View Full Version : 2 cylinder inboard yanmar engine

02-06-2011, 07:18 AM
Just gone to start my engine after the cold spell and have water spouting out of what looks like a by pass vent its a pipe coming off the top of the engine through this breather and back into the outlet that pushes the water back into the river....any ideas why this is happening???????

02-11-2011, 07:03 AM
It is an 'anti siphone valve' and may prevent the water from filling the exhaust system and entering back into the engine when sailing.
Usually a rubber membrane inside that may have broken.
Not a typical Yanmar part, any valve from Volvo, Vetus etc may do.