RHD Carburettor

john charlton

john charlton

Well-known member
I fitted a regular Zenith to my RHD phaeton and found the choke lever fouled the two tooth steering box .An easy fix I just bent the area with the hole in it 45 degrees and problem fixed . I looked at English Kayce carbs and they do not have the extended lever with hole . I checked an English parts book ( 1931) and it shows A 9548 with no extension with the hole .I have an English instruction book which shows the lever with the hole this also shows the 7 tooth steering box so the lever does not foul the steering box .A later instruction book the lever with extension and hole is not shown this shows the 2 tooth steering box so RHD with a 2 tooth you dont get the lever with the hole in the end . So it seems with RHD and the 2 tooth box you cannot run a wire through the rad when you hand crank as it has the pre Dec 1928 lever . Just wondered why Ford did not bend the lever to clear the box or only not done in England .RHD drive in Australia any thoughts on this conundrum ???

John in RHD Suffolk County England .
 
Interesting, John. The April 1928 English Ford Service Bulletin photo shows it with the extension arm, as does the diagram in English FSB of April/May 1929. No mention or picture of it in the 1930s English FSB, but the Trafford Park Manchester Ford Parts list of Jan 1st 1930 lists it as A-8548 and shows it without the extension arm. May be an English idiosyncrasy or is it the same for all RHDs?
 
The English Service Bulletin for April 1928 does show the extension ,clearly pictured . The USA Service Bulletin has the extended lever introduced in December 1928 so 8 months later most odd . The English bulletins normally lag behind by some months . I am waiting to see who else responds in RHD land .

John in same place same weather
 
updraught said:
Lucky to find anyone with an original 2 tooth in Oz. 1930 they were still using the 7 tooth.
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That's right and no Model As came to Australia in 1931 so RHD 2 tooth steering boxes are like rocking horse $#!T. That said, I have one in three of my Model As - call me lucky.
In one of those cars, I have an engine that runs a lot better than the original. I run a B carburettor on that one and the intake fouls the 2 tooth steering box. I didn't want to cut away part of the front of the carburettor like they did in the day so I cut off the bottom of the intake manifold and reattached it after turning it slightly clockwise (from above). I had to put a small universal joint in the choke rod but it now works well after cutting off the lower part of the lever John mentioned in the first post.
I am at a loss to understand why Henry made such a mess of the design of the Model A when it comes to RHD. He had been making RHD Model Ts for many years but seems to have dropped the ball with the Model A.
 
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According to the Australian judging standards, both Zenith and Holley carbs did not have a lower choke arm at the start of production. The lower choke arm was added on approx September 1928 on both Holley and Zenith carbs. This also looks to line up with the change from double venturi to single venturi. Around August 1930, the arm was changed from brass to steel, both plain and cad plated.
 
As you still had the seven tooth then the lever with the hole would clear .The two tooth is bulkier so not enough room to clear . I think Bob C has the answer there is a RHD lever AF 9548 maybe it has a kink in it The two tooth came into English production in May 1930 and RHD AA trucks were built into 1936,thousands made very popular so RHD two tooth columns not difficult to find .

John in Suffolk County England no change in the weather .
 
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