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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #11  
Old 12-02-2011
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Your suspicions are correct. I removed the exhaust elbow today, it's blocked. I have a seperate side discharge hose, water flows from it nicely when I poen that valve. The injection elbow is simply made of galvanized pipe fittings, I should be able to assemble a new one at the hadware store. I'll clean the old one and keep it as a spare. Of course, it took some thought and parts gyration to remove. I managed to break the adjacent fuel return line. Then a starling crapped right down the back of my neck. (I have a deck hatch to the engine space) I guess that's good luck (both).
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  #12  
Old 12-02-2011
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Quote:
Originally Posted by WanderingStar View Post
Your suspicions are correct. I removed the exhaust elbow today, it's blocked. I have a seperate side discharge hose, water flows from it nicely when I poen that valve. The injection elbow is simply made of galvanized pipe fittings, I should be able to assemble a new one at the hadware store. I'll clean the old one and keep it as a spare. Of course, it took some thought and parts gyration to remove. I managed to break the adjacent fuel return line. Then a starling crapped right down the back of my neck. (I have a deck hatch to the engine space) I guess that's good luck (both).
Great news. An easy--'though evidently crappy--fix. (Unless, of course, that was a Bird of Paradise!) Hopefully you are a young man so that you can enjoy the benefit of this experience for a long time.

Take care, keep well, and good sailing(/motoring?)
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  #13  
Old 12-02-2011
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Early middle age, but young at heart, I hope.
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Old 12-03-2011
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Good news on finding the exhaust mixing elbow. Problem (nearly) solved.
Any pics of buildup in the old fitting?
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Old 12-04-2011
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Sorry Caleb, I lack computer skills, and a digital camera! The deposit was like gritty brown mud, but hard enough in spots to be difficult to scrape out with a screwdriver. I'm going to try boiling it out. The zinc may have added to the problem. It left room in the pipe-t where it was installed, but was long enough to nearly obstruct the pipe nipple screwed into the other end. I cut the zinc in half. A test run now showed plenty of water from the exhaust. Then I reassembled it with sealant. Now I just hope that when I run it tomorrow it doesn't drip.
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Old 12-04-2011
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Originally Posted by WanderingStar View Post
Sorry Caleb, I lack computer skills, and a digital camera! The deposit was like gritty brown mud, but hard enough in spots to be difficult to scrape out with a screwdriver. I'm going to try boiling it out. The zinc may have added to the problem. It left room in the pipe-t where it was installed, but was long enough to nearly obstruct the pipe nipple screwed into the other end. I cut the zinc in half. A test run now showed plenty of water from the exhaust. Then I reassembled it with sealant. Now I just hope that when I run it tomorrow it doesn't drip.
Perhaps I'm just dense but I do not understand the need of a zinc in a mixing elbow. A zinc might be important where there is constant exposure to water but the mixing elbow generally only has water in it when the engine is running. Why then a zinc?
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Old 12-06-2011
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The raw water system should be protected by zincs. Many heat exchangers have one, mine doesn't. There is a zinc in the transmission where seawater first meets steel. There is one at the other end of the sytem where the seawater goes into the exhaust. I think this makes sense, the exhaust zinc shows some decay. I also think that the water stands there all the time, unless the system is drained. Of course, I could be wrong. But I don't change anything that seems to work.
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Old 12-08-2011
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Originally Posted by WanderingStar View Post
The raw water system should be protected by zincs. Many heat exchangers have one, mine doesn't. There is a zinc in the transmission where seawater first meets steel. There is one at the other end of the sytem where the seawater goes into the exhaust. I think this makes sense, the exhaust zinc shows some decay. I also think that the water stands there all the time, unless the system is drained. Of course, I could be wrong. But I don't change anything that seems to work.
If it "ain't" broke, don't fix it (of course). We evidently have a slightly different system on a 4-108 which does not have a zinc in the mixing elbow, hence my question. On our engine, unless it's running, there is no water in the mixing elbow although the heat exchanger does, of course, retain some water. N'any case, I'm glad you were able to get things working properly again.

Cheers...
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Old 12-09-2011
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Probably because the engines, while quite similar, have very different exhaust sytems.
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