My mechanic suggested I change the size of my thru-hull for the wet exhaust from 1.75" to 2.0". It appears the Sam L Morse company stepped the 2.0" exhaust coming off my 3GM30F down to 1.75" at the water muffler, and continued all the way to a 1.75" thru-hull. I’m really not sure why my boat was built this way, but perhaps someone on the forum could help with the reasoning/history? My mechanic said that Yanmar would not honor the warranty if the 2.0" is reduced at any point from the engine to the thru-hull. At any rate, the warranty is a moot point; however, I would like to ask the forum their opinion on the value of having a seacock located at the wet exhaust thru-hull?
Thanks…
Ahoy Traveler , do you have a copy of Nigel Calder’s book ? Maybe you would like to consult that for more info on your question ?
I also did install a ball valve on my 2" exhaust hose , for the reason , that if I wanted to close off ALL external sea water entries to the hull , I would be able to do that … Many boats sink right at their docks , because the owners did not close their sea cocks , go figure that out , including shaft log drips ,
I remember that Latitude 38 owner sinking his boat at the dock in S F , because the wind shoved water up his exhaust port , and that water siphoned into his engine , which passed his valves and flooded thru his oil dipstick , that power photo boat sunk at the dock in Sausalito , S F , so think things through , there is reason for our “Out Here” Madness !
L O L , we learning all the time , so Much V Good Advice can be researched right here in archives , Keep your questions coming ???
Douglas,
Thank you for responding, it sounds like I need to have a new ball valve installed at the thru-hull. I noted that you have a 2" exhaust hose, which makes the question of why I have a 1.75" even more intriguing. Also, check your private messages when you get a chance.