I don’t necessarily mean it’s not from pressure, not throwing that completely out, but when cold it does not bubble so assuming not pressure related at cold. Could still potentially be a cracked head and it just becomes noticeable when the head warms up and expands.
It’s not from pressure. It does perfectly fine for 20-30 minutes then just gets outrageously hot. The water is boiling when it’s shut off. Not the appearance of boiling from pressure, I pull both caps off to relieve pressure and it continues to boil.
I have a Kubota TG1860 Diesel with the 3cyl 722D engine. I've replaced the radiator because when I first got the tractor the top of the radiator was blown off. Then, I replaced the head gasket and all the top end gaskets along with it because my assumption (which I believe was correct because...