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The Little A-Cs - Chapter 6

This book was written exclusively for Yesterday's Tractors Magazine. It is not published in any physical form but only available on this site. No part of this text may be used in any form other than as provided electronically from www.yesterdaystractors.com without express written consent of Yesterday's Tractors. Copyright 1996-1998.

View the table of contents.

6. Identifying Numbers

One of the first things that some people want to know and others need to know is what model and year their tractor is. The historical significance and even the value may depend on the serial number and resulting identification that comes with it. Additionally, it may be necessary to get the correct parts and in some cases return the tractor to its original state. Without the knowledge of when it was built this would be quite impossible.

In all cases (excepting the early IB), this series can be definitively identified by looking on the right upper transmission casting, just ahead of the shift  lever, for the tractor serial number. This serial number will begin with B, IB, C, or CA.  If you have an IB but the serial number shows it to be a B, it would indicate that this is one of the pre-1946 Bs that have their serial numbers buried in the B range (the year will still be accurate in that range). If you find that you have a C or B but the serial number shows the opposite, it would unfortunately indicate that the transmission case has been replaced with a used case.

The following serial number list was provided by making slight modifications to a list provided by a major wholesale 3rd-party tractor parts manufacturer (TISCO). This list is basically the same as that used by tractor parts dealers to aid in providing the correct parts to customers.

Serial Numbers

Year          B            C            CA            IB             
1937          1            N/A          N/A          N/A       
1938          101          N/A          N/A          N/A       
1939          11800        N/A          N/A          N/A       
1940          33394        1            N/A          N/A       
1941          49721        112          N/A          N/A       
1942          56782        12389        N/A          N/A       
1943          64501        18782        N/A          N/A       
1944          65502        23908        N/A          N/A       
1945          70210        30695        N/A          N/A       
1946          72301        36168        N/A          1001     
1947          73370        39168        N/A          1003     
1948          80056        51515        N/A          1010     
1949          92295        68281        N/A          1282     
1950          102393       N/A          14           1556     
1951          114528       N/A          305          1879     
1952          118674       N/A          10395        2219     
1953          122310       N/A          22181        2570     
1954          124202       N/A          31424        N/A       
1955          124711       N/A          32907        N/A       
1956          126497       N/A          37203        N/A       
1957          127186       N/A          38618        N/A       

The engine number is located on the left rear casting of the engine block. The engine number will start with BE, CE, or CR. If your C has a BE engine, it was likely a replacement, if your B has a CE engine and appears to be prior to 1946, this also was likely a replacement.  If you have a tractor with a CR engine, it definitely indicates that it was replaced. All C and CA machines used the CE engine.

There may be a date located on engine block at the upper right front. This is a date of manufacture but is predominantly found on the earlier engines. The latest date I have found thus far  was dated 1943 on a stationary BE engine originally sold to the US Navy.

In discussing the serial number with a former AC Dealer in Oregon, I discovered that it was possible to come up with a tractor that did not have a serial number. Indeed I own one such example. The reason was that replacement transmission cases were shipped without serial numbers and and it was the dealers responsibility to restamp the original number on that case. If the dealer did not take the time to do this, the tractor would be un-numbered for all time. The machine we have could still be identified as a 1940 B based on casting marks on the engine.

Prev Page  Table of Contents   Next Page
1. Introduction
2. What are they?
3. History in Brief
4. Competing Tractors
5. Appearance
6. Identifying Numbers
7. Similarities and Differences
8. Cosmetics: What did they really look like?
9. Tips, Tricks and Maintenance
10. Using the Little Allis'
11. Tune-up Data, Quantities, and Specifications

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