I have a moody 41ac with a Volvo
. Recently rust stains have appeared on the hull
below the exhaust
outlet and there is a rust tide mark in the outlet tube coming from the Vetus anti-syphon valve (photo).
The boat is only 18months old and I'm concerned that seawater is feeding back into the engine
when the boat is heeled to starboard. I've also noticed that when the engine is running there is a lot of air coming in through the anti-syphon valve on its outlet side, is this connected to the problem or is it normal?
The anti syphon valve is mounted above the engine and the rust tide mark in the outlet tube is roughly level with the top of the engine.
I am pushing the manufacturer for an answer but any suggestions on the probable cause would be welcome.