B tractor/engine serial # relationship
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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=28668
Printed Date: 22 Jun 2025 at 2:40pm
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Topic: B tractor/engine serial # relationship
Posted By: GBACBFan
Subject: B tractor/engine serial # relationship
Date Posted: 06 Apr 2011 at 5:34pm
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I believe DickL or someone posted this in the past, but i wasn't smart enough to save it or remember. On the B, what is the relationship between the AM number cast in the block, and the serial number of the tractor? As I recall this wasn't an exact science, but an indicator of how these match up.
Would someone please 'splain this again, or post the link to the earlier discussion? I cannot find it. TIA
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are genuine." - Mark Twain
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Replies:
Posted By: Chris/CT
Date Posted: 06 Apr 2011 at 6:40pm
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Go to clemson.edu, they have the tractor to engine #'s charts, they are not perfect, just aprx. calculations I think.
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Posted By: MNLonnie
Date Posted: 06 Apr 2011 at 6:55pm
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These would be the suffix #'s on the casting for B/C/CA.
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10 - 1938 |
17 - 1945 |
24 - 1952 |
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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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Waukesha B, B, IB, G, styled WF, D15, 615 backhoe, 2-Oliver OC3's, 4 Ford Model T's, 3 Model A Fords, AV8 Coupe, AV8 Roadster, 1933 Ford Wrecker
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Posted By: GBACBFan
Date Posted: 06 Apr 2011 at 7:19pm
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Thank you both. That is good information that I have now SAVED!
I know the casting # is over the frost plug, but where's the engine serial # on the BE?
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"The trouble with quotes on the Internet is that you can never know if they
are genuine." - Mark Twain
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Posted By: MNLonnie
Date Posted: 06 Apr 2011 at 7:35pm
On the back of the block just above the bell housing. Might be hard to see tucked in there.
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Waukesha B, B, IB, G, styled WF, D15, 615 backhoe, 2-Oliver OC3's, 4 Ford Model T's, 3 Model A Fords, AV8 Coupe, AV8 Roadster, 1933 Ford Wrecker
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Posted By: GlenninPA
Date Posted: 06 Apr 2011 at 7:38pm
As a point of interest, the first few hundred B's with the Allis engine actually have a -9 suffix, even though they are 1938 model year.
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Good judgment comes from experience. Experience comes from bad judgment.
From listening comes wisdom and from speaking comes repentance.
Wise men learn more from fools than fools from the wise.
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Posted By: CTuckerNWIL
Date Posted: 06 Apr 2011 at 9:27pm
And I have a 1951 CA#669 with a casting number ending in 26 and the engine has never been replaced according to my Dad, who bought it new, and the guy that did any engine work on the tractor at the dealership.
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Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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Posted By: MNLonnie
Date Posted: 06 Apr 2011 at 9:40pm
My 1951 CA#387 has a ending of 29 which would be 1957 but the engine serial is CE142532GA which is early 1951 so who knows, casting suffixes may not be all that accurate?
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Waukesha B, B, IB, G, styled WF, D15, 615 backhoe, 2-Oliver OC3's, 4 Ford Model T's, 3 Model A Fords, AV8 Coupe, AV8 Roadster, 1933 Ford Wrecker
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Posted By: Chris/CT
Date Posted: 06 Apr 2011 at 10:14pm
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I have found the list for the "CE" engines. MNLonnie, that engine serial number fit's right into the range for a 1951 CA tractor. I could not find those charts at Clemson website, did find a couple I had printed off Forum years ago. They use a mathematical equation of sorts to come up with this "chart/curve" to figure the relationship.
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Posted By: CTuckerNWIL
Date Posted: 07 Apr 2011 at 12:06am
I forgot to mention my 51 CA with the "28" casting number has a serial number dating it to early 51 also.
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http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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Posted By: MNLonnie
Date Posted: 07 Apr 2011 at 5:22am
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Is this the chart?
125 cubic inch "CE" engine
Equation: y = 1.5104x + 140532
or
x = (y - 140532)/1.5104
(y is the engine serial number, x is the tractor serial number)
Approximate engine sn based on tractor sn:
| Year |
Tractor SN Range |
Engine SN Range |
| 1950 |
14 - 321 |
140553 - 141017 |
| 1951 |
322 - 10538 |
141018 - 156449 |
| 1952 |
10539 - 22180 |
156450 - 174033 |
| 1953 |
22181 - 31423 |
174034 - 187993 |
| 1954 |
31424 - 32906 |
187994 - 190233 |
| 1955 |
32907 - 37202 |
190234 - 196722 |
| 1956 |
37203 - 38617 |
196723 - 198859 |
| 1957 |
38618 - 38976 |
198860 - 199401 |
| 1958 |
38977 - 39513 |
199402 - 200212 |
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Waukesha B, B, IB, G, styled WF, D15, 615 backhoe, 2-Oliver OC3's, 4 Ford Model T's, 3 Model A Fords, AV8 Coupe, AV8 Roadster, 1933 Ford Wrecker
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Posted By: Dick L
Date Posted: 07 Apr 2011 at 8:20am
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The 9" were cast in 1937. Those numbers only give the casting date not necessarily the tractor year of manufactur. That is where the serial number comes into play.
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Posted By: wbecker
Date Posted: 07 Apr 2011 at 11:44am
Chris, can you make a link to the Clemson site, I can't seem to find it. Thanks
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Allis B, IB, Low B, G, D10, JD M, 8KCAB, C152
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Posted By: CTuckerNWIL
Date Posted: 07 Apr 2011 at 1:48pm
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Here's a link to Bryan's site. http://people.clemson.edu/~wsmth/ - http://people.clemson.edu/~wsmth/ All kinds of info there.
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http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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Posted By: feltennova
Date Posted: 18 Aug 2011 at 5:00pm
First post in a long time.
I hate to show my newbie status, but where is the engine serial number stamped? On my '52 CA I found the following on the left/carb side of the engine just below the air cleaner oil cup: 8704PA. This is a stamping, not a casting, so I'm thinking this is the serial number??
Asking because I'm called NAPA looking for a thermostat. My sales guy asked what engine I have. He said some of them used a thermostat that was close enough to what a sbc used and suggested that I might be able to use one of those. I don't like to deviate from how the manu built it, but if this is a common and OK practice, then I will. Thoughts?
Sorry if I'm hijacking a serial number thread with a thermostat question. If it isn't a simple answer, I'll start a new thread...after searching the forums that is.
Thanks,
Bill
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Posted By: CTuckerNWIL
Date Posted: 18 Aug 2011 at 7:08pm
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I don't know about the T-stat. I put one on the CA about 6 years ago but I had the old one to match one up to. As for the engine number, you are missing the front end of it. It should start with CE and be between 156450 - 174033 for a 1952 CA. It could be 158704 or 168704 with the CE in front and the PA behind. The tractor number stamped by the shifter should be between 10539 - 22180 and have CA in front of it.
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http://www.ae-ta.com" rel="nofollow - http://www.ae-ta.com
Lena 1935 WC12xxx, Willie 1951 CA6xx Dad bought new, 1954WD45 PS, 1960 D17 NF
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Posted By: feltennova
Date Posted: 19 Aug 2011 at 3:14pm
Thanks for the help. The serial number for the tractor *appears* to be 11670. To get the exact number I need to get some of the paint off. At one point the tractor has another layer of the wrong color of orange brushed on. The first two digits are pretty clear (11XXX), but the rest is difficult to make out.
Went by an older couples farm today that use to own an AC dealership years back. They have a few parts left over. Determined there was a mid-year change on the thermostat. They had the 'short' one and I need the 'tall' one. Need to look around and find one.
Thanks again.
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Bill Felten
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