The running on gas for the cool-down has got me a little curious on a couple of points.
Gas gas burns hotter than diesel, and I'd think burning gas would actually help keep it warm. But then maybe that's the point,that you might get a more gradual cool-down with the gas??? I know the Cummins in my Ram has a more complex injection system, but it runs under load with a coolant temp about 190*. If I leave it to idle, it will drop in a fairly short time to about 160*. On that engine, the cooldown is actually more critical to cooling down the turbo to keep the oil it uses as a bearing from coking up on the shaft.
Other thing that comes to mind is that maybe somebody in recommending switching back to gas was thinking of the distillate dual-fuel engines. On those you did want to switch back to gas and leave it run for a few minutes afterwards, to flush all the distillate out of the line and carb so that you'd have a bowlful of gas the next time you start. Saved draining the bowl to get it to start next time.
Mind, I'm not challenging anything, just curious. If the books or experience call for idling to cool it down, by all means that's the way to do it.
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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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