A lot of thermostats come with a small hole, but not 1/8th inch . More like .050 or less. The 560 will air lock but the bleeder valve discussed here always has released the air for me. On other models I often loosen the temp gauge to let air escape but this is normally on an engine I have just assembled so it is easy to loosen. On the M and H style thermostats it is pretty hard to get an air lock unless the wrong thermostat is being used. The correct ones don't seal all that well in the housing. Over the years some automotive style thermostats have been installed in them and they do not allow the by pass system to function correctly. Some auto stores still sell the wrong ones I think.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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