I just rebuilt my entire exhaust system including the anti siphon hose, through hull, and vented loop/pipe. I used a true tee fitting with a reducer instead of the soldered in pipe bit. http://www.ericsonyachts.org/infoexchange/entry.php?258-Exhaust-Rebuild-E-26
there is no valve in the anti siphon loop system, just a hose to drain the loop and introduce air into the loop to prevent siphon. It must exit transom above heeled waterline in order to function.
There is also some good info from sbmar website : http://www.sbmar.com/articles/designing_a_marine_exhaust_system/
you need a vented loop to prevent siphon flooding of the exhaust and subsequently your engine valves unless your wet injection spillover point is quite allot higher than your exhaust spillover point down stream from the lift muffler.
The transom arrangement of the syphon break outlet over your exhaust is now exactly like the stock scheme on our Olson 34. I might also want to copy your syphon break fitting combo, if ours ever needs replacement -- it looks very well thought out!View attachment 16102View attachment 16103 First picture is my new siphon break with raw water bypass bolted to the underside of the counter next to the sink. The second picture is my transom with the new through hull for the bypass discharge directly above the exhaust outlet.
Let me know if I can post any other helpful pictures.
Come over to the Stainless Steel fitting side...Thanks for the photos. Looks like you put something together with bronze fittings. I will look to do something similar. The marine sail photo kind of confused me, because it looks like he did it all in brass, which I thought you weren't supposed to use in salt water.
I would definitely use the Marelon vented loop. No corrosion or galvanic issues possible with Marelon.Hmm, putting together all these bronze fittings to get this to work is getting expensive and also adding a lot of joints to the system. I'm thinking of just installing a 5/8" Marelon vented loop instead. They have an option of replacing the threaded vent cap with a 1/4" nipple for the hose to the fitting at the transom. Seems a lot simpler. Am I missing something?
I attached a picture of the exhaust valve and elbow installed in my E38. The shutoff valve is a full-flow type and happens to be 2" in diameter. When my exhaust system repair/installation was done in 2004 I was a newbie and I had it done by a shop and they did a good job. It was expensive. The exhaust size was increased from 1.25" to 2" diameter and that meant new everything from the exhaust flange back to the thru-hull. You may not want to go that far if you have the smaller diameter.Hi Everyone,
I was replacing the old, crazed exhaust hose on our E-38 when the iron pipe extending from the bronze exhaust exit elbow sheared off (the bronze elbow is attached to the thru-hull at the underside of the transom and has the funny little nipple soldered to it).
The bronze elbow is a goner - too corroded to reuse.
I'm looking for ideas for a replacement. I'd like to get a sea-valve on that thru-hull so we can close it in following seas (just need to remember to open it before starting engine!). I'm a total newbie on this stuff, so forgive me if the solution is obvious!!
I'll try to post some pictures when I get to the boat later today.