Originally Posted by Mikentosh
Then engine is not installed yet, we know how it should be installed all designs show the engine and exhaust above the water line. That is not possible in this boat. At this point Yanmar suggests going with a larger exhaust tank to hold more water to mitigate the problem but it's only a bandaid. We might also extend the exhaust riser and make it a little higher but still under the waterline. This is really a boat design issue that maybe back in 1977 when the boat was made they didn't think about this.
Many engines are below the water line.
As far as exhaust is concerned:
- loop the exhaust hose up under the stern coaming or in the lazarrette. Then down to the exhaust fitting. This will also prevent any wind
waves hitting the stern at a dock
from gradually filling the exhaust.
-If there is any room under the cockpit
you can also make a riser coming off the exhaust at the engine, looping up to the underside of the cockpit
floor, and then down to the waterlift muffler
. This can prevent any water from a long exhaust hose from coming in.
-Calculate the water in the exhaust hose from the muffler
to the stern loop and buy a waterlift muffler big enough to house that volume of water. Realistically, it usually comes down to the largest that fit's in the limited space you have. With the stern loop this really doesn't matter.
All basic stuff and done often.