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Carburetors - Carter W0

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sean View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sean Quote  Post ReplyReply Direct Link To This Post Topic: Carburetors - Carter W0
    Posted: 01 Nov. 2007 at 9:07pm
4 carburetors were used on CJ2A over the years:
Group 12-04 -- Carburetor
p/n 640304:  Carter WO, type 596s  -  up to s/n 69589
p/n 643337:  Carter WO, type 636S  - after s/n 69589 up to s/n 212110
p/n 647744:  Carter WO, type 636SA - after s/n 212110
p/n unknown:  Carter WO, MB type, type unknown - rarely used when others were unavailable
The 596S would accommodate only King-Seeley and Monarch governors.  The 636S/SA worked with the Novi as well.

The 636S and 636SA are physically identical.  The only difference of note is the nozzle and retainer plug inside.

This is a 636.  S or SA unknown at this time (click for enlarged versions):

        

        

 

The throttle body casting number is "I-458".  This is the same on all 3 CJ carbs.

 

The base flange stamped number is "505" on a 636S/SA, and "458" on a 596S.  This is only visible with the carb removed from intake manifold.

The butterfly shaft link has 3 screw holes:
  • screw is placed in upper hole for use w/King-Seeley or Monarch  governors
  • screw is placed in middle hole for use w/out governor
  • screw is placed in lower hole for use w/Novi governor

 

    

The Model 596S is virtually identical to the 636.  The only functional difference is in the throttle linkages (thanks Mike G!):

    

The arrows point out the 2 different links, and the governor screw hole: remove screw for use w/King-Seeley or Monarch governor.

An MB carb has a distinctly different throttle linkage:

    

Some documentation, all PDFs:

Carter Factory Datasheet:  CJ-2A W0 models 596/636

Carter Factory W0 Service/Rebuild Procedures

MB/CJ-2A Interchangeable Parts

Sean


Edited by sean - 01 Feb. 2010 at 7:40pm
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Josh Roberson View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Josh Roberson Quote  Post ReplyReply Direct Link To This Post Posted: 09 Dec. 2008 at 11:28am
I have a stamped 636s carb with a throttle body casting similiar to what is shown. The difference being that mine is stamped 13 versus the 16 that is shown above.  Do you know what this # represents? It is shown in picture #5 above and to the right of I-458.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dennisanvil Quote  Post ReplyReply Direct Link To This Post Posted: 09 Dec. 2008 at 12:37pm
somebody correct here was the w/o carter carb the only carb. use on the cj2a willys ?  the solex carb has been talk about but i was wonder  about the carter . thanksConfusedConfused
dennisanvil                   1948 cj2a, maker of tailgate hooks & hand forge iron ware
there not any knowen cure for jeep fever.
serial # 164136<
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Josh Roberson View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Josh Roberson Quote  Post ReplyReply Direct Link To This Post Posted: 09 Dec. 2008 at 2:42pm
According to the mechanics manual published by Willys-Overland Motors, Copyright 1948, Carter Type 596S and Carter Type 636S is the carburetor for the CJ2A.  Keeping in mind this was copyrighted in '48 it makes sense that the 636SA was introduced after the printing of this manual.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jus*Jack Quote  Post ReplyReply Direct Link To This Post Posted: 09 Dec. 2008 at 7:21pm
Dennis: The Solex is an after-market change made by various Jeep owners for many reasons. I've got one on one of my Jeeps, and it runs great, but there are often problems with fuel pressure if the switch is made. A Solex requires a lower pressure, from what I understand, and some folks have had to install a pressure regulator to solve the problem. I don't have that on mine, but my fuel pump may well have a lower output pressure to begin with, since it's probably been changed out prior to my owning the Jeep.
Seeya!

<Jack>

'48 CJ2A 197207 "Junebug"

'48 CJ2A 191237 "Turquoise"
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dennisanvil Quote  Post ReplyReply Direct Link To This Post Posted: 09 Dec. 2008 at 9:44pm
thanks for all the help. when i rebuilt my w/o carter  i brought a kit from napa.they was surpize to find one in stock and on the shelf . they tought that they was aother use for that kit so the was trying to cross check it but couldn`t. i was wonder if there was another carb. from a differant car that could be use on a l-134 engine.
dennisanvil                   1948 cj2a, maker of tailgate hooks & hand forge iron ware
there not any knowen cure for jeep fever.
serial # 164136<
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sean View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sean Quote  Post ReplyReply Direct Link To This Post Posted: 10 Dec. 2008 at 12:19pm
Josh:
Quote I have a stamped 636s carb with a throttle body casting similiar to what is shown. The difference being that mine is stamped 13 versus the 16 that is shown above.  Do you know what this # represents?
That number is cast, not stamped, but I have no idea what it represents.  I have another that is cast "7".

Dennis:  there are lots of discussions about "other" carbs that can be used on CJ-2A.   Try a search, and/or post your questions over in the "Tech Q&A" section.

Sean
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dennisanvil Quote  Post ReplyReply Direct Link To This Post Posted: 10 Dec. 2008 at 3:31pm
thank for the head  up
dennis
dennisanvil                   1948 cj2a, maker of tailgate hooks & hand forge iron ware
there not any knowen cure for jeep fever.
serial # 164136<
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Howard Quote  Post ReplyReply Direct Link To This Post Posted: 31 Jan. 2010 at 11:25am
This is a 636sa that was in a box as a new one. I think it is more likely a rebuilt new one...Sean, for spotters guide purposes, What exactly is the difference in the 636s and sa models? Can we see it?measure it? 
 


Edited by Howard - 31 Jan. 2010 at 11:29am
Howard F Jewett

1946 CJ2A #23353

43 GPW 106505 USA #20366014

43 Bantam Trailer T3 #14844
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sean Quote  Post ReplyReply Direct Link To This Post Posted: 01 Feb. 2010 at 11:33am
Nice Howard!  I'd have to say that's either an exceptionally well preserved NOS carb, or superbly restored.

Leaning more towards NOS - still has the ID tag which typically isn't reused on a rebuild, and throttle body not re-painted, still original black oxide, but degraded.

636S & 636SA changes are internal, so they can't be physically distinguished by external clues.  The only different parts are the nozzle, retainer plug & gasket.

Sean
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Howard Quote  Post ReplyReply Direct Link To This Post Posted: 01 Feb. 2010 at 4:28pm
Do you have the Carter Lists that distinguish these differences?
Or are you referring to the Willys Parts list by part number? It gets a little tedious to follow the CJ parts list for these carbs...
It would be cool to have the actual Carter Lists posted here for these carbs by Carter Model number....
This one actually came to me in a Sears box, probably 1970's vintage. I may still have the box....John, The Carb Shop, suggested a rebuilt on the one I show because of the use of aluminum plugs instead of brass. I do not know....
The triangular ID tags can be had...
Also, FWIW, there was a difference in the TPI count on one of the plugs also different compared to an earlier carb I have. And an aluminum one installed on this carb was the wrong TPI but forced into place into the threads on the body...Angry...minor damage only. But it suggests a reproduction or aftermarket part.
I have/had several WO carbs for comparison purposes and parts etc.
No worries.
Thanks.


Edited by Howard - 01 Feb. 2010 at 4:51pm
Howard F Jewett

1946 CJ2A #23353

43 GPW 106505 USA #20366014

43 Bantam Trailer T3 #14844
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Post Options Post Options   Thanks (0) Thanks(0)   Quote sean Quote  Post ReplyReply Direct Link To This Post Posted: 01 Feb. 2010 at 7:53pm
Howard:
Quote Do you have the Carter Lists that distinguish these differences?
Yeah.  It's been posted before, but they're lost in the ozone now!  Just put new links at the bottom of the original post

Quote ....John, The Carb Shop, suggested a rebuilt on the one I show because of the use of aluminum plugs instead of brass. I do not know....
Hmmm, I've been under the impression that Carter stopped using brass around the end of the war.

Regardless, if that's a "rebuild", someone went to great time & effort to get every little detail correct!  That's far beyond the typical rebuild.

Quote The triangular ID tags can be had...
Where?

What does your tag read?  I'm curious, cause I see no patent numbers on the bowl.  From what I understand, the Zenith manufactured carbs didn't include patent numbers, but the tags read "Z636S" or "636Z", can't recall offhand.

Sean


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Howard Quote  Post ReplyReply Direct Link To This Post Posted: 02 Feb. 2010 at 9:58am
Thank You, Those Carter Drawings are exactly what I was looking for! Now added to my library too! I don't care for this ID tag...it is stamped 1942 as well as 636SA...that can't be correct.(?) Another suspicious clue as to originality...I think Ron has the ID tags in one of his plastic small parts boxes...I can not remember...but they are/were out there


Edited by Howard - 02 Feb. 2010 at 10:00am
Howard F Jewett

1946 CJ2A #23353

43 GPW 106505 USA #20366014

43 Bantam Trailer T3 #14844
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hamhog Quote  Post ReplyReply Direct Link To This Post Posted: 09 Mar. 2010 at 7:27pm
I've got the same one, nos.  It came with the original sales receipt with a date of May 1977.
Dave

...looking for a late '46 or early '47 CJ2A to restore.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ed1johnson Quote  Post ReplyReply Direct Link To This Post Posted: 10 Apr. 2010 at 11:56pm
The carb looks like a rebuild because it has a steel adjusting screw instead of the original brass.
If I don't have it I will help find it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tbssic Quote  Post ReplyReply Direct Link To This Post Posted: 31 Dec. 2010 at 4:39pm
Exactly what I was looking for.......... Thanks sooooooo much.........
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Post Options Post Options   Thanks (0) Thanks(0)   Quote clark2334 Quote  Post ReplyReply Direct Link To This Post Posted: 11 Mar. 2011 at 9:20pm

Quote SEAN wrote:

4 carburetors were used on CJ2A over the years:
Group 12-04 -- Carburetor

p/n 640304:  Carter WO, type 596s  -  up to s/n 69589
p/n 643337:  Carter WO, type 636S  - after s/n 69589 up to s/n 212110
p/n 647744:  Carter WO, type 636SA - after s/n 212110
p/n unknown:  Carter WO, MB type, type unknown - rarely used when others were unavailable

Thanks for sharing these information SEAN! Wink  Just what I'm looking for. 
By the way, where's the best place to get these carburetors?
 


Edited by clark2334 - 11 Mar. 2011 at 9:22pm
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