Carter AVS questions

Fuel and Air Systems

  1. markfh

    markfh Well-Known Member

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    I have a 68 Dart GTS 340. I'm rebuilding the carburetor and my Carter AVS 4425S isn't exactly like those I see on the Internet. All the ones I see on the Internet have two idle adjustment screws but mine only has one as you can see in the images. The holes where it appears there should be two are plugged. Any idea why and is it unusual?

    Also, any idea what the H7 means? Is that the month and year of manufacture?

    carb 1.jpg

    carb 2.jpg
     
  2. rumblefish360

    rumblefish360 So close, yet so far away FABO Gold Member

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    That upper center knob is an air bleed to trim the carb a bit further. Handy if you want to super tune that carb for better operation over the standard carb.
     
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    • xLURKxDOGx

      xLURKxDOGx "An angel fat, at satan's feast" FABO Gold Member

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      I believe H7 means August of 67. The guys with the real knowledge will chime in I’m sure.

      Jake
       
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      • HemiSSDart

        HemiSSDart Dartus Interuptus

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        Yes, August 1967. The two 4425's I have are plugged too.
         
      • Mattax

        Mattax Just the facts, ma'am FABO Gold Member

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        What Rumblefish said is correct.
        The '68 Plymouth FSM covers the carb pretty well. The Dodge manual probably does too.
        This MTSC covers some of the unique features for carbs that year.
        1968 Chrysler Carburetor Service Highlights Service Book - Session 243

        One thing to keep in mind is by controlling the idle air bleed, only very fine adjustments can be made.
        The objective was to keep these cars idling at a relatively lean mixture (for idle).

        1968 Engine Performance Diagnosis (Session 250), Master Technician's Service Conference
         
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        • rumblefish360

          rumblefish360 So close, yet so far away FABO Gold Member

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          Whoaaaa, nice link BRO! I never knew that existed. Cooooooooolllllllll

          I had one for a spell. Nice carb. Once I realized what it did, I played with that thing like crazy. Drive me crazy a few times! LOL But, that was the finest running carb I had. Super sweet.
           
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          • Mattax

            Mattax Just the facts, ma'am FABO Gold Member

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            • A56

              A56 MoParAffliction

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              Sorry about the hijack ,just curious, is your car an automatic and is that the original carb? My 69 340 has the original carb A9 4611SA and is a 4 speed. I had a discussion with someone who has a 4611S and he said that was the 4 speed carb. Not sure what the A stands for.
               
            • A56

              A56 MoParAffliction

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              the two holes below the two plugged holes seem to be missing something

              overview.jpg
               
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              • 65Val

                65Val Average Length Member

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                Thats a different model AVS for a different application...there's nothing missing on the single screw AVS waaayyy up there^^^^^^. You'll probably find little grub screws/mixture screws buried in those wee holes. Each different model number denotes changes in the carbs design or calibration for different years or engines.
                 
              • markfh

                markfh Well-Known Member

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                No problem. Yes, it's an automatic and it is the original carb. At least I've had the car since 85 and I'm the 3rd owner and know the history of the car back to the first owner.
                 
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                • markfh

                  markfh Well-Known Member

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                  Yep, there are little grub screws buried in there.
                   
                • markfh

                  markfh Well-Known Member

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                  Thanks for all the responses and the info. As I continue to work on this car I'll have more questions. I'm sure.
                   
                • markfh

                  markfh Well-Known Member

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                  Okay rebuilt and seems the accelerator pump isn't pumping. I warmed up the engine and shut it down. When I manually actuate the linkage I see no jet of gas in the primaries. Is that the check valve under the pump?
                   
                • rumblefish360

                  rumblefish360 So close, yet so far away FABO Gold Member

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                  There is a check valve under the cluster. Depending on the year of the carb, it can be a shinny steel ball or a brass rectangle.

                  Not trying to be a jerk but you did install a new plunger right? And of course the rod with it.
                   
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                  • markfh

                    markfh Well-Known Member

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                    Yep. Replaced everything that came in the rebuild kit.

                    This one doesn't have the steel ball and I think I remember the brass rectangle. I'll open it up again and check.
                    Thanks
                     
                  • toolmanmike

                    toolmanmike FABO Staff Staff Member FABO Gold Member

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                    The A9 should be January 1969 built.
                     
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                    • A56

                      A56 MoParAffliction

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                      Thanx, It is January, car build date was 2/26 /1969. Engine build date was 12/16/1968
                       
                    • markfh

                      markfh Well-Known Member

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                      Found this document about rebuilding the AVS and my AVS didn't have the little discharge check needle shown in the image attached when I rebuilt it. Is this something I need or what?

                      Carter AVS discharge check needle.jpg
                       
                    • 65Val

                      65Val Average Length Member

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                      Every AVS/AFB I've rebuilt had one of those, or similar. I believe it blocks the passage that allows the accel pump well to suck fuel from the bowl, and not from the squirters.
                       
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                      • markfh

                        markfh Well-Known Member

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                        Oki doki. I'll order some since all I can find is a package of them. Need a power booster check valve seal as well.


                        Thanks
                         
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                        • markfh

                          markfh Well-Known Member

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                          One more question. Do you know what size that needle is? Seems there's more than one.
                           
                        • rumblefish360

                          rumblefish360 So close, yet so far away FABO Gold Member

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                          The needle as the check valve or the needle and seat needle?
                           
                        • 65Val

                          65Val Average Length Member

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                          Seems to me I've seen some rebuild kits come with one...don't remember which ones though.
                           
                        • 66fs

                          66fs Well-Known Member

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                          I may have a used one.
                           
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