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 - Product Review: JB Weld - by Staff. JB Weld is basically an epoxy glue that does an exceptionally good job of bonding to cast iron and steel along with several other materials. As I mentioned, it is so common that I have yet to buy a tractor that did not have JB Weld used somewhere. It is sometimes used so well you can't tell its there and other times used as a sloppy quick fix. Finding where and how it can be used correctly is key to whether you are using it as an "inelegant hack" or an integral solution to difficult and expens
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