Many of the thermostat housings on those tractors are rusted so the coolant goes right on past the thermostat. Even when new there was not a positive seal as the tube slides up into the bored hole in housing. There is not enough material in there to install a seal on the gas engines but I have had it done on some diesel engines like 450 diesel. I have fashioned my own ideas on the old gas burners to ake the thermostat actually hole the coolant back. Also, like Jim says, bypass has a lot to do with them not warming up but all of mine do warm up even without the bypass restricted. Far as black smoke at idle, if the adjustments don't take care of it you most likely have wrong or damaged idle jet in carb. Had a guy bring a 300 carb into me last year that someone had been drilling things out and drilled the wrong jet for what he intended to happen.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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