Originally Posted by micheck
I have seen a small (1/2") hose attached where your 'shot' valve is located; the hose is led to a cockpit
drain and spills into the drain - gives you an air vent at the top of the loop and provides a visual on if the exhaust is working
Thanks but not easily workable in my boat. There was from the builder
a hose attached to the vented loop that lead to a small barbed discharge in the hull
right next to the actual exhast but it was not in use when I got the boat. When the vent in the vented loop failed and started leaking seawater onto the exhaust I replaced the broken fitting with a barb and ran a new length of hose but there is no flapper valve in the loop now so when the engine
is running water
is peeing out the overboard
discharge in addition to the exhaust.
Its not an entirely bad scenario running the vent line overboard
like this but the problem is twofold. One: I still should have a flapper valve of some sort in the vented loop and two: I dont like the vent being so close to the waterline. My exhaust discharges from the strbd side just above the waterline so I can envision a scenario where sailing hard on port tack the siphon break could allow water to flow into my exhaust and potentially flood the engine
. My surveyor
recommended a proper vented loop with a flapper valve and a short length of hose that runs to the bilge
so the siphon could always be broken by sucking air.
I dont think I neccesarily need the hose run to the bilge
as long as I have a decent vented loop with a functioning flapper I should not be seeing any leaks
. Afterall these same loops are used in head
discharges and they dont leak sewage.