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Old 07-09-2019, 23:19   #1
B4A
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Vented loop/Siphon break on Leopard cats

How many Leopard owners have installed a vented loop/siphon break on their Yanmar engines?

How many Leopard owners had their engine flooded because they did not have a vented loop/siphon break?
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Old 14-02-2021, 20:48   #2
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Re: Vented loop/Siphon break on Leopard cats

I too am looking for feedback on this question, please?
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Old 14-02-2021, 21:09   #3
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Re: Vented loop/Siphon break on Leopard cats

Quote:
Originally Posted by zimnz View Post
I too am looking for feedback on this question, please?
Not a Leopard owner but any engine which might, in some conditions, become lower than the outside water level (such as in your leeward hull) can be subject to flooding and hydrolock.

I've experienced it, not fun.

A syphon break in the cooling water output line between the heat exchanger and the exhaust injection point in the exhaust elbow is important and easy to do.

Mine is a long loop going to a high point with a small "T" at the top and a small hose going into a cockpit drain.When the engine is running a small amount of water squirts out the small hose. (I can see and hear this). When the engine is stopped air gets into the system through the small hose and prevents water from syphoning into the exhaust manifold and then into a cylinder.
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Old 14-02-2021, 21:21   #4
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Re: Vented loop/Siphon break on Leopard cats

Thanks - yes I am familiar with the concept. My question was a followup to the original post, and in the context of Leopard specifically, who do not provide for this, or think it is necessary. Despite several occurances on Leopard vessels to the contrary?
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