B/C Gas and Tractor Fuel Carbs
Printed From: Unofficial Allis
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=28325
Printed Date: 01 Mar 2025 at 10:12am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: B/C Gas and Tractor Fuel Carbs
Posted By: wjohn
Subject: B/C Gas and Tractor Fuel Carbs
Date Posted: 01 Apr 2011 at 9:08am
Were the tractors with Zenith 9XXX carbs designed for use with tractor fuel, and the ones with 10XXX designed for gas? I was curious since my B (engine SN 14540G) has a 10698. My spare carb from a C with a kerosene manifold is a 9705.
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1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45
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Replies:
Posted By: wjohn
Date Posted: 01 Apr 2011 at 5:06pm
Bump?
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1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45
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Posted By: Hubert (Ga)engine7
Date Posted: 01 Apr 2011 at 8:44pm
Dad ran his '48 WD on both gas and tractor fuel with out making any carburetor adjustments. But I think you may be correct thinking that the older carburetors were designed for tractor fuel. Maybe someone more knowledgeable than I can give a definite answer.
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Just an old country boy saved by the grace of God.
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Posted By: Steve in NJ
Date Posted: 04 Apr 2011 at 8:05am
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Most Zenith's would run on either fuel without much adjustments. HTH
mailto:Steve@B&B - Steve@B&B
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Posted By: wjohn
Date Posted: 04 Apr 2011 at 5:49pm
I figured they had to, otherwise you'd have to adjust the carb every time you used a different fuel. That would be kind of a pain haha! It seems that the 9XXX and 10XXX carbs (taken from the number on the tag, they're both Zenith Models 61 or 161) were very similar but must have some parts differences since the rebuild kits are different. Maybe the 10XXX was optimized for gas only? Again, I'm just guessing, but there had to be some reason that AC used the two different series... maybe the 10XXX just superseded the 9XXX and I'm looking into this too much.
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1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45
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Posted By: GlenninPA
Date Posted: 04 Apr 2011 at 8:21pm
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61 and 161 denote the body style. The different number on the tags show which carbs have differences in the sizes of the internal jets, vents and venturi. You can get all the details from the Dealer Parts Manual for the B and C.
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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: wjohn
Date Posted: 04 Apr 2011 at 10:51pm
Alright, thanks Glen. I'll have to pick up a copy of that manual someday. Do you happen to know if there was any rhyme or reason for a particular tag number of carb for a certain tractor? I. e. the 10698 on my '39 B (which may not be the original carb). Or was AC just using whatever was available at the time.
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1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45
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Posted By: GlenninPA
Date Posted: 05 Apr 2011 at 7:23am
The dealer part Manual is available online at AGCO. In there, it lists the carbs in order, but gives no reference as to when they were used. As the openings get bigger, I assume it was to give more fuel flow, hence more power. I'm just guessing though.
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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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