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post #1 of Old 11-07-2008 Thread Starter
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Three-Way Valve for Engine Sea Water Intake

I am sure that someone has thought of this before, but anyone here install a three-way valve as the primary shut-off seacock for sea water intake for engine coolant?

Why would anyone want to do this you may ask? I was thinking of doing to make it easier to winterize my motor. The three way is a T configuration that has valve that directs the primary flow to either one side of the T or the other depending on on which way the valve is turned. I would install the valve and plug cap one of the T sides and connect the other T side to the impeller pump/motor. Under normal operation, the valve would be turned in that direction. When I want to shut the water flow to the motor, I'd flip the lever to the other T side, which is plug capped so it won't leak.

To winterize the motor, I'd remove the plug cap and connect a nipple w/hose tube to the valve. Put the other end of the hose into a bucket of Antifreeze and then flip the valve to the open the flow that way.

The benefits, as I see it is that I never have to remove a hose from the sea water system to put in anti-freeze. This is a pain as my hoses are REALLY tight on my fittings. The down side is that the valve is never truly closed to the sea. The seal is the cap plug.


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