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Re: WD continues to diesel after shut down
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From your post it sounds like this is the first time the engine was started after overhaul. Therefore, the problem occurred at the first shut down after a short running check out. Some cooling systems, especially if the thermostat seals tight can trap air until the thermostat opens and water actually flows. As a result the cylinder head is not filled with water and can have hot spots. In this case the problem should go away once the system is actually filled. To this end, I like to drill a small vent hole in the thermostat flange (some have them) to bypass water preventing this problem.
I am not an AC expert and do not know what compression results with a 45 crank and 175 pistons. You will need to use gasoline with an octane rating to account for any significant increase in compression. Also, if the bore was increased you should run a head gasket which accounts for that. If the gasket extends into the cylinder it can run hot resulting in problems.
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