Carburetor Question

[Dan Hiebert]

I have been looking for a carburetor kit for our '48 D24.  It has been about thirty years since I rebuilt it, with an occasional thorough cleaning in the interim.  Meaning not removed, but the exterior thoroughly cleaned with carb cleaner and lubricated where appropriate, and adjustments checked with so far never a need to tweak anything.  Until two years ago I've had absolutely no problems with it (didn't run the car at all last year) when the car began to be difficult to get started after it had been driven.  After the initial "normal" spring start up this year, it has been difficult to get started all the time, yet runs quite well once it gets running.  It may be coincidence, but this all started after I put a new fuel filter in it, somewhat bigger than what I had been running.  

 

Reading the "hard start" threads, I want to rebuild the carb.  I have not removed or disassembled it because I haven't found a matching kit.  Here's the rub, the carb in our D24 is marked BXUV-3, rather than BXVD-3, and the carb number is 3-77.  I have found kits for "BX series" carbs, but then the numbers don't get below 3-82.  It is my understanding that "3" indicates the carb was built for Dodges, and "77" is the sequential application or model number, meaning it was the 77th version of that carb.  Outwardly, it looks exactly like a BXVD carb, but I know the differences would be internal.

 

Do any of you sage individuals know whether or not a BX compliant kit will work on this carb, even though the model number doesn't exactly match?  I imagine the main things I will need will be the leather accelerator pump piston, the gaskets, and the float needle, so this may be like playing with hand grenades...close will be OK?  I haven't paid a whole lot of attention to past discussions on the different carburetor topic, because I didn't need to at the time, and until today didn't know I had a different carburetor than normal.  I haven't exhausted all sources, yet, but that difference in numbers is throwing my searching off, and I wanted to ping you'uns for advice before I get frustrated.

 

The filter wasn't in a good place, so I removed it altogether.  It was still hard to get started, but there was no fuel in the line from the carb to the pump.

 

 

[Semmerling]

How about this? Send them a message.

 

https://www.ebay.com/itm/401380303625

Edited May 18, 2023 by Semmerling

[Dan Hiebert]

I had seen that, but the model numbers listed still didn't match.  I haven't gotten to the contacting vendors point just yet.  Thanks for the heads up! 

[gwaggonercpa]

As a wise man once said--this may or may not help:  I think the writer is still in business and sells kits,  https://thecarburetorshop.com/

 

STROMBERG DOWNDRAFT CARBURETORS

By 1928 Stromberg was using code letters and numbers to distinguish carburetor types. The following table can be used with Stromberg downdraft carburetors. Examples are shown in curly braces {}. These codes can also be applied to the SF and SFM series updraft carburetors.

First letter is the series designation

Second and subsequent letters (with examples)
First letter repeated – duplex (two-barrel) {EE-1}
B – revision of AAV {AAUVB-2}
D – built-in dashpot {BXVD-3}
E - electric controlled dashpot {BXVES-3}
O – oversize barrel {BXO-2}
P - vacuum actuated accelerator pump {AAVP-2}
R - revision to existing type {DDR-3}
S - kickdown switch incorporated {AAVS-2}
U – undersize throttle barrel {BXUV-3}
V – vacuum controlled power system {AAV-26}
X – cross flange {BXOV-2}

First number represents S.A.E. flange size 1 thru 5. Size 1 is a 1 inch carburetor. Each subsequent size is incremented by 0.25 inch.

Second number
5 – Electric automatic choke {BXOV-25}
6 - Hot air automatic choke {AAV-26}

Third Number
7 – Stromberg starter switch incorporated {AAUVB-267}

Exceptions to the above
AAOV-1 and AAO-161 are known exceptions. Also the four barrel used on 1952 thru 1954 Buicks is designated 4A.

Series of downdraft carburetors in chronological order beginning in 1928 D, E, A, B, W

Additionally, carburetors were coded as to customer starting in 1935. Each major customer was assigned a code number {2=Ford, 3=Dodge…252=Rolls-Royce}. This code number with the sequential carburetor number was then stamped somewhere on the carburetor. Replacement or universal carburetors were assigned code number 1. Some of these are not stamped. Also, some carburetors sold to Ford were not stamped. An example on a stamped identification would be 7-95 which means 1953 Buick series 50. An engineering change would then cause a letter to be appended to the number. There were two revisions to 7-95. The first was coded 7-95A; The second was coded 7-95B.

Prepared by Jon Hardgrove, The Carburetor Shop LLC, 204 East 15th Street, Eldon, MO 65026

[Dan Hiebert]

15 hours ago, Semmerling said:

How about this? Send them a message.

 

https://www.ebay.com/itm/401380303625

That particular kit was not correct for my carburetor, but they do have the correct one.  Thanks again!