Part Identification

Discussion in 'General' started by jeff kjoller, Sep 2, 2019.

  1. jeff kjoller

    jeff kjoller New Member

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    On a CM91 carb: Does anyone know how to make the two metal fuel line ports stay in place? When I pull on the gas line it actually pulls the port out of the carb body. I tried using a hammer and gently tapping it but that did not make it seat any better. See photo (thanks to "northvancpf" whom I borrowed part of this image from).

    ports.jpg
     
    #1 jeff kjoller, Sep 2, 2019
    Last edited: Sep 4, 2019
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  3. cjpayne

    cjpayne Well-Known Member

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    Thin film of JBweld? Gorrila glue?
     
  4. racerx

    racerx Administrator
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    Epoxy might be the answer...a high-quality product like Devcon, which I believe is now sold under a different brand name. Success will depend upon preparation. The surfaces must be perfectly clean.

    But...before resorting to epoxy, I'd try the press-fit method, as was used by the manufacturer, one more time.

    Lightly polish the brass fittings with a fine Scotchbrite pad. Then put them in the freezer. Heat the carb casting, gently. 130-140F (the point at which it gets too hot to hold onto) is plenty. With the casting hot (expanded) the fittings cold (contracted) tap each one home, using a plastic mallet or scrap of lumber. Get them firmly seated. Once the temperatures equalize, the press fit should be as tight as possible. If it works, you're good-to-go. If it fails...time for the epoxy.

    FWIW I've had good luck with press-fitting these back into place with CT70 carbs.
     
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  5. jeff kjoller

    jeff kjoller New Member

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    thanks all for advice.
     

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