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Allis Chalmers Discussion Forum
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Model IB

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Scott

07-04-2004 18:25:00




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Can anyone tell me how to determine the year model of a Model IB? Tractor number is 232.

The tractor is missing the hood. It's my understanding there were different hoods made to accomodate different exhaust systems. I thought if I knew the year, it would help me find the proper hood. The present exhaust is a straight pipe.

I'm also trying to determine the correct decals.

This tractor has the wide front end with the straight axle.

Any input will be appreciated.

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steve

07-05-2004 10:16:26




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 Re: Model IB in reply to Scott, 07-04-2004 18:25:00  
prior to the war, the IB was built along with the B and had a B serial number, so you can look up the year of manufacture on the B page. AFter the war they started with IB1000 and built up to about 2800 in the late 1950s. I have a 1952. The hood is the same as the B model, but there are two hoods. ONe has a bigger hole for the muffler exit. If you have an under the hood muffler, the hole is about 2.5 inches diameter. If the muffler comes out the hood, the hole is probalby 4 inches in diameter, unless you use an extension tube to get the muffler above the hood. The tractor has the same motor, hood, trans, final drives, steering, gas tank, radiator as the B. special parts included the turque tube from motor to trans is 6 inches shorter and there is a c-channel around the tractor, and it has WD fenders on it, with a pan seat. If any one needs additional info, or pictures of the tractor, i would be glad to hlep. [email protected]

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Scott

07-04-2004 19:02:07




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 Re: Model IB in reply to Scott, 07-04-2004 18:25:00  
Just wanted to correct my first post. The number is 2324. It is a highway maintenance version with a sicle-bar mower.



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DanaNC

07-04-2004 20:14:16




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 Re: Re: Model IB in reply to Scott, 07-04-2004 19:02:07  
HI, according to my book that I purchased because I just bought a basket case IB, yours is a 1952 model..take a look at the post from last week, it has some pictures of the one I bought, got a long way to go. HTH Dana



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Pete

07-04-2004 23:24:52




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 Re: Re: Re: Model IB in reply to DanaNC, 07-04-2004 20:14:16  
I have IB tractor number B20397 which, I have been told, was manufactured before WWII. At that time the IB designation had not yet begun. Do you have any information on date of manufacture or the original match between the tractor number and the engine serial number?



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Glenn in PA

07-05-2004 19:55:02




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 Re: Re: Re: Re: Model IB in reply to Pete, 07-04-2004 23:24:52  
Pete,

Allis Chalmers introduced the IB in Nov 1939. The first one was serial # 31101, according to AC production records. This corresponds to the B series tractors which ended the year near that number. Since the first 1939 B was near serial # 11800, your 20000 # would have been manufactured around the middle of the year. It is possible that you have an older transmission case on a later tractor. Check the casting number on the engine block, it should have a -xx number suffix. You can determine the year of manufacture from that suffix. Also check the engine serial number. If it is within a couple hundred of the transmission number, then it is likely the original engine. If it is a lot higher than the transmission number, then an older transmission was swapped in. Also, check the curve of the rear drop housing edges. If it is square, they are IB drop housings, more rounded is the regular B housing. It sounds like you have some real detective work ahead of you to figure out what you really have.

Good luck and keep us posted.

Glenn

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pete

07-06-2004 03:31:21




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 Re: Re: Re: Re: Re: Model IB in reply to Glenn in PA, 07-05-2004 19:55:02  
I have an 'engine' number written down from a previous time: 2916-20AM. If this does not look like a valid number, can you tell me an approximate location on the engine to look for the correct number?



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Glenn in PA

07-06-2004 09:56:47




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 Re: Re: Re: Re: Re: Re: Model IB in reply to pete, 07-06-2004 03:31:21  
From Bryan Smiths website at Clemson, you have a 1948 engine. You may have an IB, with a replaced transmission case. How is the seat mounted? On a solid bar, or a series of leaf springs linked together?

Here is the Engine Casting number info

B / C / CA Engine Castings and Year Manufactured
Home

Here's something posted by Steve on the Yesterday's Tractors AC discussion board (posted on 1/20/02) that might help identify a tractor year if the serial number on the transmission is missing. This gives the year of manufacture of the engine - some tractors may have been assembled and given tractor serial numbers the following year, but at least this will get you in the ballpark for the year of your tractor. Edited slightly for clarity:

If you are sure there is no number stamped (and covered by paint), then the transmission failed in years past and was changed out with a new unit which had no number. If this is the case you can look at the engine behind the distributor for a casting number. It should be a cast number in the form of AM2916 - xx . The two digits at the end will tell you the approx year manufactured. 1938 is 10, 1939 is 11, etc, 1958 would be 30.

10 - 1938 17 - 1945 24 - 1952 11 - 1039 18 - 1946 25 - 1953 12 - 1940 19 - 1947 26 - 1954 13 - 1941 20 - 1948 27 - 1955 14 - 1942 21 - 1949 28 - 1956 15 - 1943 22 - 1950 29 - 1957 16 - 1944 23 - 1951 30 - 1958

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pete

07-07-2004 17:12:32




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 Re: Re: Re: Re: Re: Re: Re: Model IB in reply to Glenn in PA, 07-06-2004 09:56:47  
The seat mounting is a combination of leaf spring and coil spring: The leaf spring (a double layer) is "S" shaped, with the bottom of the "S" attached to the tractor and the top of the "S" stretched to the rear where the seat is attached. A coil spring is between the seat bottom and a rearward extension from the bottom of the "S".



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Glenn in PA

07-07-2004 18:46:50




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 Re: Re: Re: Re: Re: Re: Re: Re: Model IB in reply to pete, 07-07-2004 17:12:32  
That is the late style seat. Your transmission should have had an IB prefix and a number from 1-3500+. It appears that you have a swapped transmission from a 1939 tractor. (It's no big deal, as they are exactly identical, but it is always nice to have a good serial#) If you can research the history (ownership) of your tractor, maybe you could find the original case and rebuild it. If not, and you want an IB case, contact Roger VanCamp in Fort Wayne, IN.

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