Over Heating & shutting down

I am having a problem with my 1966 - 930 Case CK over heating. Changed water pump & thermastats & would get 3 trips around the yard & it would shut down. I pulled the thermastats out & got 5 trips around the yard before it shut down & the yard is less than a acre. Can someone please let me know what is happening, Please & Thank you very much.
Sincerely, Ted

Radiator fins plugged?
Radiator tubes plugged?

Are you getting air bubbles in radiator. Kind of sounds like a head
gasket to me.

How does it ..shut down..? There is essentially nothing
in the diesel injection system that will turn the tractor
off because the engine is hot. It should keep going
until a piston seizes in a cylinder and locks the engine.
Is there steam blasting out of the radiator cap like a
tea kettle? The gauge tells you it is hot? If it is not
boiling or steaming you are going to have to find a way
to verify it is hot. Get a hand held IR temp gun they are
about $20 and then see what it shows. Or if it is that
hot you should be able to see water sizzle when you
flick it on the upper part of the block under the heads
with your finger. I am thinking that your fuel filters are
the problem.

What do u mean it shuts down? Does it have Murphy
gauges installed as thats would be how it shuts down. Is
it running hot ? Hard to tell As u dont say if its getting to
boiling or whats happening. The rad cores can also be
plugged to cause the problem. Which it appears to be.
Can u see the cores when u look in the rad with coolant
down? The Only way it will shut down by its self is plugged fuel filters, or Murphy gauges as I asked.

Is there a screen in front of the radiator to keep debris from clogging up the radiator fins? If so that may need to be cleaned. As others have said though, it doesn't sound like overheating problem.
Dave

Pushing an overheating engine until it is so hot that it will no longer run is not good for the engine. Most likely, if it was a simple problem before, it is not so simple anymore.

That is, assuming, you are in fact over heating, and there is not some kind of mechanism that is shutting the tractor down before damage is done.

Pulling the stat is never a smart idea beyond a couple of hours for trouble shooting .

Spun main bearing?

better give us some details, before we call this a hopeless case.

I'm with the nothing to shut it down unless it has Murphy switches or runs out of fuel /air or both unless you have a bearing seized on the crank or piston in the cylinder. So now if it is really getting hot it is kind of rare but are you sure the impeller is turning on the water pump or slipping on the shaft not turning up to speed or just not turning. also is the fan belt and pulleys in good shape both can cause the water pump to not turn up to speed like a worn belt will slip and worn pulleys can even flip the belt off if bad enough. Then if you determine it is not the hot option check fuel filters and fuel cap for not venting. Filters first and they might give you an idea if the cap is not venting by watching the flow from the line catching in a pail. Or loosen cap while driving right after it stops loosen and listen for air sucking in.

if you have the thermastat out with the radiator cap off you should see coolant circulating on starting the engine if not either the water pump is bad
or there is something plugged up somewhere. once you determine that the water is circulating fill it up with coolant if it bubbles or blows out coolant
you have a bad gasket or bad sleeves. also is there water in the oil?

Hello all, sorry I have been pressure washing the fins on the radiator as they are plugged 3/4 the way up. it took me 3 days, 6 hrs the first day 5 1/2 hrs & 8 1/2 toady but it's cleaned out now. It came from a farm in Alberta & it's probably never been cleaned. Hope that was the problem as I won't be testing it out til tomorrow. As for the tractor shutting down, I don't know about Murphy switches but I never had a temperature gauge working as the top of the temperature plug was broke off when I got it. At that time I don't know how hot is was getting but I would make 3 trips around the yard & it would just die. It was hot as antifreeze was coming out of the over flow stem as far as I could see. Few hours later it would start back up. I have a temperature plug now & I took the Thermastats out & got & got 5 trips before it quit. The day I posted was the day I tried it & got 5 trips around the yard & it died in the middle of the driveway. I looked at the temperature gauge & it said over 200. So it must have something in the engine to shut down when it gets hot. I hope that is all it was. I Greatly Appreciate all the advice. Sorry it took me so long to get back to the site. I saw the first post about fins & tubes & have been working on the fins. They are all clean now. Thanks again to all. I will keep you all updated how it goes tomorrow.

Sincerely, Ted

This post was edited by Ted Monfee on 08/16/2023 at 04:52 pm.

Hello all, Update, I tried the tractor today after all that work on the radiator & it is still over heating. It is coming from the over flow stem by the radiator cap? Maybe the radiator cap is not holding pressure & needs changing or something else. How hard is it to find a new radiator cap for that tractor or does it just need to be a certain pressure range? It got to 200 so I shut it off. That is when I noticed it leaking alittle antifreeze. Not alot but it is leaking from the stem by the cap. Should I try a new cap first? Or would it be more than just a cap? Maybe I need to pull the radiator off & flush it out? Or maybe it is a head gasket? No antifreeze in the oil thou. Lots of posts about what it might be. I guess I should start by taking the radiator out & flushing it good. And then work down the line of ideas you all gave. I am sure you have all gave up on me as it took me 3 days to get back to you all. Sorry for that to all of you. But I did not think there was going to be more post then the first one, lol. And I was hoping that was going to be the problem. I know now that there will be a few posts to check out. So Sorry to all for leaving you all hanging. Thanks again for all the advice. Have a good safe day all
Sincerely, Ted

Hello to all, I started the tractor toady & it looks like its circulating with the cap off. No bubbles. When I was spraying out the fins I had it running for 3 hrs & it stayed around 150. I was using the fan to help pull the fines out of the fins. It did not over heat thou. I have changed out the water pump & all 3 belts so i don't think anything is slipping. When I fired it up to check the circulation it went from 100 t0 140 in about 5 min but you could see it trying to circulate. It was just below the stem circulating so I filled it up to just over the bottom of the stem to see if it would start making bubbles but no bubbles just looked like it was trying to circulate. So not sure what else to check beside taking the radiator out & flushing it out or trying a new radiator cap? Should I send Pics of it circulating? Maybe it's not circulating enough.
Ted

This post was edited by Ted Monfee on 08/18/2023 at 04:08 pm.

Proving that the coolant pump is moving coolant with vigour would be a good place to start .

Ok, how do you do that?
Ted

I ran my tractor today. What is the optimum running temperature? I ran it til it got close to 200 then shut it off. It was not bubbling over out of the stem cap today but I put a temperature gauge on it & If you are sitting in the drivers seat the left hand side of the engine was 211 & the right side of the engine was 251 a bit of a difference. Does that mean there is something wrong with the right hand side of the engine? I would still like to know how to check if you are getting good circulation. Hopefully someone has a idea. Thanks again all

Ted

(quoted from post at 14:58:31 08/19/23) I ran my tractor today. What is the optimum running temperature? I ran it til it got close to 200 then shut it off. It was not bubbling over out of the stem cap today but I put a temperature gauge on it & If you are sitting in the drivers seat the left hand side of the engine was 211 & the right side of the engine was 251 a bit of a difference. Does that mean there is something wrong with the right hand side of the engine? I would still like to know how to check if you are getting good circulation. Hopefully someone has a idea. Thanks again all

Ted

Click to expand...

What is a stem cap? What does "trying to circulate" mean?