gloh
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Posts: 9
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Post by gloh on Jan 13, 2016 20:52:26 GMT -5
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Post by Scoutpilot on Jan 14, 2016 4:58:03 GMT -5
What you have there is either a 431 or 853 “Universal” carburetor. Since they could be put many engines, of different displacements, it has that Hi-Speed circuit adjustment needle. Not standard for a CJ-2A carb, the 431S was an export carb for Austin Motors in Britain. Its later iteration, the 853S was deemed a “Universal” carburetor model and used on many different motors. Here’s a link to a conversation we had four years ago on the CJ2A page. Sean posted a link to the spec sheet for it.
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gloh
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Posts: 9
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Post by gloh on Jan 15, 2016 22:23:43 GMT -5
Great, thanks for the info. I just got this jeep and am anxiously awaiting spring to get it on the road. The previous owner ran it all summer last year, and I don't think he had any issues with the carb. From what I read on the CJ2A page about it, it works just as well as the stock carb. Thanks again for the help. This is my first Willys and I am having one hell of a blast with it.
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gloh
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Posts: 9
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Post by gloh on Aug 9, 2016 21:15:23 GMT -5
OK, So I have identified this carb as a 431. I used the fact sheet and compared some of the dimensions of the metering rod and main venturi, pump jet # and low speed jet #. I have engine stall issues on right turns at idle due to the gas in the float bowl sloshing to the left. I adjusted the Float level to 1/2" as per manual. Did not help. Now, the question I have is why does this carb even work on my CJ2A, as the fact sheet says it is for 45 to 75 cubic inch motor. I mean I can't complain, the engine runs great. Idles nicely, and I get it up to about 50 MPH max. Am I losing out on anything with this carb? Should I get myself a 596s?
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Post by Scoutpilot on Aug 10, 2016 4:01:06 GMT -5
OK, So I have identified this carb as a 431. I used the fact sheet and compared some of the dimensions of the metering rod and main venturi, pump jet # and low speed jet #. I have engine stall issues on right turns at idle due to the gas in the float bowl sloshing to the left. I adjusted the Float level to 1/2" as per manual. Did not help. When you adjusted the float, was that adjustment checked with the gasket off? Another thing to consider is this. With the tank in a low fuel condition, it is possible to uncover the “J” tube fuel pickup in the tank and suck air. Another possibility is a very low idle RPM. 650-700 RPM is recommended. Now, the question I have is why does this carb even work on my CJ2A, as the fact sheet says it is for 45 to 75 cubic inch motor. I mean I can't complain, the engine runs great. Idles nicely, and I get it up to about 50 MPH max. Am I losing out on anything with this carb? Should I get myself a 596s? The Model 853, its first cousin, was designed for European motors up to 130CI. As long as you are having no major issues the only reason to change to a 596S is for peace of mind.
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gloh
New Member
Posts: 9
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Post by gloh on Aug 10, 2016 11:59:59 GMT -5
Yes, the float adjustment was done with the gasket off. I had your video on at the same time. Yeah, if I had the 853 the specs seems closer to the 596. However, With the measurements I got, I do not think it is the 853 but the 431, and that is why I adjusted the float to 1/2". But maybe it is the 853 and I need to adjust the float to 3/8". I can see the 853 working but would a 431 work also?
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Post by Scoutpilot on Aug 10, 2016 12:50:44 GMT -5
No. The 431 wouldn’t. 70CI is the biggest motor it is capable of running. I just mounted an 853 Body on a 596 throttle. Float is set at 3/8”. It runs great. A road test went well. I’m looking into the possibility of using these in a high altitude (6000’ MSL+) application since the high-altitude metering rod is no longer available.
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Post by rickg on Aug 10, 2016 13:07:30 GMT -5
Not to hi-jack but I'm intrigued!!
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Post by Scoutpilot on Aug 10, 2016 14:37:21 GMT -5
I haven’t forgotten you, rickg. Video real soon.
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Post by Scoutpilot on Aug 10, 2016 16:13:58 GMT -5
#1 is a 636SA I built from spare parts. #2 is the 853/596 combo experiment.
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gloh
New Member
Posts: 9
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Post by gloh on Aug 11, 2016 21:37:29 GMT -5
OK, so there are 3 sections to the carb, the body flange ass'y (mine is marked 235 S), the float bowl section (mine is marked 0-607) and the air horn ass'y (mine is marked 6-291 with a circled C and R). The pump jet part # stamped is 48-80, this would correspond to the 431. The low speed jet ass'y is marked 11-166S, also 431 part #. So my question is what carb is this? or what parts are from where?
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Post by Scoutpilot on Aug 12, 2016 3:49:31 GMT -5
Let me do some genealogical research. European Export came after the war and that’s when Carter’s product line seemed to expand exponentially.
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Post by jeffwho on Aug 12, 2016 10:40:26 GMT -5
This is a very interesting thread - it'd be a good idea to ID mine as well
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Post by Scoutpilot on Aug 12, 2016 10:55:10 GMT -5
Jeff. Pictures and all of the numbers you have available will be a great help. I’ll do my best.
Gloh. I’m still working on yours.
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gloh
New Member
Posts: 9
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Post by gloh on Aug 12, 2016 17:55:29 GMT -5
I just verified a few more part numbers off the carb. Here are all the numbers I found along with the carter part # in brackets. Body flange assembly = 235 S (1-236S) Low speed jet assembly = 11-166S (11-166S) pump jet = 48-80 (48-80) Metering rod jet assembly = 120-135S (120-135S Float bowl assembly = 0-607 Air horn assembly = 6-291 (6-292S) All the above carter part #'s are specific to the WO 431S, SA and SD According to the fact sheet this shouldn't work with this engine.
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