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post #1 of 18 Old 12-28-2015 Thread Starter
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shut valve vs anti syphon valve

I have a pilot house motor sailor. The engine is fresh water cooled and the anti syphon valve comes up in the pilot house. The exsiting valve leaks to much for my liking and since it is in the pilot house it can be a nuicance. I am considering replacing the anti syphon valve with a shut off valve. So when I turn off the engine I would manually close the intake pipe to prevent accidentally siphoning water into the engine.
Does anyone see a problem with this.
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post #2 of 18 Old 12-28-2015
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Re: shut valve vs anti syphon valve

Yes. At some point you will forget to open or close. Not if --- when. Just fix or replace the anti-siphon valve.
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post #3 of 18 Old 12-28-2015
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Re: shut valve vs anti syphon valve

Been there, done that, have the receipt for the new thermostat.
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post #4 of 18 Old 12-28-2015
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Re: shut valve vs anti syphon valve

Have you just considered getting a new internals or a new anti siphon valve????? One working shouldn't be leaking.

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post #5 of 18 Old 12-28-2015
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Re: shut valve vs anti syphon valve

I have a pilothouse motor sailor as well. About 1.5 years ago I had a one time failure of my anti-siphon vent (instead of a valve this is designed to "leak") and now, 1.5 years later and 25K later, I have a nicely rebuilt motor.

Proceeded with extreme caution here.

What kind of boat and motor is it?
Is your engine below the waterline?


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post #6 of 18 Old 12-28-2015
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Re: shut valve vs anti syphon valve

Any decent anti-siphon valve is rebuildable. It cost very little to replace the diaphragm or whatever your use.
I had constant trouble with one, years of leaking and cleaning and/or diaphragm replacement. One day I was staring at it and noticed this great big arrow which indicated the direction of flow. Guess what? It was backwards. We turned it around and haven't had a bit of trouble since.
Just because something was working OK on your boat for a while, don't assume the person who installed it knew what he was doing. I know for a fact that this was done by the 'professional' mechanic at Consolidated, on City Island. Makes one wonder what else Consolidated may have screwed up on the boat that I haven't found yet. Please pass me the Rolaids.
Personally, I would NOT replace the anti-siphon valve with a shut off valve. In an emergency it might cause the loss of the vessel. Just replace it if you can't or don't want to try fixing it. A new one should do just fine.

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Last edited by capta; 12-28-2015 at 05:23 PM.
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post #7 of 18 Old 12-28-2015
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Re: shut valve vs anti syphon valve

I had an anti-siphon valve failure while in the Florida Keys three years ago. Fortunately, I caught it before firing up the engine. I decided to change the oil and noticed it looked like light colored chocolate milk. It was half seawater.

Even after purchasing new valve, it still failed to function properly. I ended up modifying the valve spring, making it lighter, and that solved the problem. I don't trust myself to close valve as soon as the engine is shut down, or open it when I fire the engine up.

All the best,

Gary
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post #8 of 18 Old 12-28-2015
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Re: shut valve vs anti syphon valve

Had the engine manufacturer specified and supplied anti-syphon valve fail flooding the engine. Replaced the valve after rebuilding the engine and it failed again. Luckily only had to flush the engine out with the second failure.

Fixed the problem by removing the valve in the anti-syphon 'U', screwing on a 1/4" hose barb, ran the hose as far up the hull as I could and then to a through hull in the rub rail. Fixed the problem permanently, no valve to fail. The through hull only very occasionally dripped water and was not a problem staining the hull.
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post #9 of 18 Old 12-28-2015
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Re: shut valve vs anti syphon valve

Suggestion: Repair or replace / upgrade your anti-siphon valve, etc. If the engine is installed close to or below the water line then consider a heat riser exhaust stack to prevent the possibility of 'back flow'.

The problem with shut off valves in the exhaust system is the extremely corrosive nature of exhaust gases .... and jammed/frozen and always inoperable shut off valves, usually 'frozen' in the open position. Of course, such a valve made from sulphuric/nitric etc. acid compatible metals is a possibility; but, at a humongous cost. ;-)
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post #10 of 18 Old 12-29-2015
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Re: shut valve vs anti syphon valve

Quote:
Originally Posted by roverhi View Post
Had the engine manufacturer specified and supplied anti-syphon valve fail flooding the engine. Replaced the valve after rebuilding the engine and it failed again. Luckily only had to flush the engine out with the second failure.

Fixed the problem by removing the valve in the anti-syphon 'U', screwing on a 1/4" hose barb, ran the hose as far up the hull as I could and then to a through hull in the rub rail. Fixed the problem permanently, no valve to fail. The through hull only very occasionally dripped water and was not a problem staining the hull.
Sounds like a great idea.... until a wasp makes a nest in your rub rail outlet hole. Then voila! Siphon!

Ask me how I know. :-(

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