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Old 12-11-2011, 17:30   #1
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Join Date: Nov 2011
Location: Bellingham Washington
Boat: Fraser 41
Posts: 4
Volvo Penta 2003 Anti Siphon Valve

Hi All,
I have a question concerning the placement of my anti siphon valve for the raw water injection hose that goes into my exhaust on my Volvo Penta 2003 diesel. My motor is raw water cooled and only has 200 hours on it. It was built in 1984 but the boat was just commisioned this August. There was no anti siphon valve on the boat so I bought a Vetus anti siphon valve. On this motor there is a copper tube that goes from the rear of the head into the side of the exhaust elbow. I made an assumption that this is the water injection site into the exhaust so I cut this tube in half and then installed the anti siphon valve. I was able to postion the valve so it is approximately 2 feet above the waterline. I have noticed that when the boat sits for a few days and the motor is started a huge column of water comes out my exhaust . It shoots out maybe 10- 15 feet behind the boat. I am concerned that if the boat sits idle long enough the water will eventually fill my muffler and then enter the motor. In order to see how much water was coming from my engine I disconnected the exhaust hose from the inlet side of the muffler and let it drip into a 4 quart size pan ( My wife loves it when I use her kitchen pans for engine work! ). Anyway I got at least 4 pans full of water so 4 gallons or so in a couple of days and it still seemed like it was dripping. I checked the siphon valve and it is working fine. I checked to see if raw water was somehow coming into the motor through my water strainer but it was fine. Is the anti siphon valve placed in the wrong spot? Could all this water be just the block draining? I am not sure how this could be the case since the inection point is at the top of the engine but who knows? I forgot to mention that my boat is a sailboat. Any ideas would be greatly appreciated.
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