Farm Equipment - B carb rebuild

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B carb rebuild

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=158833
Printed Date: 24 Sep 2024 at 5:29pm
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Topic: B carb rebuild

Posted By: 2011dandd
Subject: B carb rebuild
Date Posted: 07 Mar 2019 at 10:10am

Hi guys
Finally got around to rebuild the carb on the b.
I was wondering if anyone could explain something for me please. I have the zenith carb on mine and instead of having a main jet adjustment mine simply has the plug. I have no idea why ? Cheers folks hope someone can make sense of this

Replies:

Posted By: Leon n/c AR.
Date Posted: 07 Mar 2019 at 10:22am

On my Zenith B carbs the plug is where you can remove or swap main jets, could also be used to drain carburetor fuel bowl. Leon

Posted By: Alberta Phil
Date Posted: 07 Mar 2019 at 1:49pm

Many of the earlier 'B's had the non-adjustable power jet with the plug. The later models seem to all have the adjustable one.

Posted By: chaskaduo
Date Posted: 07 Mar 2019 at 4:56pm

What year is the B, and what is the carb # on round brass tag riveted to the top of the carb?

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1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp

Posted By: 2011dandd
Date Posted: 07 Mar 2019 at 5:01pm

1947 English built b supplied with American parts.
It’s a dual fuel, ie petrol /tvo.
I need to inspect the identification plate better as some pleb has painted it in the past.

Posted By: HoughMade
Date Posted: 07 Mar 2019 at 5:09pm

Mine is a '51 and has the nonadjustable jet. It's original.

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1951 B

Posted By: chaskaduo
Date Posted: 07 Mar 2019 at 6:00pm

OEM Stock 1947 4 125 B (Kerosene) Zenith 161J7 906 216937-2 is what I find for your carb.

I believe it is type 161J7 model 906 part 216937-2.

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1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp

Posted By: Steve in NJ
Date Posted: 08 Mar 2019 at 5:23am

Some model Zeniths have a "fixed" jet with the plug. These were designed specifically for certain early model Tractor applications. Some, of those (depending on their P/N) can be upgraded to the later cousins that have the adjustable enrichment jet feature. I've upgraded a few customer Carbs, but I have to go by the P/N in my Zenith book.

Steve@B&B

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39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife

Posted By: 2011dandd
Date Posted: 08 Mar 2019 at 5:55am

I will hopefully be able to get the part number from the carb later today!
Thanks everyone

Posted By: 2011dandd
Date Posted: 08 Mar 2019 at 10:34am

Hi
An update on the id plate number

The two numbers on there are

212844 and 9706

Posted By: chaskaduo
Date Posted: 08 Mar 2019 at 11:21am

My list has that as a 1941 B or C kerosene or low grade fuel.

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1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp

Posted By: 2011dandd
Date Posted: 08 Mar 2019 at 11:36am

A 1941 b ? Really
I thought it was a 1947 I will have to check the tractor serial number now to see if that also tally’s up with a 1941 could have had a carb swap at some point though I guess.

Thanks

Posted By: Gerald J.
Date Posted: 08 Mar 2019 at 3:47pm

Should be carburetor details in the shop manual:
http://geraldj.networkiowa.com/Trees/Allis-Chalmers-G-B-C-CA-Service.pdf" rel="nofollow - http://geraldj.networkiowa.com/Trees/Allis-Chalmers-G-B-C-CA-Service.pdf

Gerald J.