Imzadi has a bronze Groco siphon break installed. The PO had saved around $400, when converting from the original A4 to the Universal diesel, by cutting corners on the exhaust elbow, hose routing, and the siphon break. Worked fine for 7 years and about 600 hours. Then I came in from sailing without starting the engine and the seawater that had siphoned into the exhaust manifold weeped into the cylinders and froze the rings to the cylinder walls.
When replacing the now useless engine, I decided to follow the installation instructions this time. Westerbeke/Universal calls for a siphon break between the heat exchanger and exhaust elbow, mounted at least 18” above the water line. Because it is between the heat exchanger and elbow, it is pretty much on the centerline of the boat, and mine is attached to the bulkhead at the back of the engine compartment on the 38 mk2. And,, BTW, I don’t see the raw water line into the exhaust elbow as the most likely source of siphoning water into the exhaust manifold. More likely water from the hose and muffler. Again, Westerbeke/Universal recommends that the hose between muffler and outlet have a high point at least 18” above the waterline (and that the high point be near the transom to prevent following waves from filling up the exhaust system). My high point is about 24” up (in the starboard lazarette) just above the muffler and then slopes down and aft to an exit under the break of the transom and 6” above the waterline. Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Patrick Davin via CnC-List Sent: Monday, January 29, 2018 3:51 PM To: cnc-list@cnc-list.com Cc: Patrick Davin <jda...@gmail.com> Subject: Re: Stus-List Vented loop for engine above exhaust elbow? For those that have one, do you know what kind you have? Vetus makes a few - https://www.google.com/search?q=vetus+vented+loop - and there are the Forespar Marelon ones. I read some of the Vetus ones require running a vent line overboard or to a cockpit drain, or they leak water into the boat. Also where do you have it mounted / how high? My mechanic suggested mounting it as high as possible, which means running it up into the stbd lazarette. I'm hesistant about that because our lazarette is jam packed full while cruising (it's our only large storage space).
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