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Les Kerf 
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Joined: 08 May 2020
Location: Idaho
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 Topic: Allis Chalmers B project
Posted: 16 Feb 2026 at 11:50am |
 PeterVD wrote:
Does anybody know how much NM a CA spring pulls? Original ones not available |
My CA governor spring measures about 1.57 inches long in the resting position (outside to outside overall length).
When installed on the tractor with the throttle in the wide-open maximum stretched position it measures about 2.2 inches overall length.
Lacking a suitable scale with which to measure the NM, I contrived a means of fastening one end of the spring to a hook mounted in my bench vise, and then hung a bucket containing wheel weights on the lower end of the spring.
I added weights until the spring had stretched out to 2.2 inches, and then weighed the bucket on my doctor-type bathroom scale.
It required 17 pounds and 12 ounces to stretch the spring from the original 1.57 inches to 2.2 inches.
I shall leave it to someone else to do the conversion to SI units 
Your mileage may vary 
Edited by Les Kerf - 16 Feb 2026 at 11:51am
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PeterVD
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Joined: 11 Jan 2026
Location: Belgium
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Posted: 05 Feb 2026 at 10:38pm |
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Does anybody know how much NM a CA spring pulls? Original ones not available
Edited by PeterVD - 06 Feb 2026 at 12:23am
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Restoring a Allis Chalmers B
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Les Kerf
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Posted: 04 Feb 2026 at 7:22pm |
PeterVD wrote:
I think the governor spring became a little old/weak.
I have read that is possible tot replace it by the spring for a CA, to gain a little bit of RPM/ speed.
Is this correct? |
Yes.
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PeterVD
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Posted: 04 Feb 2026 at 6:30pm |
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I think the governor spring became a little old/weak.
I have read that is possible tot replace it by the spring for a CA, to gain a little bit of RPM/ speed.
Is this correct?
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Restoring a Allis Chalmers B
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
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Posted: 25 Jan 2026 at 9:40pm |
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everyone sets them cold.... normally add a couple thousandths to the HOT value... .25mm is .010 inch... normally set them at .012 inch or .30 mm
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Like them all, but love the "B"s.
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PeterVD
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Posted: 25 Jan 2026 at 9:34pm |
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Different sites give different instructions for setting the valve lash, one says 0.25 mm cold, another says 0.25 mm hot... whitch one is right?
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Restoring a Allis Chalmers B
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steve(ill)
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Posted: 25 Jan 2026 at 7:51pm |
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changing the hand throttle to a foot throttle would not be too hard... having BOTH is a litte more complicated becase the hand throttle is at a FIXED position and you want the FOOT FEED to over ride that... IE, the spring.
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Like them all, but love the "B"s.
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steve(ill)
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Posted: 25 Jan 2026 at 7:47pm |
the INDUSTRIAL MODEL , IB , had a foot accelerator.... couple extra parts and a spring loaded over ride foot feed on the hand throttle......
there is a guy on this site that makes foot feeds for "D" series tractors... might be something to look at... I think its Tracy ??
Edited by steve(ill) - 25 Jan 2026 at 7:49pm
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Like them all, but love the "B"s.
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PeterVD
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Posted: 25 Jan 2026 at 5:28pm |
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Is there a possibility to add a foot accelerator on the B ?
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Restoring a Allis Chalmers B
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Trinity45
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Posted: 19 Jan 2026 at 5:29pm |
PeterVD wrote:
I'm Peter, 54 years old and located in Belgium.I started a rebuild project together with my 18 year old son, an Allis Chalmers B It runs and drives, but not as it should, so we got a little bit of work in the future It's already converted to 12 Volt When I find out how I will post some pictures on the forum
I don't know if this works:
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Best of luck, I have a working B with mounted cultivators we use in sweet corn.
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steve(ill)
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Posted: 19 Jan 2026 at 4:24pm |
that model is popular in the USA, but was not used on the Alllis..... Several sites list the carb..
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Like them all, but love the "B"s.
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PeterVD
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Posted: 19 Jan 2026 at 3:02pm |
wjohn wrote:
That is a Zenith, but I have never seen that style on a B. If you look at where it mounts to the manifold, it looks smaller than it should be. I wonder if it came off of something else and is not the original carburetor... Unless that is what Bs
built in the UK used? |
According tot Google the UK build B's have a Zenith 24T2 carb, and mine looks like it think https://www.da7c.co.uk/technical_torque_articles/zenith_24t2_carburettor.html
Edited by PeterVD - 19 Jan 2026 at 4:12pm
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Restoring a Allis Chalmers B
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wjohn
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Posted: 19 Jan 2026 at 8:20am |
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That is a Zenith, but I have never seen that style on a B. If you look at where it mounts to the manifold, it looks smaller than it should be. I wonder if it came off of something else and is not the original carburetor... Unless that is what Bs built in the UK used?
Edited by wjohn - 19 Jan 2026 at 8:23am
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1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45
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Gary Burnett
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Posted: 19 Jan 2026 at 7:45am |
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Zenith
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PeterVD
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Posted: 19 Jan 2026 at 6:31am |
No letters/numbers on the carb, can anyone tell me if this is a Zenith or a Marvel Schebler carb?
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Restoring a Allis Chalmers B
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DiyDave
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Posted: 18 Jan 2026 at 8:07pm |
PeterVD wrote:
DiyDave wrote:
PeterVD wrote:
steve(ill) wrote:
YEP... sounds like your doing GREAT !! |
Thanks Steve I only have one small problem with it now, the choke has to stay a little bit closed to keep it running, when I open the choke completely the motor drops dead I hope a good clean of the carburator will help |
Or the felt air seals for the choke shaft... |
Do you have a parts number for the felt air seals please? Is it any of these:
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It looks like they are there, the 2 items to the right of the gold colored shaft... 
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Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need!
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steve(ill)
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Posted: 18 Jan 2026 at 6:43pm |
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you can normally grab the arm on the shaft and try to WOBBLE IT... If you got a couple thousandths clearance, thats OK... If you got 30 thousands clearance, you could be sucking air around the shaft...Also a leaking manifold gasket can do that.... But i would agree with you that 90% of the time it is a partially plugged main jet / crud in the carb.
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Like them all, but love the "B"s.
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PeterVD
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Posted: 18 Jan 2026 at 4:00pm |
DiyDave wrote:
PeterVD wrote:
steve(ill) wrote:
YEP... sounds like your doing GREAT !! |
Thanks Steve I only have one small problem with it now, the choke has to stay a little bit closed to keep it running, when I open the choke completely the motor drops dead I hope a good clean of the carburator will help |
Or the felt air seals for the choke shaft... |
Do you have a parts number for the felt air seals please? Is it any of these:
Edited by PeterVD - 18 Jan 2026 at 4:05pm
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Restoring a Allis Chalmers B
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DiyDave
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Posted: 18 Jan 2026 at 3:43pm |
PeterVD wrote:
steve(ill) wrote:
YEP... sounds like your doing GREAT !! |
Thanks Steve I only have one small problem with it now, the choke has to stay a little bit closed to keep it running, when I open the choke completely the motor drops dead I hope a good clean of the carburator will help |
Or the felt air seals for the choke shaft...
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Source: Babylon Bee. Sponsored by BRAWNDO, its got what you need!
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PeterVD
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Posted: 18 Jan 2026 at 3:24pm |
steve(ill) wrote:
YEP... sounds like your doing GREAT !! |
Thanks Steve I only have one small problem with it now, the choke has to stay a little bit closed to keep it running, when I open the choke completely the motor drops dead I hope a good clean of the carburator will help
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Restoring a Allis Chalmers B
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steve(ill)
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Posted: 18 Jan 2026 at 12:55pm |
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YEP... sounds like your doing GREAT !!
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Like them all, but love the "B"s.
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PeterVD
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Posted: 18 Jan 2026 at 11:31am |
Today put a new condenser in the magneto, adjusted the timing, new spark plug wires and new spark plug, sounds ok I think
Edited by PeterVD - 18 Jan 2026 at 11:32am
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Restoring a Allis Chalmers B
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steve(ill)
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Posted: 15 Jan 2026 at 4:53pm |
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no, there is no RPM indicator for the B tractors.. You would have to get an aftermarket unit that counts PULSES on a 4 cylinder engine..... nobody really worries about the RPM much... not a big deal in the long run.
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Like them all, but love the "B"s.
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PeterVD
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Posted: 15 Jan 2026 at 4:49pm |
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Is there a Rev counter that works with the Fairbanks Morse FM Magneto?
And how do you connect it?
Edited by PeterVD - 15 Jan 2026 at 4:50pm
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Restoring a Allis Chalmers B
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steve(ill)
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Posted: 13 Jan 2026 at 7:44am |
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there are a couple guys on here from the UK. Mark Everett comes to mind. Dont see him post much, but comes to read routinely.. He would be a LOT BETTER at giving you more details on this tractor..
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Like them all, but love the "B"s.
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steve(ill)
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Posted: 13 Jan 2026 at 7:27am |
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England imported some tractors and then some "KITS" to build theirself. I dont know the full story, but your right.. some had English serial numbers... I think they tried to use some parts made in the UK... You might have LUCAS starter / generator ... and some parts might look Similar, but be Different than a US made tractor.
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Like them all, but love the "B"s.
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PeterVD
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Posted: 13 Jan 2026 at 7:21am |
steve(ill) wrote:
Peter, that serial number in the 10,000 range would be a 1938.. Your tractor has a battery box, generator and starter motor... General appearance would make you think it was built several years later than that.. Maybe your missing a digit ? The serial number is by the gear shift lever ... B- XXXXXX... the front wheel / rim was different on the 1938- 49 tractors... yours looks like the standard 5 bolt automotive type rim that was common on the later tractors..
In the US, the NGK plugs are more common among Allis users of the smaller engines.... Since you have the Champs, give them a try... the might be OK..
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I think I might have an Englisch build (EB) version  The letters are not visible on the block Englisch build 1953 B's have serial numbers between EB9200 and EB11120 (That's what I find on the internet)
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Restoring a Allis Chalmers B
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PeterVD
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Posted: 13 Jan 2026 at 7:15am |
Les Kerf wrote:
Nice tractor! Is the small black box just below the steering arm the battery? Your generator and electrical looks different than the US versions.
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It has been converted from 6 Volt to 12 Volt
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Restoring a Allis Chalmers B
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steve(ill)
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Posted: 12 Jan 2026 at 1:24pm |
Peter, that serial number in the 10,000 range would be a 1938.. Your tractor has a battery box, generator and starter motor... General appearance would make you think it was built several years later than that.. Maybe your missing a digit ? The serial number is by the gear shift lever ... B- XXXXXX... the front wheel / rim was different on the 1938- 49 tractors... yours looks like the standard 5 bolt automotive type rim that was common on the later tractors..
In the US, the NGK plugs are more common among Allis users of the smaller engines.... Since you have the Champs, give them a try... the might be OK..
Edited by steve(ill) - 12 Jan 2026 at 1:27pm
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Like them all, but love the "B"s.
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Les Kerf
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Posted: 12 Jan 2026 at 1:06pm |
Nice tractor! Is the small black box just below the steering arm the battery? Your generator and electrical looks different than the US versions.
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