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Pressureized - OR - Non Pressureized????????????

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BIG JOHN

02-11-2004 18:44:38

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I've been working on my new SAV and I pulled the raditor to replace the front seal.

The raditor cap was a 7lb pressure cap but it was no longer a pressure cap (modified). This sent me to the manuals that I have. They says that the thermosyphon systems were equiped with non pressureized raditors to start with and then changed to pressureized raditors later on.

Do we know when (serial number, date, etc)when the change was made?????

Is there an easy way to tell if the raditor is either a pressureized or non pressureized raditor????

What is the recommended pressure for raditor caps on pressureized systems????

Is there more than one style of NON pressure raditor cap???? (most of mine seem to be modified pressure caps or just a cap with no guts)

THANKS FOR YOUR INPUT!!!!!

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Hugh MacKay- help Sam NS

02-11-2004 19:32:42

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Re: Pressureized - OR - Non Pressureized????????? in reply to BIG JOHN, 02-11-2004 18:44:38

John: There was a change on Super A near serial number 336,000. My Super A is 336977 and the change occured just a few hundred before my tractor. The engine block changed and became same block as C-123 engines, they used thicker sleeves, thus still keeping the engine at 113 cubic inch. At the same time and I think I am right on this radiators changed to presureized. There was a discussion on this about 6 months ago, and someone, I think it was Sam from NS, quoted the exact serial number of the changes and exactly what the changes were. I'm going to put help Sam after my name on heading, as I would like to know this also, should have had the pen out 6 months ago.

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CNKS

02-11-2004 20:10:41

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Re: Re: Pressureized - OR - Non Pressureized????? in reply to Hugh MacKay- help Sam NS, 02-11-2004 19:32:42

Pressurized at 336711, or about Dec 1952, but the block was changed at 310300, or about the middle of 1951, part number for the that block is same as the C123, according to my parts book. Strangely, to me anyway, the Super A1 block suffix is R2, the same part number for the Super A block is R3?? Super A's part numbers are too complicated for me. -- H, M, etc are simple.

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Hugh MacKay

02-12-2004 02:18:29

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Re: Re: Re: Pressureized - OR - Non Pressureized? in reply to CNKS, 02-11-2004 20:10:41

CNKS: Thanks for that information, I have now recorded it in case of future need. Probably you were the guy with the info 6 months ago. I don't know where Sam is tonight, usually discussion such as this don't get by him. He is single, 20 and at University, Sam could be attaining other interests.

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CNKS

02-12-2004 08:22:38

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Re: Re: Re: Re: Pressureized - OR - Non Pressurei in reply to Hugh MacKay, 02-12-2004 02:18:29

It wasn't me 6 months ago, but I do remember a post maybe as much as 2 years ago about the different C113/123 engines. My guess would be that the block change came before the raditor change because that was about the time the 123 in the Super C came out, and for some reason IH was not yet ready to put the 123 into the Super A, so they used thicker sleeves--my guess anyway. I don't, however, understand the differences in the 3 listed radiators that Sam mentions. As Sam says they can be run with or without pressure.

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Hugh MacKay

02-12-2004 09:46:37

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Re: Re: Re: Re: Re: Pressureized - OR - Non Press in reply to CNKS, 02-12-2004 08:22:38

CNKS: I suspect after the Super C went with C-123 engine, that would leave only Super A using the C-113 engine. It was probably less costly to make thicker sleeves than maintain production of two separate blocks. As for why they chose not to use the C-123 in Super A, it may have something to do with final drives. I don't know if they are more rugged in SA1, 100, 130 and 140, but I do know they are slightly different. The brakes on the latter are different, and I always thought the changes in final drive were solely to accomodate the newer brakes. Could be some increased strength there also. I must admit I never broke a final drive on a Super A, but have on 130. Two of them, both caused by wheel chains designed for use on ice, and indeed on ice is how they broke. catching and slipping.

We used ice chains here on the larger Farmalls for years, never a problem. I never knew until two years ago, but IH would not stand behind warranty on rear end and transmission on any of the British built tractors if ice chains were used.

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SAm in NS

02-12-2004 13:06:41

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Re: Re: Re: Re: Re: Re: Pressureized - OR - Non P in reply to Hugh MacKay, 02-12-2004 09:46:37

I agree with you on why they went to the C-123 block. However I've just looked in my parts manual and it indicates there was no change in the housing between the Super A and Super A1, but it does say that the brakes were changed. Tractors up until #339641 have simple band brakes (I believe this includes your tractor) and those afterwards have a type of "actuating toggle" which includes my tractor (#342732). Hope this helps. SAm in NS

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Hugh MacKay

02-12-2004 13:40:48

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Re: Re: Re: Re: Re: Re: Re: Pressureized - OR - N in reply to SAm in NS, 02-12-2004 13:06:41

Sam: Thanks for that. My Super A does have the simple band brake with pull rod made right into band. My 130 and 140 have the newer type with the toggle. What you say about brakes being the only change are as I originally thought.

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SAm in NS

02-12-2004 05:12:04

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Re: Re: Re: Re: Pressureized - OR - Non Pressurei in reply to Hugh MacKay, 02-12-2004 02:18:29

I've just looked and what I've got agrees with CNKS but I'll just add that the there was a new type of non-pressure cap available from #336711 and up. There are also three radiators listed in my parts book and it indicates that pressure or non-pressure caps could be used with all of them. Mine currently has a non-pressure cap but it needs replacing because when the tractors warm a sudden application of the brakes when snowplowing will send a spurt of antifreeze everywhere. I'm planning on replacing this with a pressure type. I didn't see this shortly before I went to bed last night, the most recent post then was about 2 hours prior to this as I'm several time zones east of many on this board. Hope this helps. SAm in NS

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Bob

02-11-2004 19:09:36

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Re: Pressureized - OR - Non Pressureized????????? in reply to BIG JOHN, 02-11-2004 18:44:38

If your radiator is designed for a pressure cap, there will be a flat ledge down inside the filler neck, where the rubber washer on the spring-loaded plate that extends from your pressure cap is supposed to seal.

If it is a non-pressurized radiator, the neck will be more open, and the proper cap will seal only at the extreme top of the filler neck.

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