I have read ( I haven’t seen it personally) that if you are sailing for long 
periods in following seas (e.g. ocean crossings), you may want to have a shut 
off valve installed on the exhaust hose. Some people reported that despite the 
high point in the hose, the sea water eventually filled up the muffler and then 
made its way into the cylinders causing a water (hydro) lock. Not a fun task to 
do when you are approaching your destination.

Marek

From: Rick Brass via CnC-List
Sent: Monday, January 29, 2018 20:04
To: cnc-list@cnc-list.com
Cc: Rick Brass
Subject: Re: Stus-List Vented loop for engine above exhaust elbow?


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<https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.google.com%2Fsearch%3Fq%3Dvetus%2Bvented%2Bloop&data=02%7C01%7C%7C5e818bdb18e14e2f43ba08d5677d6bb0%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636528710724185314&sdata=hr2byCd2EFJt7xyMKMxp7e8biuKIn%2Fsy5VqmbBjfW7g%3D&reserved=0>
 - 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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