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Thread: Solex Carburetor - Bedford QL

  1. #1
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    Default Solex Carburetor - Bedford QL

    Hi folks,
    Another question regarding my QL.
    It is fitted with a Solex RZFAIPO carburetor which has another number stamped underneath it, this being LJ57. I have a spare Carburetor and this has LK52 stamped on it.
    Does anybody know if these numbers mean anything important or are they like a batch or casting number?
    Thanks, Mark

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  3. #2
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    Default Re: Solex Carburetor - Bedford QL

    Quote Originally Posted by mark4974 View Post
    Hi folks,
    Another question regarding my QL.
    It is fitted with a Solex RZFAIPO carburetor which has another number stamped underneath it, this being LJ57. I have a spare Carburetor and this has LK52 stamped on it.
    Does anybody know if these numbers mean anything important or are they like a batch or casting number?
    Thanks, Mark
    There's nothing listed on those codes in the instruction book for the carb.

    That said, these carbs do come in different configurations, so you'll need to give it a good look-over before assuming it's identical. The governor is also pre-set, so I'd imagine it may need adjustment if it was intended for a different vehicle.

    Per the QL maintenance manual, you're looking for 35RZFAIPO with:
    29mm choke.
    135 main jet
    165 correction jet
    60 slow running jet
    200 starter jet
    150 slow running jet air bleed
    85 pump jet
    2mm needle jet

    If you need instructions on setting the governor, let me know.

    I'd imagine the number you are looking at could relate to a particular setup or intended vehicle, but I don't know for sure.
    Lessons learned from working with military vehicles, number 10 in a series. "Never tip the strange silver thing with hoses upside down over the toolbox. It will leak gunk."

  4. #3
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    Default Re: Solex Carburetor - Bedford QL

    Thanks for your reply.
    I know nothing about Carburetors and hate setting them up. I have 3 that came with the truck. The one that was fitted, one used and one new one.

    I was planning on putting the new one on but welcome any advice. Would it still be wise to overhaul it (I have a new kit) and any guidance on setting it up. I always seem to wing it and hope for the best 😬

    Thanks, Mark

  5. #4
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    Default Re: Solex Carburetor - Bedford QL

    Just a warning. The same carburettor fits a Ford V8 as well as a Bedford, but all the jet sizes are different. Make sure you have the correct one for your Bedford with the right jets.
    WOA2 is the name for Robert Davey from Reading.

    Ford WOA2 utility car
    Ford WOT2 truck

  6. #5
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    Default Re: Solex Carburetor - Bedford QL

    Quote Originally Posted by mark4974 View Post
    Thanks for your reply.
    I know nothing about Carburetors and hate setting them up. I have 3 that came with the truck. The one that was fitted, one used and one new one.

    I was planning on putting the new one on but welcome any advice. Would it still be wise to overhaul it (I have a new kit) and any guidance on setting it up. I always seem to wing it and hope for the best ��

    Thanks, Mark
    Hi Mark,

    The carb on the QL has fixed jets, so the only setting up you need to do is the idle mixture and tickover speed - even the governor is pre-set. If the engine ran ok on your old carb it should run fine if you re-fit it. If you fit the new one, just set the idle mixture by trial and error then adjust the tickover and away you go.
    Regards,
    Mike.

  7. #6
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    Default Re: Solex Carburetor - Bedford QL

    Quote Originally Posted by woa2 View Post
    Just a warning. The same carburettor fits a Ford V8 as well as a Bedford, but all the jet sizes are different. Make sure you have the correct one for your Bedford with the right jets.
    Robert,
    The British Ford V8 was fitted with the 40RZFAIPO carb, and the Bedford had the 35RZFAIPO carb, different choke tube sizes (ie 40mm and 35mm for aforementioned carbs), not the same carb.

    Correction ..... it was the Ford WOT1 crash tender that had the 40RZFAIPO, the WOA1 and other WOT models had the 35RZFAIPO
    Last edited by Richard Farrant; 19-05-2017 at 20:18. Reason: added words.
    Richard Farrant

    1943 Bedford QLD - 1941 BSA WM20 - 1943 Daimler Scout Car Mk.2
    MVT no. 1087 - IMPS no. 57 - AMVCS hon. member and Comms. officer
    KVE President and Newsletter Editor

  8. #7

    Default Re: Solex Carburetor - Bedford QL

    In my experience from changing carbs on the K9 the stamped number refers to the exact set-up of the carb, ie jet sizes etc, and so it would need to be the same as the original or have the jets etc changed.
    PT

  9. #8
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    Default Re: Solex Carburetor - Bedford QL

    I think that there is a slight difference between Bedford MW and QL carburettor but it is only around the fitting and engagement of the choke. I bought a new carb for my QL but had to use some parts from the choke system of the old QL carburettor.

    Guy.
    2 bsa foldingbicycles ,triumph 3hw 1944,bedford QL 1944, Morris C4 Wireless 1944 and a lot of post war triumph bikes.
    Bedford QLD, W&P 2013 show first price in the British vehicle over 5cwt categories

  10. #9
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    Default Re: Solex Carburetor - Bedford QL

    I'm fairly certain the the 35RZFAIPO came in different configurations for different vehicles (not just Bedford).

    40RZFAIPO as others have said, is for the Ford V8 (and possibly others as well).

    The jets are accessible from the outside of the carb, without need to strip it down.

    If you're feeling adventurous, there's a Solex instruction book called "Self-starting Solex Carburettor 35 & 40 RZFAIP downdraught governor type with accelerating device instruction booklet", this covers tuning. There's also some coverage in "British Solex Carburettors" published by Speedsport Motorbooks which is easier to find (out of print, but second hand). This indicates that the O in RZFAIPO indicates a zero starter, though I'm afraid I don't know what that means in practice.

    Otherwise just go with the Bedford manual

    Unfortunately none of the info I've found lists what the other stamped in letters and numbers mean (or which relate to what vehicles or configuration).
    Last edited by Lauren Child; 19-05-2017 at 19:28.
    Lessons learned from working with military vehicles, number 10 in a series. "Never tip the strange silver thing with hoses upside down over the toolbox. It will leak gunk."

  11. #10
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    Default Re: Solex Carburetor - Bedford QL

    Quote Originally Posted by Lauren Child View Post
    I'm fairly certain the the 35RZFAIPO came in different configurations for different vehicles (not just Bedford).

    40RZFAIPO as others have said, is for the Ford V8 (and possibly others as well).

    The jets are accessible from the outside of the carb, without need to strip it down.

    If you're feeling adventurous, there's a Solex instruction book called "Self-starting Solex Carburettor 35 & 40 RZFAIP downdraught governor type with accelerating device instruction booklet", this covers tuning. There's also some coverage in "British Solex Carburettors" published by Speedsport Motorbooks which is easier to find (out of print, but second hand). This indicates that the O in RZFAIPO indicates a zero starter, though I'm afraid I don't know what that means in practice.

    Otherwise just go with the Bedford manual



    Unfortunately none of the info I've found lists what the other stamped in letters and numbers mean (or which relate to what vehicles or configuration).
    Lauren,
    You are referring to a specific model of Solex carb, the 35RZFAIPO, there are only a small number of vehicle types use this particular specification and they would have jets to suit as well as a variation on the fixing for the Zero Starter cable.
    Vehicles this one was fitted to were;
    Bedford MW, OX, OY and QL
    Austin 3 ton 6x4
    Ford WOA1 and WOT range
    there may be others, but not show in in Vocab.

    As for the 40RZFAIPO, that was fitted to the Austin K5, Dennis tipper and Albion BY5 and FT11

    The letters each denote a feature of the particular carb and some engines will have a different combination of letters to others.

    To take an example of 35RZFAIPO
    35 denotes choke tube size (this is nothing to do with choke as in starting, it is the venturi so to speak.
    R Governor assembly incorporated in throttle tube
    Z Dustproof
    F Generic term relating to diecast carb.
    A Bi-starter
    I Downdraught
    P Pump accelerating device discharging straight into choke tube
    O Zero Starter

    You questioned Zero Starter, this is a device on the side of the carb with a disc valve in it operated by what you might call the cold starter cable ('choke'). It works with closed throttle.
    Richard Farrant

    1943 Bedford QLD - 1941 BSA WM20 - 1943 Daimler Scout Car Mk.2
    MVT no. 1087 - IMPS no. 57 - AMVCS hon. member and Comms. officer
    KVE President and Newsletter Editor

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