I would pull the radiator off then remove the lower collant housing. Now with hose and a nozzle spray water into the block to try and backflush that part of the block. There are four hles letting coolant down past the wet sleeves and one or more of those ports are probably blocked and not lettint the collant flow thru and into the radiator. You can use a maglite to see in there and use a stiff piece of wire you can get those holes open and flush out all the loose junk. I have overhaulled several of those engines in the last 10yrs since retiring and playing with my hobby tractors. Also have parted out several blocks and when the sleeves are pulled amazing how deep the crud will be in the bottom and plugging the holes. Using good pressure and compressed air you will be able to get the flow going thru the block like its supposed to go and that will be the end of your colling problems. You can also add a water pump at this time ifn ya want to the pump will make sure it runs cool.
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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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