Frank,
I found that one that runs horizontal on the top of engine from the exhaust cavity plate and it is very small. I think by backwards tracing the water goes through exhaust cavity under the exhaust plate then enters through that small horizontal hole into the top cylinder at the top of the top cylinder then drains on the bottom cylinder through a very small hole also like 1/8 inch toward rear of bottom cylinder at about 4 o-clock. It was clogged on the bottom 1/8 inch hole. This motor had like brownish white crust in the cylinder liners and that small hole on the bottom cylinder is subject to get clogged easily. This is not my motor but I wonder if some type of modification could be done to it such as adding a p tube on the bottom to make sure water is always flowing through the engine and could be visibly checked. I am going to clean the water jackets very well but it looks like it could clog up any second and prevent it from cooling. The person that owns this motor lives on a sailboat so the motor is running in salt/brackish water. I have tuned the motor and did a carb rebuild on it and it runs very well but if it won’t cool that’s the bigger issue.
Thanks,
Joe
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