leak from engine raw water siphon break - SailNet Community

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Old 08-10-2003
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leak from engine raw water siphon break

I noticed recently a slight trickle of sea water from the direction of
the siphon break in the raw water line. Today I was able to
disconnect the mount from under the sink and pull intact the siphon
break and both hoses out where I could see what''s happening. When the
engine is running there is a continuous flow (more than a drip but not
much more) of water coming out the actual siphon break itself. I
would think the only way this would happen is if there were a blockage
of some type "downstream" of the break. FYI, there''s plenty of water
coming out the exhaust and the engine runs relatively cool. I
disconnected both hoses and did not see any scale or build-up, and the
siphon break fitting itself is clear.

Any thoughts on why this is happening? It has not always been this
way, as the drip falls onto the engine and evaporates, leaving a
clearly visible salt residue that''s a recent happening.
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Old 08-10-2003
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leak from engine raw water siphon break

I had the same problem with the siphon break on my generator. The break was a Vetus siphon break. The problem was that the ball that is pushed up when the exhaust water is flowing freely had jammed allowing much of the exhaust water to flow through the "overflow" rather than through the exhaust. Although there appeared to be plenty of water going overside through the exhaust water outlet the generator overheated after running for some time.

Have a good look at the "divert" mechanism in the siphon break and make sure it is operating freely.

Lood luck,

Robin.
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Old 08-11-2003
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leak from engine raw water siphon break

Thanks for the idea, Robin. I guess I had a naive view of what''s inside the siphon break itself and didn''t even consider it could be the problem. Funny how assumptions cloud one''s mind when solving a problem. I''ll dismantle it and have a look at the mechanism.

thanks
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