Radiator question

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Jim in SC
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Zip Code: 29527
Tractors Owned: 1951 Farmall H (SN FBH 366519)
1969 IH Cub Cadet 106
1999 John Deere LT155
2018 Husqvarna YTH18542

Tractor previously owned: :(
1951 Farmall Cub
Circle of Safety: Y
Location: Conway, South Carolina

Radiator question

Postby Jim in SC » Thu Jan 04, 2018 9:30 am

We got a little snow here in South Carolina last night and some cold temps, 22 degrees this morning. I took the Cub out for a spin in the snow. Oil pressure was slow to rise, but did okay. When I parked the Cub after about 15 or so minutes of driving around the property, I noticed it was overflowing radiator fluid pretty good. Looked to be coming out of the overflow tube in the top of the radiator. You can see the overflow on the ground under the radiator in the attached picture. The tractor has probably 50/50 anti-freeze in it (or did).

Any thoughts on the cause of this overflow?

Thanks!
Attachments
017a.jpg
Last edited by Jim in SC on Thu Jan 04, 2018 12:06 pm, edited 1 time in total.
"We sleep soundly in our beds because rough men stand ready in the night to visit violence on those who would do us harm." Sir Winston Churchill / George Orwell.
1951 Farmall H
1969 IH Cub Cadet 106
1998 John Deere LT 155
2018 Husqvarna

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Don McCombs
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Zip Code: 21550
Tractors Owned: "1950 Something" Farmall Cub
1957 Farmall Cub w/FH
1977 International Cub w/FH
1978 International Cub
1948 Farmall Super A
Circle of Safety: Y
Location: MD, Deep Creek Lake

Re: Radiator question

Postby Don McCombs » Thu Jan 04, 2018 9:46 am

Just the thermosyphon cooling system finding it's comfort level. Perfectly normal. If it continues in significant quantity, then look for issues.
Don McCombs
MD, Deep Creek Lake

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Jim in SC
5+ Years
5+ Years
Posts: 242
Joined: Mon Sep 15, 2014 10:16 am
Zip Code: 29527
Tractors Owned: 1951 Farmall H (SN FBH 366519)
1969 IH Cub Cadet 106
1999 John Deere LT155
2018 Husqvarna YTH18542

Tractor previously owned: :(
1951 Farmall Cub
Circle of Safety: Y
Location: Conway, South Carolina

Re: Radiator question

Postby Jim in SC » Thu Jan 04, 2018 11:44 am

Don McCombs wrote:Just the thermosyphon cooling system finding it's comfort level. Perfectly normal. If it continues in significant quantity, then look for issues.


Thanks, Don. That puts my mind at rest. Now to see if I can start it again to put it back in the barn!
"We sleep soundly in our beds because rough men stand ready in the night to visit violence on those who would do us harm." Sir Winston Churchill / George Orwell.
1951 Farmall H
1969 IH Cub Cadet 106
1998 John Deere LT 155
2018 Husqvarna

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Stanton
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Tractors Owned: 1942 Farmall AV, serial #87025
1947 Farmall Circle Cub, serial #2116
1948 Farmall Cub, serial #46066
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Location: Lone Jack, MO

Re: Radiator question

Postby Stanton » Thu Jan 04, 2018 12:06 pm

The radiator level for each Cub is slightly different, but if you had it filled up to the base of the filler neck, then it was probably too full to begin with. Once the engine heats up to operating temp, as Don wrote, it's just finding its own comfort level and dispenses the excess.

Nice Cub!
Stanton
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Jim in SC
5+ Years
5+ Years
Posts: 242
Joined: Mon Sep 15, 2014 10:16 am
Zip Code: 29527
Tractors Owned: 1951 Farmall H (SN FBH 366519)
1969 IH Cub Cadet 106
1999 John Deere LT155
2018 Husqvarna YTH18542

Tractor previously owned: :(
1951 Farmall Cub
Circle of Safety: Y
Location: Conway, South Carolina

Re: Radiator question

Postby Jim in SC » Thu Jan 04, 2018 12:07 pm

Stanton wrote:The radiator level for each Cub is slightly different, but if you had it filled up to the base of the filler neck, then it was probably too full to begin with. Once the engine heats up to operating temp, as Don wrote, it's just finding its own comfort level and dispenses the excess.

Nice Cub!


Thanks!
"We sleep soundly in our beds because rough men stand ready in the night to visit violence on those who would do us harm." Sir Winston Churchill / George Orwell.
1951 Farmall H
1969 IH Cub Cadet 106
1998 John Deere LT 155
2018 Husqvarna

rcupka
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Zip Code: 48176
Tractors Owned: 1949 Cub
1972 Lo-Boy 154
1964 Cub Cadet Model 70
2005 New Holland GT20

Re: Radiator question

Postby rcupka » Sat Jan 13, 2018 10:50 pm

I am so glad to read this, I just started my Cub after acquiring it from a 5 year sleep. I had filled the radiator prior to start. For the first 20 minutes I was leaking coolant and then it stopped. I checked tonight, it is not leaking and stabilized at a certain level. Plan to run it again tomorrow, really hope this is the tractor finding it's level and not leaking.
1949 Cub
1972 Lo-Boy 154
1964 Cub Cadet Model 70
2005 New Holland GT20

Landreo
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Re: Radiator question

Postby Landreo » Sun Jan 14, 2018 9:13 am

The fluid has to be at a certain level for the thermosiphon to work. The radiator inlet tube, the top tube, has to be under water otherwise the cooling system will function as a hopper cooled system and will continue to overflow as plugs of water and steam boil out of the block. The inlet tube has a tapered opening and the coolant level will cover that opening when it is about half way up the tube. That is essentially what happens when you fill to the IHC recomended level. Too much coolant will just flow out the top as the coolant expands from the heat. Too little coolant, "just fill until the tops of the fin tubes are covered", and it will continue to "find its own level" by boiling out. If you have filled to the IHC recomended level and it continues to overflow then there is poor flow and hot spots developing. Time to flush the radiator.


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