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B carb rebuild

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2011dandd View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 2011dandd Quote  Post ReplyReply Direct Link To This Post Topic: B carb rebuild
    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
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Leon n/c AR. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Leon n/c AR. Quote  Post ReplyReply Direct Link To This Post 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
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Alberta Phil View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Alberta Phil Quote  Post ReplyReply Direct Link To This Post 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.
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chaskaduo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote chaskaduo Quote  Post ReplyReply Direct Link To This Post 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?
1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp
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2011dandd View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 2011dandd Quote  Post ReplyReply Direct Link To This Post 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.
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HoughMade View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote HoughMade Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 2019 at 5:09pm
Mine is a '51 and has the nonadjustable jet.  It's original.
1951 B
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chaskaduo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote chaskaduo Quote  Post ReplyReply Direct Link To This Post 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.


Edited by chaskaduo - 07 Mar 2019 at 6:01pm
1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp
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Steve in NJ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve in NJ Quote  Post ReplyReply Direct Link To This Post 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
39'RC, 43'WC, 48'B, 49'G, 50'WF, 65 Big 10, 67'B-110, 75'716H, 2-620's, & a Motorhead wife
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2011dandd View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 2011dandd Quote  Post ReplyReply Direct Link To This Post Posted: 08 Mar 2019 at 5:55am
I will hopefully be able to get the part number from the carb later today!
Thanks everyone
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2011dandd View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 2011dandd Quote  Post ReplyReply Direct Link To This Post Posted: 08 Mar 2019 at 10:34am
Hi
An update on the id plate number

The two numbers on there are

212844 and 9706
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chaskaduo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote chaskaduo Quote  Post ReplyReply Direct Link To This Post Posted: 08 Mar 2019 at 11:21am
My list has that as a 1941 B or C kerosene or low grade fuel.
1938 B, 79 Dynamark 11/36 6spd, 95 Weed-Eater 16hp, 2010 Bolens 14hp
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2011dandd View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 2011dandd Quote  Post ReplyReply Direct Link To This Post 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
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Gerald J. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Gerald J. Quote  Post ReplyReply Direct Link To This Post 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

Gerald J.
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