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C-113 or C-123 how do you tell??

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Wheaty

11-30-2006 09:31:25

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Ok, i am in need of a block for my Super C. I am going to look at one this weekend, and i want to make sure that it is a C-123. Acording to my serial number the tractor dates to be a 54 model. I am not the original owner of this tractor. I know that some blocks will have either C-123 or C-113 stamped on them. I have the engine out of the tractor on a stand. I do not see any where on the block that it states that it is a C-123. It is my understanding that all SC's are to have a C-123 and the C's have a C-113. Could I get some input from you folks as to figure out by the casting numbers on the block the differences between the C-113 and C-123. Are there certain numbers that point it out in the casting number, os is it the whole casting number itself that tells you? Thanks a bunch folks, Wheaty..:)

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Wheaty

12-01-2006 16:51:24

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Re: C-113 or C-123 how do you tell?? in reply to Wheaty, 11-30-2006 09:31:25

Ok, I think I am picking up what your laying down.. I measured the sleves in my bad block and they measure to be 3-1/4. I hope the block I am going to look at still has the sleeves in it.

I was hoping that there might be a casting number range that would give me some identification of some sort. I appreciate the input you folks have tossed me. Have a good weekend..

Wheaty

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gene bender

11-30-2006 10:32:07

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Re: C-113 or C-123 how do you tell?? in reply to Wheaty, 11-30-2006 09:31:25

Measure the bore if it is 3in you have a 113cu in. A 3 1/8 bore will be a 123cuin.

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teddy52food

11-30-2006 10:19:09

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Re: C-113 or C-123 how do you tell?? in reply to Wheaty, 11-30-2006 09:31:25

Do you have a sleeve out? Measure the bottom of the block where the o ring seal goes. I think the c113 is 3&5/16 and the c123 is 3&7/16. Someone correct me if I'm wrong. If it has 3&1/4 inch pistons it is a c123 block.

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Red Dave

11-30-2006 12:27:50

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Re: C-113 or C-123 how do you tell?? in reply to teddy52food, 11-30-2006 10:19:09

Close, but a C-123 will have 3-1/8 diameter pistons originally. 3-1/4 would be oversized in a 123, and many were re-powered that way.

The best way is what you said first, measure the diameter at the O-Ring, that will tell the tale.

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Hugh MacKay

11-30-2006 15:30:58

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Re: C-113 or C-123 how do you tell?? in reply to Red Dave, 11-30-2006 12:27:50

Dave: Measuring the hole where O ring seats will not give it to you in all cases. Super A after serial number 310000 had the same block as Super C with sleeves that had the same outside diameter, yet the SA sleeves were thicker giving 113 cubic inches. SA would have been 3" bore while SC was 3-1/8" bore.

I have one of those SA, and the sleeves must be 1/4" thick. I have been advised I can drop SC sleeves in there without modification.

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Red Dave

11-30-2006 16:16:10

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Re: C-113 or C-123 how do you tell?? in reply to Hugh MacKay, 11-30-2006 15:30:58

"after serial number 310000 had the same block as Super C"
"I can drop SC sleeves in there without modification."

For all intents and purposes that block is indistinguishable from a block that came out of a Super C, isn't it? So that block would be an excellent candidate to replace a bad Super C block.

If I was looking for a replacment Super C block, one like yours would fit the bill.

Or at least it seems like it to me.

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Hugh MacKay

11-30-2006 16:44:02

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Re: C-113 or C-123 how do you tell?? in reply to Red Dave, 11-30-2006 16:16:10

Dave: Bear in mind 310000 is a tractor serial number. It happened in mid 1951. By 1953 engine serial numbers were about 1600 higher than tractor serial numbers. In 48 they were the same or very close, not sure when the spread occured.

I expect by 1951, Super A would have been the only use IH had for the C-113 engine, thus it was more economical to manufacture two sleeve sizes than cast two different blocks.

After 100 and 200 is where it gets confusing, some of them have smaller bore blocks with thinner sleeves. I've never even tried to follow all of it, but this discussion will probably attract Stan in VA, he has the stats on all of these.

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