbow on my YSM8 is leaking. This is on a 1980 CD27. It is leaking right at the end below both hose clamps. Not where the hose connects to the elbow but on the other end. I believe its a water intake hose from the engine because it is attached to a fitting labelled "in". When I turn the engine on water sprays out of the bottom of the hose pretty much around the circumference. The engine was overhauled in Sept '99 and this is a new hose. It looks to me like the hose just isn't long enough because the clamps seems tight enough. I don't see or feel and "splits" in the hose. I just think that since I can see a bit of the fitting below the hose, that the hose was not advanced far enough onto the fitting and therefore the clamp is really not sealing the connection. Here's the problem. That "joint" looks below the water line when compared to some seacocks in the area. I don't think its connected to the outside and I suppose if the "kingston raw water seacock" to the engine is closed I should have no trouble loosening the clamp and fixing the connection. But I'm not sure of that. What I need to know from anyone who has had to fix a leak in that area (either the hose/fitting connection or just a bad hose) does the boat have to be hauled to do it or is it SAFE to remove the hose and work on it with the boat still in the water. Its not a big leak and if necessary I could do a temporary repair with tape and perhaps another hose clamp lower down. I'll do it that way for a while until I can get the boat hauled. But if I can do a proper repair safely while the boat is in the water, that's what I'd like to do.
Thanks
Warren

S/V Sine Qua Non
CD27 #166



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[Bob Miller]

Are you sure that it is on the water intake? If you described it right, it sounds like it is the hose that goes from the (exhaust) mixing elbow (where the exhaust gases mix with the outgoing cooling water) to the muffler and that the fitting on the muffler is leaking. If that is the case, close the intake water seacock and work on the system. The exhaust port on the transom is higher than the water level. If the water "sprays" pretty hard it is probably being driven out of the fitting by the exhaust gas pressure. A water intake hose has a vacuum on it and shouldn't spray like that. Are you sure that you have a muffler? Hope that this helps.

The hose leading from (or away) from the mixing elbow on my YSM8 is leaking. This is on a 1980 CD27. It is leaking right at the end below both hose clamps. Not where the hose connects to the elbow but on the other end. I believe its a water intake hose from the engine because it is attached to a fitting labelled "in". When I turn the engine on wat

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[Warren Kaplan]

Bob,
On further consideration and looking at some diagrams, I think you're right. It probably is the exhaust hose leading away from the mixing elbow. Its pretty heavy guage stuff and the water does spray out of the bottom where the hose meets the fitting in sort of a "pulsating manner". Probably is from exhaust gas pressure. I'm happy to hear this. Looks like I won't have to haul the boat to make repairs. Thanks for your help!!
Warren



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[Mark Yashinsky]

Why should there that much pressure in the outlet of the mixing elbow to cause the cooling water to "spray"??? and from a little Yanmar one cylinder engine??? Is the exhaust downstream plugged or restricted (like a rag fromthe overhaul got blown in to the muffler)??? Check the rest of the exhaust path out, or you might be doing exhaust hose repair again. Watch and listen to the engine after the hose repair, does it sound like its choking while running w/ some throttle??? the exhaust should have very little restriction on it (you can easily blow thru it).

[Warren Kaplan]

Why should there that much pressure in the outlet of the mixing elbow to cause the cooling water to "spray"??? and from a little Yanmar one cylinder engine??? Is the exhaust downstream plugged or restricted (like a rag fromthe overhaul got blown in to the muffler)??? Check the rest of the exhaust path out, or you might be doing exhaust hose repair again. Watch and listen to the engine after the hose repair, does it sound like its choking while running w/ some throttle??? the exhaust should have very little restriction on it (you can easily blow thru it).

Mark,
Engine "seems" to be running just fine (but I'm no mechanic). Good stream of water comes out of the "exhaust port" in the transom. I did a temporarey fix yesterday, with another hose clamp lower down and now it only leaks a little. Too nice a day not to go sailing yesterday on Long Island. I plan to take the whole thing off, from the mixing elbow on down and I will check to see that no obstructions are in the line. I would expected on a one cylinder engine that the exhaust might be pulsating because it is only one cylinder. Exhaust water comes out of the transom "somewhat pulsating" also. As I said, I'm no mechanic but is that "not" the way it should be (assuming no obstruction)?
Thanks for your input.
Warren



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[mark yashinsky]

Is there much exhaust gases coming out w/ the water??? This could be a health hazard is the gases collect in the main cabin. Again, there should not be much back pressure (restriction) out of the engine exhaust. Was anything done just before this started??? You mentioned an overhaul. Thats why I mentioned to look for things like a forgotten rag stuffed into the exhaust hose and blown into the muffler. Just an idea. Have to go section by section and make sure its free and clear. Lastly, are you sure its "spraying" out under pressure and not just dribbling out from a split hose or cracked elbow???

[Warren Kaplan]

Is there much exhaust gases coming out w/ the water??? This could be a health hazard is the gases collect in the main cabin. Again, there should not be much back pressure (restriction) out of the engine exhaust. Was anything done just before this started??? You mentioned an overhaul. Thats why I mentioned to look for things like a forgotten rag stuffed into the exhaust hose and blown into the muffler. Just an idea. Have to go section by section and make sure its free and clear. Lastly, are you sure its "spraying" out under pressure and not just dribbling out from a split hose or cracked elbow???

Mark,
I plan to take the whole assembly apart tomorrow (Wednesday) weather permitting. The overhaul was done in September 1999 and during my early sailing in the spring of this year I didn't notice any problem. Then again a small leak early on I could have missed. The water does come out of the bottom of the hose/fitting connection in a pulsating fashion. A temporary fix of an additional hose clamp at the end of the hose cut the leakage way down but it still pulsates. Plenty of water comes out of the exhaust port in the transom also. It just looks to me like maybe the hose "rode up" from the fitting a little. Probably from the vibration of a one cylinder YSM8 engine. Perhaps the clamps that were on there weren't quite tight enough to prevent the hose from riding up and therefore there is leakage. I don't think this will be a major undetaking ( I hope not anyway). I plan to loosen all clamps. Free the hose. Inspect it for splits, holes, tears, etc. Check for any blockages throughout the system and if all is in order, reseat the hose flush with the bottom fitting and clamp it securely. Same for the other end of the hose that connects to the elbow. Then I'll crank up the engine a see what happens. I'll let you know.
Warren