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rjg23 08-23-2010 03:43 PM

Vented Loop
As I replace the exhaust system on my ysm8 it previously did not have a vented loop. There is a 5/8" line from the thermostat to the mixing elbow where the vented loop would go. I can't seem to find one for a 5/8" line that I have currently. Any suggestions on where to find? I have seen the Vetus but am not interested in venting that exhaust thru the hull. Can any old vented loop work?

Gene T 08-23-2010 03:54 PM

Are you saying your exhaust is 5/8"? If so that is too small and would cause engine problems like burnt valves.


fawcettm 08-24-2010 08:48 AM

You know what is nice about venting through the hull, you dont have to lean over so far to check for water coming out of your exhaust, I had a check value on an old vented loop, but it got stuck and took out my regulator below it. Since I put the new line and loop from vetus, I havent had any problems.

mitiempo 08-24-2010 10:39 PM

1 Attachment(s)
The vented loop is in the raw water injection line before it goes into the exhaust elbow, like the Yanmar diagram below. As it says an anti-siphon or vented loop. Some install a vented loop with a small hose from the top into the cockpit well as it will not clog. And a bit of water spitting out is a comforting thing to see.

Gene T 08-25-2010 05:30 PM

Ah, that makes sense, I misread the original post.


SeaFever2000 08-25-2010 11:33 PM


I would try Discount Marine and Boat Supplies - Inflatable Sales - Defender. They have a good selection of the Marelon type vented loops and the prices are also reasonable. I got mine from them. Depending on where you are located, you could also find it in your local marine store such as West Marine...

Hope that helps.

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