

I am not sure you have a problem. I have two MF245s (on two separate properties) which share the Perkins AD3.152 engine with your MF231. One has a front hydraulic pump and one does not. The one with the front hydraulic pump clogs up the radiator with grass seed while brush hogging that comes through the opening in the grille for the pump shaft. When plugged, the engine heats up and the needle will get into the upper end of the meter if I don't stop and blow the radiator out (backwards) with an air hose. The other that does not have an opening for the pump shaft never plugs up the radiator and never overheats. I have never checked temperatures in the locations you have but they don't seem to be too abnormal to me. The fact that your top to bottom temperature drop on the radiator seems to indicate flow.
Ok I ran it at about 1800 RPMs with no water in the radiator, and the radiator cap was off for just a couple minutes. The needle climbed all the way just into the white. Put the laser down into the neck of the radiator fill and it was 215 degrees. The outside of the thermostat housing was like 204 or 205. I quickly added water because I didn't wanna blow the head gasket. When the water was back in it the needle on the gauge came back down very fast in the green just like the pics. The thermostat housing went down to 166-170 depending where I pointed the beam on the laser.
I'm not sure if there's a problem now or not!
Again its a $15-30 Tstat. Replace it then you will know. Its a cheap piece of mind. Normally when there is a issue (with clean radiator of course) theres probably 80% chance you have a Tstat thats not fully opening. Just to be sure your saying it overheats even with a clean radiator correct? Use a flash light to make sure its clear between fins. Unless these engines normally overheat under heavy load (which I doubt) then you must have a issue. All diesel tractors Ive ever used (most are older ones) never come close to over heating. This is because many of the older tractors anyways had the engine hp set back to a very conservative number to protect from these issues. Newer tractors use smaller displacement engines so maybe this is no longer the case and they squeeze every last thing out. By the way never get a engine hot then add cold water. This is a great way to crack your block. Sent from my iPhone using TractorByNet
Again its a $15-30 Tstat. Replace it then you will know. Its a cheap piece of mind. Normally when there is a issue (with clean radiator of course) theres probably 80% chance you have a Tstat thats not fully opening. Just to be sure your saying it overheats even with a clean radiator correct? Use a flash light to make sure its clear between fins. Unless these engines normally overheat under heavy load (which I doubt) then you must have a issue. All diesel tractors Ive ever used (most are older ones) never come close to over heating. This is because many of the older tractors anyways had the engine hp set back to a very conservative number to protect from these issues. Newer tractors use smaller displacement engines so maybe this is no longer the case and they squeeze every last thing out. By the way never get a engine hot then add cold water. This is a great way to crack your block. Sent from my iPhone using TractorByNet
Wow, I never would have done that but it sounds like kept your eye on it. I really don't see that you have a problem. Your gauge went high when the radiator was plugged and that is what I would expect.
This is a diesel engine right? If so I doubt it gets very hot with no load as they normally run much cooler than a gasser. To be safe I would change the Tstat as its cheap and may just solve the issue. I'm not familiar with your tractor but all my Fords and my MF 461 will never over heat even with 1/2 or more clogged radiators on 90F days so sounds to me like you have a issues some where provided the motor is diesel. For example my 461 would not over heat even with the defective Tstat until I put a decent load on her. Once I put a good one in it now it never goes beyond mid range of green on temp gauge. Sent from my iPhone using TractorByNet