Well, if it runs up and then back down something is opening and allowing flow. The primary purpose of a thermostat is to cause cooling in an engine. One of my pickups does that but didn't start until I let it set in the barn a year. Same thing, goes way up there to the point figure is going to boil over, then opens and runs correct until next time. I'm going to rebuild it, so no big deal. You don't have to replace your thermostat, but it might not be a bad idea if its uncharacteristic of how its performed in the past. Would I change it? It's your tractor, your decision.
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Today's Featured Article - Search For Spares - by Anthony West (UK). Following on from the aquisition of the old Fordson F, I was very much in need of spares. As a novice though I didn't appreciate the fact that there were so many Fordson tractors made, that all the other makes seem rare by comparison. As far as I was aware a fordson was a fordson and it was only through trial an
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