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Thread: Weber Carb 40 DCOE throttle linkage at idle speed screw

  1. #1
    Registered User dawg7's Avatar
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    Default Weber Carb 40 DCOE throttle linkage at idle speed screw

    I bought these from a acquaintance type who said the car was running fine with these carbs. They have been sitting for two years. I am getting ready to install them and came across the linkage issue. My question is how come two of three carbs don't have the throttle linkage no where near the idle speed screw? The throttle plates of those two are open as far as the linkage is from the screw. I can't find the adjustment procedure in all the literature I downloaded from this site. All I have figured out is the throttle shaft hits the accelerator pump rod. I appreciate the help!


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    74 260Z RLS30-016515 12/73
    3.1 Stroker; Weber 40DCOE; 5 sp
    225/50/15 BFG gForce on Konig Rewinds

  2. #2
    Supporting Member Zedyone_kenobi's Avatar
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    A starting point would be this. You need to find the progression hole cover screw.

    Number 5 in this picture


    You want to crank the adjsutment screw so that it touches the tang starts to open the butterflies to the point where you have the first progression hole completely covered up, but with any throttle movement you start to uncover them.

    Look at A in this picture.



    Once you get them all just like that so they hard stop at this position, you are in a position to get the car started. ANd the REAL fun with webers will start!

    This is just a picture for education on function
    1971 240Z HLS30-38691
    93.9% done and getting better every day
    Now with 100% more DATSUN SPIRIT L28 Power
    1968 Datsun 2000 SRL311-03416

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    Registered User LeonV's Avatar
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    Check your throttle return springs, they may not be there or are disconnected.
    2/74 260Z

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    Registered User dawg7's Avatar
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    Default accelerator rod

    I took the tops off and look at the accelerator pump rod assy....they are stuck; won't move. The other carb's rod assy is free and I can lift it up and it drops freely. The return springs are ok. I put a few drops of Marvel Mystery oil on the rods...

    edit...these are 40DCOE -18s

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    Last edited by dawg7; 07-23-2013 at 10:00 AM.

    74 260Z RLS30-016515 12/73
    3.1 Stroker; Weber 40DCOE; 5 sp
    225/50/15 BFG gForce on Konig Rewinds

  5. #5
    Registered User LeonV's Avatar
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    Quote Originally Posted by dawg7 View Post
    I took the tops off and look at the accelerator pump rod assy....they are stuck; won't move. The other carb's rod assy is free and I can lift it up and it drops freely. The return springs are ok. I put a few drops of Marvel Mystery oil on the rods...

    edit...these are 40DCOE -18s
    There you go!

    Installing stiffer throttle return springs would be a good idea and now would be an easy time to swap them. There's a thread about them with a part number on this site.

    EDIT: here's the link - http://www.classiczcars.com/forums/c...al-spring.html
    Last edited by LeonV; 07-23-2013 at 11:21 AM. Reason: Added link
    2/74 260Z

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    Registered User dawg7's Avatar
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    thanks for the link.....hope the mystery oil solves the stuck rod. Yeah have fun with that line.....

    74 260Z RLS30-016515 12/73
    3.1 Stroker; Weber 40DCOE; 5 sp
    225/50/15 BFG gForce on Konig Rewinds

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    It was the accelerator rod sticking. Yanked em out and gave them a good cleaning. Now to get some new gaskets and such then put everything back together. Oh and will get the stronger return springs! Thanks LeonV and Zedyone_Kenobi!!!

    74 260Z RLS30-016515 12/73
    3.1 Stroker; Weber 40DCOE; 5 sp
    225/50/15 BFG gForce on Konig Rewinds

  8. #8
    Registered User LeonV's Avatar
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    Quote Originally Posted by dawg7 View Post
    It was the accelerator rod sticking. Yanked em out and gave them a good cleaning. Now to get some new gaskets and such then put everything back together. Oh and will get the stronger return springs! Thanks LeonV and Zedyone_Kenobi!!!
    Good stuff. The only favor we ask in return are pictures and a video when you're done.
    2/74 260Z

  9. #9
    Registered User TBone028's Avatar
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    My friends during my DCOE rebuild were patience, multiple cans of carb cleaner, and taking a lot of time to set float levels. Your carbs look way cleaner then what I started with! My trials and tribulations are here: Weber DCOE's installed | Initial impressions - Nissan L6 Forum - HybridZ

    If you were considering switching to a throttle cable, my parts list and side-project are on page 2 of the thread, post #23. Good luck with the DCOE install...you'll wish you had done it sooner!
    1972 240Z - 3.1L with some goodies
    1974 260Z - SOLD!

  10. #10
    Nova Scotia,Canada,Earth Blue's Avatar
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    Quote Originally Posted by TBone028 View Post
    My friends during my DCOE rebuild were patience, multiple cans of carb cleaner, and taking a lot of time to set float levels. Your carbs look way cleaner then what I started with! My trials and tribulations are here: Weber DCOE's installed | Initial impressions - Nissan L6 Forum - HybridZ

    If you were considering switching to a throttle cable, my parts list and side-project are on page 2 of the thread, post #23. Good luck with the DCOE install...you'll wish you had done it sooner!

    Tbone... could you please post the details in the articles section of this web site? I get a malware warning at Hybridz and it would help many others.
    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.


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  11. #11
    Registered User TBone028's Avatar
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    Blue, I will have to try and submit the article later. I kept getting database errors and gateway timeouts when I tried to post. And its weird about HybridZ and malware...for years I never had a problem with the site. Then 2 weeks ago I started getting notifications as well from my antivirus.
    1972 240Z - 3.1L with some goodies
    1974 260Z - SOLD!

  12. #12
    Nova Scotia,Canada,Earth Blue's Avatar
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    yeah, I think their site got poisoned.
    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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