Quote:
Originally Posted by Dave Neptune
Adam, the anti-syphon valve would be mounted in a "loop" above the waterline on the water line that feeds into the exhaust from the manifold. When the engine is running the water pressure holds the valve closed and the water goes out the exhaust. When the engine is shut down the valve opens and lets air into the line to "break" the syphon. This syphoning is what will fill the engine with water if it fails!!!
Some boats do not have the anti-syphon valve as they are using a different exhaust, even on the A-4's.
Dave Neptune
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Ok...really good to know. I'll have a look when I am down there next. Although the noise I am hearing sounds like it is on the other side of the engine from where the exhaust is.
Adam