Before you ruin the motor, install a temp gauge and find out why the motor is getting hot!!!!!!!
Could be a bad water pump, low coolant, stopped up radiator, stuck thermostat, loose belt
My friends 135 mf, they let weed seed build up in front of the radiator and they had a temp gauge, Instead of cleaning the radiator, they just let it cool then back at it until it started burning oil like a coal burning freight train.
Cost a lot to have it rebuilt and for no reason, but lazy or lack of knowledge, just thought it would run for ever, but they paid dearly for their mistake.
Good luck and take care of the little tractor, these tractors can not take too much overheating.