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  • secondary circuit diaphragm

    My secondaries won't kick in. I removed the cover to the secondary diaphragm, managed not to lose the spring. Looking at a shop manual, there doesn't LOOK to be anything to HOLD ON TO the diaphragm assembly. But, while the edges seemed willing to come away from the main body, it felt like something was hung up behind the middle of the diaphragm. I sure didn't want to pull it unless I knew whether or not there was supposed to be a resistance. The shop manual shows a pivoting bar attached to the secondary operating rod with one end in the chamber behind the diaphragm - is that connected somehow?
    Matthew
    1959 HT
    Matthew 1959 Indian Turquise Hardtop
    Tbirdregistry RegistryNumber=13517
    http://www.tbirdregistry.com/viewdatasheet.aspx?RegistryNumber=13517

  • #2
    RE: secondary circuit diaphragm

    You are right, from the shop manual diagram it does not look like the lever has an attachment point to the secondary diaphram. I have a spare Ford 4100 carburetor - the stock type used on 352 engined Squarebirds. I will take it apart some time this week and look to see how this secondary diaphram operates.

    Alexander
    1959 Hardtop
    1960 Golde Top
    Alexander
    1959 Hard Top
    1960 Golde Top
    sigpic

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    • #3
      RE: secondary circuit diaphragm

      http://www.squarebirds.org/carbureto..._secondary.jpg

      The secondary operating diaphragm is shown in the right upper corner of the picture above. The pin facing downwards slips into the hole in the lever as shown in the diagram of the 4100 carburetor. If you look closely, you can see the hole in the lever. The pin from the diaphagm does not shift in the lever hole because the diaphragm is held in position by the four cover bolts.

      Alexander
      1959 Hardtop
      1960 Golde Top
      Alexander
      1959 Hard Top
      1960 Golde Top
      sigpic

      Comment


      • #4
        RE: secondary circuit diaphragm

        Thank you, Alexander,

        The shop manual diagram showed what LOOKED like a loop in that pivoting arm. Since you were able to show me the BACK of the diaphragm, I can see it DOES hook on to something (the loop) and which way to pull it - UP, I believe!

        Matthew
        Matthew 1959 Indian Turquise Hardtop
        Tbirdregistry RegistryNumber=13517
        http://www.tbirdregistry.com/viewdatasheet.aspx?RegistryNumber=13517

        Comment

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