It also depends on where the vacuum line is hooked. Some are hooked directly to intake manifold, most are above the throttle shaft. The larger IH v8 gasoline engines hooked into intake manifold. You had to unhook them to time the engine with a light. With it unhooked and timed correctly the engine would labor, then you hooked it back up and it ran free. I remember a service station in town timed one with it hooked and that made timing about 14 degrees late. Was an easy fix to get the power back up for that customer . Other engines hooked that way also but this one always stuck in my mind.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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