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Old 01-01-2019, 05:54 PM
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To answer a few of your questions.

1. The pic of the 3 way valve is in the pic.
2. It looks to me that the intake thruway valve, the one where it goes through the boat, has a handle missing. That needs to be working and fixed if necessary. You need that intake valve closed and the 3-way valve open to draw water into the engine.
3. Yes, you should remove the T-stat to winterize. Replace the housing with the old gasket or some silicone.
4. With the T-stat out I have a small valve there on that line coming off the T-stat housing. I close that half and it allows antifreeze into the head passages as well as the engine and exhaust manifold.
5. No need to remove a plug if there is antifreeze in the engine. I have never done it.
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