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Old 23-03-2015, 04:08   #1
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Anti-Siphon valve

Hi fellow Yachties,
I'm repowering our Roberts Mauritius 43' with a FIAT FNM 60. Can some one tell me do I use the anti-siphon set-up that was on the YANMAR or is there another system for the FNM? It was my lack of knowledge about the anti-siphon valve that caused our Yanmar to seize up with raw water. (YANMAR 4JH2E Parts for sale)
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Old 23-03-2015, 06:13   #2
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Re: Anti-Siphon valve

The anti syphon usually goes between the heat exchanger and exhaust injection elbow. The anti syphon obviously needs to be higher than the waterline. The problem with anti syphons is that the valve can clog causing flooding of the engine. A great idea is to use a "pisser" - this replaces the valve with a small hose that exits high - like the cockpit - and both acts as a syphon break and indicator of raw water flow.

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Old 23-03-2015, 10:21   #3
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Re: Anti-Siphon valve

2nd that, filled the engine on my old boat twice before dumpig the AS valve and running a small diameter hose overboard from the former AS valve system.
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Old 23-03-2015, 18:01   #4
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Re: Anti-Siphon valve

Thank you very much. I need a slapping. I did a very stupid thing. I'm too embarrassed to say. So the same A/S set up will be OK for the Fiat?
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Old 23-03-2015, 18:04   #5
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Re: Anti-Siphon valve

Yes. If you use the anti-siphon valve put it on your maintenance schedule list to remove and wash and inspect before replacing it.
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