We are doing the first fire up on a Merlyn Mk 29 we have been restoring. The engine will not stop overheating. The radiators are in the back along the side of the engine and are connected by a pipe that runs over the top. There is a hole in the top of the pipe which connects to a tube which, in turn, connects to the top of the expansion tank. When we disconnect that tube the temp holds around 200, but when it is connected it shoots up over 240. Does anybody have any experience with this? We think it is an air pocket forming in the system but cannot work out how to get it out.
Any ideas?
Any ideas?
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