Yanmar water backflow - SailNet Community

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  #1  
Old 08-18-2013
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Yanmar water backflow

This has happened twice within the week. Upon shut down of our 3 cylinder Yanmar, it syphons water back into the manifold, preventing the start of the engine. The first time was a four hour search. Today the diagnosis was much quicker. Both times the boat had six adults aboard and the wet exhaust outlet would have been under water. I don't want to tell all our guests to move to the bow so I can shut down!! I am getting good at sailing in the harbour.
The exhaust line appears to have an upward loop--like a sink drain, but that doesn't stop the backflow. Can a check valve/anti syphon be installed? I recall seeing a flap on the hull of an exhaust outlet-I assume to prevent this issue.

Any help appreciated

Thanks

Kevin Alles
Bayfield 32 Sea Alles
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Old 08-18-2013
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Re: Yanmar water backflow

How high is the loop? Might be that it's high enough normally, but not when the extra load is onboard.
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Old 08-19-2013
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Re: Yanmar water backflow

Check your anti-syphone valve in the loop. There should be one installed
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Old 08-19-2013
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Re: Yanmar water backflow

Thanks for the info. I'll investigate these suggestions.
Kevin
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Re: Yanmar water backflow

On most every boat I've been to the exhaust outflow is above the waterline. IMO if it isn't when you've got 6 people onboard you should re-locate it higher up.
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Old 08-19-2013
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Re: Yanmar water backflow

Do you have the "low rise" or "high rise" mixing elbow? If the former, a change to the later would help. The high rise is a casting that makes a 180 degree turn, with the exhaust entering up and the exiting down.
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