cause of leak in raw water siphon break - Volvo 2003T
 

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.

Dave
J/40 #63

cause of leak in raw water siphon break - Volvo 2003T
 

I spent a bit more time looking at the problem today and found I could
easily blow air through the hose ("downstream" from the siphon break).
If there's a blockage, it must be slight. Next I'll try pouring some
anti-scale formula into the hose. I would appreciate any thoughts on
what might be causing this.

Dave
J/40 #63

cause of leak in raw water siphon break - Volvo 2003T
 

Dave,

The problem's not likely the hose, but the little valve that's at the top of
the siphon break. If you can, dismantle the siphon break and carefully
inspect the "duck bill" valve, there's probably some scale or buildup
reventing a full seal. The siphon break acts like a one way vale that is
supposed to only allow air to flow into the loop.

Pierre.

"Dave" wrote in message
om...
I spent a bit more time looking at the problem today and found I could
easily blow air through the hose ("downstream" from the siphon break).
If there's a blockage, it must be slight. Next I'll try pouring some
anti-scale formula into the hose. I would appreciate any thoughts on
what might be causing this.

Dave
J/40 #63

cause of leak in raw water siphon break - Volvo 2003T
 

Dave,

I had a similar problem with my standard 2003. It was the small rubber seal
at the top of the valve itself. I replaced it but still had a small trickle
from the top of the valve. In the end I bought a kit from
http://www.yandina.com/NewCatalog.htm for $8.95 and it solved the problem.

Andrew

cause of leak in raw water siphon break - Volvo 2003T
 

Dave,

I tried a new forespar as well but still got an annoying small trickle of
water into the bilge. As I was trying to chase the elusive "dusty bilge "
syndrome, this was not acceptable. After I installed the Yandina fix - no
problems at all. He's a pretty cluey bloke Colin Foster - from what I have
seen around the BBs.

Good luck.

Andrew