Re: Onan Generator Exhaust thru hull

Ron Hynes <riffhynes@...>

For what it’s worth, I have a 1976 Amel Meltem and the generator and engine exhaust are combined into a fiberglass “Y” that is fiberglassed into the hull and exits on the port side just above the waterline. I am in the process of re-powering and the new turbo charged Diesel requires a 3 inch exhaust. Since I no longer have a generator, I plan to cut out the “Y” and glass in a new 3 inch tube. I like the idea of a flap on the exhaust to prevent backflushing sea water into the engine and may employ this. The former owner destroyed  two engines when sea water entered the engine from following seas, once across the Pacific and then again across the Indian Ocean before putting in a ball valve. I never liked the ball valve since it reduced a minimally sized exhaust by about 30%. Probably explains why I am on my third lift muffler due to excessive pressure caused by the restriction of the undersized exhaust.

Ron Hynes

On Jul 30, 2021, at 11:57 AM, Ruslan Osmonov <rosmonov@...> wrote:

Hi Richie, 
I think Amel did it on purpose. Hot salt water will corrode metal pretty fast and if you go with metal you it will become constant maintenance/replacement issue. 
after all it served you for more than 20 years 🙂 without much maintenance on your side. 
I would look into either doing the same, or look at what Amel did later with 54s as they added a flap to prevent back flow (per my understanding). 
Another option to look into things like marelon or other non corrosive seacocks, that can deal with heat.

(in search of one)

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