Hello, I am the proud owner of a Catalina 30 built in 1983 with a Universal M-25 diesel engine. For some time, I see water flowing from a pipe at the end of the anti-siphon valve conect to the heat exchanger. This occurs regardless of whether the engine is cold or hot. My question is why the water comes out of the pipe instead of going completely in exhauste. I dare not plug the hose that seems to serve as a vacuum. Thank you to enlighten me! p.s. sorry for my poor english but i'm leaving in Quebec city
Most of the Universal diesel installations I have seen, including our '88, have a small hose that goes from a fitting on the top side of the exhaust injection casting or just before that connection, and goes to a small thru-hull on the transom.
This "pees" out a small stream of water any time the engine is operating. This acts as a syphon break when the engine is shut down.