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Yes, I agree with that. My assumption is that the valve seals allowed the water to pass into combustion chamber? Not trying to be argumentative I am just dumbfounded how fresh water ended up on top of the cylinders. I tasted it and it didn't taste like sea water. A ran the engine up to temp yesterday for at least 30 minutes and changed the pil twice, today when I checked oil it was clean and same level as yesterday. I also cranked the engine over by hand today and it didn't lock up with water on the pistons. Then fired right up.
With having little experience with risers, is it common for them to fail and have sea water enter the chambers and then stop? Once the path has been created for sea water to enter the combustion chamber would it not continue?
If the water entered the cylinders due to corrosion of the risers then yes, the water flow would continue until the risers are replaced.
If the water entered the cylinders due to backflowing through the exhaust piping due to the boat sitting unusually low in the water...that is a unique circumstance that shouldn't happen until the next time the boat is floating low in the water (which is hopefully never again).