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Farmall & IHC Tractors Discussion Forum
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756 international cooling problems

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Kkendall

12-31-2018 10:43:29




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I have a 1968 756 international and having cooling problems I have replaced radiator belt hoses new thermostat flushed block
The tractor starts great and runs great but it warms up and gets hot I have replaced gage and sensor checked to see that thermostat opens at correct heat it does it will stay at half on gage when idling but when it rev it up to 1000 rpm it starts getting hot if I shut it down the thermostat will click open and close does anybody have any suggestions
Kkendall

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Kkendall

01-04-2019 18:51:41




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 Re: 756 international cooling problems in reply to Kkendall, 12-31-2018 10:43:29  
One more thing to s question the tractor is a diesel international D30 thanks



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Kkendall

01-04-2019 18:48:59




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 Re: 756 international cooling problems in reply to Kkendall, 12-31-2018 10:43:29  
Quoting Removed, click Modern View to see

Thanks for all the great information looks like thermostat was not opening had a nother set of eyes look st the problems that I was having and after testing cooling system the water was not passing through the thermostat he tested it and at 180 it was barley opening hard to find exterior thermostat so I have an old one and we are going to take interior parts out of it and we hope this will solive problem all of your comments we verry helpful thank you all again if any one has a comment on not running thermostat please advise. Thanks Kkendall

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used red mn

01-01-2019 14:58:49




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 Re: 756 international cooling problems in reply to Kkendall, 12-31-2018 10:43:29  
kKendall, Welcome to YT! Sorry if it seems like some of the replies you get come on a little strong, it just some folks style. Okay, please donít think I am insulting you by any of the questions or read in any implications Iím just trying to sort out you knowledge level and experience with equipment. I would really like to hear some feedback from you on some of the questions others have posed in their replies. If you arenít familiar with forum layout just poke one of the ...reply... buttons in your post box or any of the other replies to respond. My question would be how are you checking it is getting hot? If you can get a hand held laser point thermometer this would be very helpful in proper diagnosis of your issue. These can be purchased for a reasonable price at many home improvement stores. Does the radiator ever boil over with hot water and steam? Iím suspicious of the comments you made about the thermostat ...clicks open... there is generally no detectable noise associated with its operation. It would be very helpful to know the ambient...outdoor... in building etc. ... temperature the tractor is operating in? Gas or diesel, was it operating fine at one point or is it new to you and you have very little history with it? An electrically operated temp gauge can act very strange and give false readings with a loose connection. Something as simple as the fan blowing on the sender wire connection as it speeds up could be your issue. I understand not every goof spends his holiday poking around on a tractor forum so you might not seen the replies yet, but oh well. You may have even found another forum and got your problems solved there, if so let us know so our head scratching can move on to other issues. As many on here say ...TIA...Thanks in advance... Sorry this was so long. PS Welcome again!
Rick

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Happyfeet

01-01-2019 08:42:51




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 Re: 756 international cooling problems in reply to Kkendall, 12-31-2018 10:43:29  
Are you running the proper mix of antifreeze and water? Antifreeze alone without water will not cool properly.



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The tractor vet

01-01-2019 08:03:17




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 Re: 756 international cooling problems in reply to Kkendall, 12-31-2018 10:43:29  
Ok so you have a 756 WHAT , gas or diesel ?? this would really help here . If it is a gasser i will start with INg. timing first as you need 18 degrees full advance at wide open throttle , you have to have spark plugs no hotter then a 3116Autolite, a C 86 A/C oor if ya can get it to run on a D 15Y Champion. Next ya need the correct gas if it is a gasser , you can NOT work them on todays pump gas , yea someone will come on and say i don't know what i am talking about . i only work on them for a living . Next you maybe getting compression into the cooling system due to a leaking head gskt, cracked head and or block . Maybe to lean of fuel mixture . And maybe the water pump . Diesel it could be a leaking injector cup , cracked head and or block, again pump timing and fuel set , blowen head gskt . I am not there to look for myself.

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brownie450

01-01-2019 05:23:30




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 Re: 756 international cooling problems in reply to Kkendall, 12-31-2018 10:43:29  
Are you sure the thermostat is installed correctly?

I put a new thermostat in our pickup [345 V-8] during
fall work, & got it in backwards. Mind gets kind of
fuzzy when you're tired.
Might be worth checking.
Jim



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Bob

12-31-2018 16:09:50




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 Re: 756 international cooling problems in reply to Kkendall, 12-31-2018 10:43:29  
"if I shut it down the thermostat will click open and close"

I think, rather, you are hearing a pocket of the HOTTEST water BOILING.

Could be a plugged passage somewhere, an incorrect gasket, or even a waterpump with a failed impeller. (I ASSUME the t-stat is the correct one, and not installed upsidedown?)

Also, a combustion pressure leak into the cooling system will make "air pockets" that interfere with coolant flow and create hot spots.

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rustred

12-31-2018 11:52:00




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 Re: 756 international cooling problems in reply to Kkendall, 12-31-2018 10:43:29  
first thong I do is check the rad cores for being corroded and plugged, as a plugged radiator is usually the first on the list , a diesel engine produces little heat at idle so you don't notice till under load. those rad's are old and don't know when it was hot tanked.



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leroy in ne

12-31-2018 11:08:32




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 Re: 756 international cooling problems in reply to Kkendall, 12-31-2018 10:43:29  
Gas or Diesel? Is the coolant oily on top when stopped? Have you looked in radiator to see if there are bubbles in radiator? If so possible head gasket or cracked head. Have you looked in radiator to see if coolant is circulating when up to temp? I personally have had a water pump impeller come loose on a car causing over heating and have heard of the metal vanes being corroded off of impellers. That should give you some things to think about checking. Hope this helps.

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Janicholson

12-31-2018 10:58:49




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 Re: 756 international cooling problems in reply to Kkendall, 12-31-2018 10:43:29  
We do not know if you live in MN, or TX it makes some difference. We also do not know history (with you or a former owner. If it is not loosing any coolant (into the oil, or out on the ground) the issue is probably one of four things. A plugged up radiator core that will not allow enough coolant flow. A plugged up radiator fins not allowing air flow. a collapsed radiator hose (internal to the hose, not visible, works like a heart valve). or a failed water pump (loose impeller) Jim

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