On our new to us centre cokpit boat, The exhaust
from the engine
enters a custom - made for the boat - water
lock located about 12" down from the heat exchanger
utilizing a 180 degree stainless tube inline along the way to allow it to drop this distance in a small space. It then exits via a short tube at the top of the water
lock which then passes through a bulkhead, msaking an immediate left turn and then running against a bulkhead along the top of the sole and following the curvature of the hull
until it connects to a 1 1/2" through hull
before exiting the boat at a point about 4" above the waterline aft of midship on the starboard side of the vessel. The through hull is fitted with a ball valve.
The long and short of all this is that the total distance the exhaust
rises above the waterline once it exits the waterlock appears to be less than a foot at the highest (and below the waterline for most of the run). This appears to be the original design and it troubles me because I cannot see how other than keeping the through hull ball valve closed when not operating the engine
that water will be prevented from filling the water lock when sailing. Now normally, I would just say that the system is there, it must work BUT the engine in it is new and it is not known what killed the last engine.
Am I worrying for nothing?