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Original style radiator cap

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Coventry plumber
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Original style radiator cap

Postby Coventry plumber » Thu Sep 28, 2017 7:33 pm

Can anyone tell me how loosely or tightly a original style non pressure cap should fit ? Should it wobble or be snug ? The new one i just put on is very loose I think ., Thanks Tom
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Bob McCarty
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Re: Original style radiator cap

Postby Bob McCarty » Thu Sep 28, 2017 8:26 pm

Mine fit pretty tightly. It should seal well enough that any excess antifreeze goes out the drain tube and not out the side of the cap. I assume the gasket is there? You might be able to bend more angle in the tabs to get it seat tighter.
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Coventry plumber
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Posts: 63
Joined: Sun May 29, 2016 1:28 pm
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Tractors Owned: Cub 1950,1952
Farmall H 1946
Cub Cadet 128 1974
Panzer T70 1962
Pennsylvania panzer 1107 1969

Re: Original style radiator cap

Postby Coventry plumber » Thu Sep 28, 2017 8:43 pm

Bob McCarty wrote:Mine fit pretty tightly. It should seal well enough that any excess antifreeze goes out the drain tube and not out the side of the cap. I assume the gasket is there? You might be able to bend more angle in the tabs to get it seat tighter.


Thanks , I'll try bending the tabs tomorrow , I didn't want to alter it with out checking with someone first . I am also considering doubling the gaskets if necessary also .
Thanks. Tom
Rhode Island Antique tractor club
Chapter 18 International Harvester collectors club of N.E

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Coventry plumber
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Joined: Sun May 29, 2016 1:28 pm
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Tractors Owned: Cub 1950,1952
Farmall H 1946
Cub Cadet 128 1974
Panzer T70 1962
Pennsylvania panzer 1107 1969

Re: Original style radiator cap

Postby Coventry plumber » Mon Oct 02, 2017 5:40 pm

Apparently my radiator neck will not fit a old style cap. I try bending tabs , I tried a nother new one . Not going to happen . My radiator has been replace previously and I suspect something is different . It's the 1" tall neck . A pressure cap fits so I will have to settle for that . Will a 7 lbs cap have any repercussions? I believe that's what I had last year before I started restoration . Thanks Tom
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Re: Original style radiator cap

Postby Glen » Mon Oct 02, 2017 6:10 pm

Hi,
The 7 lb cap was evidently what IH offered for the pressure cap, it is what TM Tractor sells.
It says it is the genuine part there.
The pressure cap is harder on the system than the non pressure cap, the pressure will push out coolant anywhere that can't hold the 7 lbs. But it probably doesn't always have 7 lbs pressure in the system when running, only when fully warmed up probably.
Below are listings for both styles of caps, the non pressure cap should look like in the pics. :)

http://www.tmtractor.com/new/co/2537fp.htm

http://www.tmtractor.com/new/co/1642fp.htm
Last edited by Glen on Mon Oct 02, 2017 7:01 pm, edited 1 time in total.

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Coventry plumber
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Joined: Sun May 29, 2016 1:28 pm
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Tractors Owned: Cub 1950,1952
Farmall H 1946
Cub Cadet 128 1974
Panzer T70 1962
Pennsylvania panzer 1107 1969

Re: Original style radiator cap

Postby Coventry plumber » Mon Oct 02, 2017 6:26 pm

Glen wrote:Hi,
The 7 lb cap was evidently what IH offered for the pressure cap, it is what TM Tractor sells.
It says it is the genuine part there.
The pressure cap is harder on the system, the pressure will push out coolant anywhere that can't hold the 7 lbs. But it probably doesn't always have 7 lbs pressure in the system when running, only when fully warmed up probably.
Below are listings for both style of caps, the no pressure cap should look like in the pics. :)

http://www.tmtractor.com/new/co/2537fp.htm

http://www.tmtractor.com/new/co/1642fp.htm

That's the non pressure one that I have been trying .i ordered the pressure one today from TM also.
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Scrivet
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Re: Original style radiator cap

Postby Scrivet » Tue Oct 03, 2017 7:23 am

I have a pressure cap on one of my Cubs that came to me with a small wedge shaped chunk missing from the gasket. With a chunk missing it can't seal. No seal, no pressure.

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Coventry plumber
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Cub Cadet 128 1974
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Pennsylvania panzer 1107 1969

Re: Original style radiator cap

Postby Coventry plumber » Tue Oct 03, 2017 6:28 pm

Scrivet wrote:I have a pressure cap on one of my Cubs that came to me with a small wedge shaped chunk missing from the gasket. With a chunk missing it can't seal. No seal, no pressure.

I'm liking the sound of that . i will try that with the new cap when it comes in . Thanks
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outdoors4evr
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Re: Original style radiator cap

Postby outdoors4evr » Wed Oct 04, 2017 6:30 am

That's what I did with mine. I used a new cap and cut a slit in the gasket.
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Re: Original style radiator cap

Postby Pompiere » Wed Oct 04, 2017 11:39 am

What are the pros and cons of running pressurized vs. non-pressure cap. Does the Cub engine run better or more efficient on one vs the other? Did any of the Nebraska tests mention it? Boiling point at 7 psi is 232 degrees vs. 212 at 0 psi. I have one of each, but the tractor with the 0 psi cap doesn't work hard, so not a good comparison. The Lo boy has a 7 psi cap and I use it to mow. It will vent off if I overfill the radiator, but once it reaches the proper level, the venting stops.

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Re: Original style radiator cap

Postby Scrivet » Wed Oct 04, 2017 9:14 pm

Pompiere wrote:What are the pros and cons of running pressurized vs. non-pressure cap. ....
A pro of putting a pressurized cap on one that has been running non pressurized is that you can find out if there are any weak spots in the radiator. :D
Another potential pro is you get to make new friends at your local radiator repair shop if you haven't already met them.
Then it'll be just like Christmas when UPS brings the new one and you open it. That is after you've put the radiator shop guys kids through college paying for repairs and the old one still leaks.

Seriously, I don't think twenty degrees is going to make any noticeable difference in operation.

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Coventry plumber
5+ Years
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Posts: 63
Joined: Sun May 29, 2016 1:28 pm
Zip Code: 02816
Tractors Owned: Cub 1950,1952
Farmall H 1946
Cub Cadet 128 1974
Panzer T70 1962
Pennsylvania panzer 1107 1969

Re: Original style radiator cap

Postby Coventry plumber » Thu Oct 05, 2017 5:17 am

Scrivet wrote:
Pompiere wrote:What are the pros and cons of running pressurized vs. non-pressure cap. ....
A pro of putting a pressurized cap on one that has been running non pressurized is that you can find out if there are any weak spots in the radiator. :D
Another potential pro is you get to make new friends at your local radiator repair shop if you haven't already met them.
Then it'll be just like Christmas when UPS brings the new one and you open it. That is after you've put the radiator shop guys kids through college paying for repairs and the old one still leaks.

Seriously, I don't think twenty degrees is going to make any noticeable difference in operation.


Point well taking, I'm not looking for new friends .Thanks Tom
Rhode Island Antique tractor club
Chapter 18 International Harvester collectors club of N.E


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