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Thread: The Solex B40 PA4IO-5a Carburetor thread!

  1. #31
    Join Date
    Jun 2016
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    Norway
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    Deleted
    Last edited by EISTO; 27th June 2016 at 12:56 AM. Reason: Reply was posted twice

  2. #32
    Join Date
    Jun 2016
    Location
    Norway
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    Hi Chris!
    Thanks for those kind words about Norway . Not to mention your observations about the jets.
    After reading your post we've made a small gasket to fit between the correction jet and the emulsion tube.
    We also had a closer look at all the jets and noticed that 3 out of 5 (including the correction jet) are a different size compared to the old ones. The Bearmach repair set we've used is supposed to be for the Series 2A 2.25L, but there are some strange differences.
    These are the old vs. replacement jet sizes:

    Part No............Name..........................Origin al size...........Replacement size
    __________________________________________________ ____________
    46...................Main jet.......................126..................... .150
    39...................Accelerator pump jet.....50........................60
    53...................Starter jet....................145......................14 5
    51...................Pilot jet........................60..................... ...60
    49...................Correction jet................?.........................180


    The correction jet is specified as being 175 or 185 in the parts catalogue. Shouldn't 180 then be OK?
    Our new main jet is far to big, the parts catalogue says 125 or 135. The pump jet is 65 according to the parts catalogue...

    For the main/pump jets, we an reuse the old ones until we get the correct sizes. We're not going to cross the Atacama in this one, so I guess the standard sizes are ok.
    Do you know of any good online shops that sell them?


    Thanks,
    Einar

  3. #33
    Join Date
    Nov 2014
    Location
    Sydney
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    G'day Einar,

    Firstly there is another thread that you need to read regarding the Solex B40 PAIO.
    "Series Land Rover Sub Forum Series III - fuel problems."
    I have posted detailed and accurate information about the Solex B40 there.
    (You have to check the original jet size holes with ground precision drill shanks)

    (Note.When I get a chance I will PM the site administrator and see if we can put these posts into a normal thread under this sticky.)

    Also I have mislead you regarding the seal between the Air correction Jet and the Emulsion tube by using the wrong wording.
    There is no seal required because it is metal to metal contact which effectively acts as a seal.
    However, thinking about your situation maybe a seal is required because you have repaired the spraying orifice and alignment could be a problem. I suggest you use a cigarette lighter to put carbon on the Air Correction jet and check the contact pattern to the emulsion tube first. Then maybe a thin (1mm) O ring could be used if required.

    Now regarding the jet sizes. Main jet is 150 as supplied by aftermarket.
    OMG . That's not a jet that's a hose!!!!.
    It is 480 sizes larger than 126. They go in 0.05mm increments and 0.025mm increments for main jets. Very hard to measure.!
    I can see because of the cold climate 126 (1.26mm hole) is needed.
    Use the original main jet and see how your fuel consumption goes.

    The air correction jet is normally 185. However, 180 will be OK as again because of the cold air, will give a slightly richer mixture.

    I would use the original accelerator pump jet.


    Because the Pilot Jet is aftermarket with the thick hex it may not seat on the nose of the jet.
    Use the original jet if it has a thin hex.
    There must be a gap between the brass hex and the casting.

    With aftermarket you have to check every detail against the original part and if different ASK WHY??!!!!!
    Hope this helps

    Chris

  4. #34
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    Jun 2016
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    Norway
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    Chris: A sincere thanks for all your help. I totally agree that these posts should be moved to a different thread. It would keep this one more compact and filled with general information rather than our specific issues.


    We have ordered new jets with specific requests as to sizes. I guess we'll have to take this step by step. First goal is to get the engine started, then we can start diagnosing the carb to see if we need to make adjustments to the jet sizes and determine whether our MacGyver-fix for the emulsion tube works.


    Best regards,
    Einar and Dag

  5. #35
    Join Date
    Jun 2022
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    Saint Louis MO USA (Via the UK)
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    Solex B40 PA10-6

    Good day to all and thanks for sharing the threads so far. I am in a bit of a pickle as I have rebuilt my Solex B40 PA 10-6 and the engine is not running as it should. I looked for a manual to help me understand which of the jets do what but could not see one. I did find a couple of rebuild kits and managed to piece together the new parts needed to rebuild it but now i have white smoke coming out the exhaust and not sure which screw/jet is the idle and which is which for that matter. I did count the revolutions before disassembling and matched them but something is not great. Any help on finding a manual to show what it what and what adjustment is needed would be champion...Thanks in advance for the help. I added a video and the clanging sound is the exhaust bracket not the engine so please discount that if you watch it.
    Some questions:
    1. What is the green electrical wire that connects to a lug on the carb in photo's 04 and 05? Where it connects on the carb has come loose and there seems to be a small ceramic collar with a spring inside.
    2. Where is the mixture screw? I think it is the one located behind the throttle lever and in front of the vacuum hose in photo's 02 and 03.
    3. Also the float valve I used in the rebuild had a slightly larger hole in it than the original, only by about a mm but still larger in comparison, will this have affected anything?

    Before I rebuilt it the engine ran clear with no smoke now i have white smoke coming out the exhaust, does that mean it's not getting enough fuel?

    Thanks
    Laters
    G


    Photo 01
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    Photo 02
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    Photo 03
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    Photo 04
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    Photo 05
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    Photo 06
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    Attached Images Attached Images

  6. #36
    Join Date
    Jun 2022
    Location
    Saint Louis MO USA (Via the UK)
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    Mixture Control Screw

    Quote Originally Posted by EISTO View Post
    Of course it is, how embarassing


    I'm getting a bit confused by the figure in my manual. There's something strange here. I decided to remove the tube, and there's no trace of an olive or screwed union (16 & 17 in below figure). The tube seems as if it was just pressed into the carb body. The hole is the same ID as the tube.
    My guess is that the screwed union has snapped just like Chris mentioned, and that what remains is so rusted that it just looks like grit.

    I guess Plan B is to either try to clean out the remains of the union screw or drill/thread a hole and fit the tube with a larger diameter union.....


    Einar
    Can anyone tell me how to set the mixture control screw on the solex b4 pa 10-6 How far should I screw it in? Does anyone know where the image shown in this thread of the exploded solex view comes from along with the detailed parts. I am trying to identify what does what and it would be really helpful?
    With regard to the copper tube, there should be a brass collar that allows it to fit to the carb, it comes from the distributor if memory serves me right.
    G

  7. #37
    Join Date
    Jun 2022
    Location
    Saint Louis MO USA (Via the UK)
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    Update

    Quote Originally Posted by GeorgeTheLandy View Post
    Can anyone tell me how to set the mixture control screw on the solex b4 pa 10-6 How far should I screw it in? Does anyone know where the image shown in this thread of the exploded solex view comes from along with the detailed parts. I am trying to identify what does what and it would be really helpful?
    With regard to the copper tube, there should be a brass collar that allows it to fit to the carb, it comes from the distributor if memory serves me right.
    G
    Okay, so I have adjusted the mixture screw according to the instructions in the manual, essentially screw all the way in, then screw out 1.5 turns and adjust while engine is running to correct idle. What happens now is when I push the throttle the engine stalls. The white smoke from the exhaust has gone, but now it stalls and still does not run smoothly.
    Any thoughts?
    Thanks
    G

  8. #38
    Join Date
    Apr 2023
    Location
    Christchurch new zealand
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    Hello
    can anyone tell me if the circled and arrowed parts of the Solex carburettor are removable and if so what’s the best way to do this.

    I am wanting to gently sand the base to ensure a flat service

    thanks
    Julian
    Christchurch
    NZ
    Attached Images Attached Images

  9. #39
    Join Date
    Jul 2009
    Location
    S.E.Qld
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    Only remove the tube if you think its absolutely necessary. It can be very brittle and is easy to break.
    Use one of the cover screws in place of the jet. Grip it with pliers and without wriggling or twisting pull straight up
    and hope someone hasn't tried it before you, damaged it and used Araldite.
    To remove the choke tube remove the grub screw and lift the tube out.
    Attached Images Attached Images

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