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Thread: Hitachi SU Carb Jet Alignment Tool DIY for Datsun Nissan 240z

  1. #1
    Nova Scotia,Canada,Earth Blue's Avatar
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    Default Hitachi SU Carb Jet Alignment Tool DIY for Datsun Nissan 240z

    I am rebuilding carbs and did the dreaded "Loosen the 19mm jet lock nut" without realizing it was a bit of trial and error to realign: (Well the secret is to push the jet up into a lowered needle while slowly turning twisting the 19mm along its axis [like screwing on a bottle cap rather than wrenching. If you know about the "T" handled socket for turbo rebuilding then you know what I mean..nudge nudge wink wink say no more say no more... What's it like?]). So tonight, even though I aligned the jet by the above method, I decided I would try to find/make/invent a tool at the ACE hardware store.

    Plan A
    My first idea was to find a screw that would fit in the jet then turn the head using a file and electric drill. No luck finding anything smaller than 3mm (which happens to be the diameter of the needle securing hole in the piston). Well Plan A -1 was to turn brass rod on a lathe but I don't have one! lol

    Plan B
    Next I looked at rivets and found one that would do but there was still a little play in the jet as the shaft of the rivet was a little too small. Then I went and looked at the stock rod and a solution was found:

    Plan C

    The Parts:
    Click image for larger version. 

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    As you can see, the stock hollow brass tubing is what I used. The sizes are 1/8" inch and 3/32".

    Click image for larger version. 

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    The cost was very favourable as well.....well a bit more than a rivet or screw but hey ~$3 is mighty fine for a specialty tool. I might add that this is the only special tool I know of that is needed to easily rebuild SU carbs.



    How Each Part Works:

    Click image for larger version. 

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    The bigger 1/8" (3.18mm) tube fits snugly into the piston.


    Click image for larger version. 

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    The smaller 3/32" (2.38mm) tube fits very well into the jet nozzle.


    Click image for larger version. 

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    The smaller 3/32" tube also fits nicely into the 1/8" rod


    So to make the tool, I cut an 8mm length of the 1/8" rod. Slid it on a 50mm length of the 3/32" rod then soldered them together.

    Some sanding of the solder and a little off the 1/8" rod (3.18mm to 3.00mm) completed the job.

    Click image for larger version. 

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    The completed tool below a jet nozzle.

    Click image for larger version. 

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    Here is the tool in the piston.


    Click image for larger version. 

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    Here is the jet fitted by the tool.


    If you don'd have a clue what I am talking about then take apart an SU carb's jet assembly


    Enjoy!
    Last edited by Blue; 08-04-2011 at 09:02 PM.
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


  2. #2
    Registered User 5thhorsemann's Avatar
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    Neet widget, are you planning to sell them?

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    We have a jet centering tool available for sale left over from the Scott days. Don't think we've sold two in ten years.

    Anyway kudos for your inventiveness.
    Bruce Palmer
    Salem Or
    Sales@ztherapy.com
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    503-587-9800

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    I reviewed my design and I am about to make a mk-II version lol.

    Horseman, PM me your address and I'll send you one.

    Bruce, yeah I hear you. There are not a lot of geeks tearing up SU's these days.
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


  5. #5
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    Prior to a total redesign wouldn't that be a MK-1 MOD-2?
    Bruce Palmer
    Salem Or
    Sales@ztherapy.com
    www.ztherapy.com
    503-587-9800

  6. #6
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    Total redesign This change rate is worse than Apple's iPhone versions lol.

    Now off to ACE hardware. Stay tuned.
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


  7. #7
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    Default SU Jet Alignment Tool Mark II for Datusn / Nissan 240Z Carb

    Mark II is $0.43.

    It should be better than Mk-I because it aligns the nozzle guide directly rather than aligning it through the nozzle. This reduces the error/slop that exists between the nozzle and the guide.

    It consists of one 1/8"dia X 3/4" metal pin and one 1/4" dia X 23/32" long nylon spacer with 0.110" ID.

    Just tap the pin part way into the nylon spacer and that is it.

    Click image for larger version. 

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    Mk-II Parts: Steel Pin and Nylon Spacer


    Click image for larger version. 

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    The nylon spacer fits in the jet nozzle guide.

    Click image for larger version. 

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    The steel pin fits into the piston's needle hole.

    Click image for larger version. 

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    All three parts aligned


    Ace parts 44237-C (nylon spacer) and 58011-K (steel pin)


    Now to finish a front differential mount to put Ron Tyler's design, complexity and cost to shame.
    Last edited by Blue; 08-05-2011 at 11:39 AM.
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


  8. #8
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    Good grief man! $.043 each? I'm here to tell ya Ztherapy is ruined, I tell you, ruined!!

    Sell every one the western world wants to buy and you'll maybe have lunch money. Such is normally the case with these niche market tools..... Oh, don't forget the ad budget...... nyuck nyuck
    Bruce Palmer
    Salem Or
    Sales@ztherapy.com
    www.ztherapy.com
    503-587-9800

  9. #9
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    Only folks on ClassicZCar.com can see these "Technical Articles" so you are ok for now

    Off to ACE again for another project.


    Hey, I'm the guy who made front bearing drifts from $2 cast iron pipe fittings.... I must have Russian blood in my veins.

    Last edited by Blue; 08-05-2011 at 04:12 PM.
    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


  10. #10
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    Default Mark II alignment tool in action



    Click image for larger version. 

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    There is scarcely anything in the world that some man cannot make a little worse, and sell a little more cheaply.
    The person who buys on price alone is this man's lawful prey.


    John Ruskin (1819 - 1900)



    ZCars in Eastern Canada seaport ready for shipment to Europe

    http://ZSportCanada.com


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