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Thread: "How To" - Repairing a broken Temperature Gauge Capilary Tube/Line

  1. #1
    Registered User bertfam's Avatar
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    Thumbs up "How To" - Repairing a broken Temperature Gauge Capilary Tube/Line

    Here's an interesting "do it yourself" article on how to fix a broken temperature gauge capilary tube/line. Although the article was written for a Chrysler product, the theory should apply to any mechanical temperature gauge including the 190SL. Since my gauge is broken where the line goes into the capilary, I'm going to give this a shot. Of course, the 190SL didn't come with a protective spiral covering, so I won't be using this part. And since Mechanical Temperature Gauges can be had at your local auto parts store for around $10.00, if this works, it'll be well worth the price.

    Ed
    Last edited by bertfam; 12-01-2005 at 12:35 AM.

  2. #2
    Administrator wpuryear's Avatar
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    Ed,

    I fixed mine in a similar manner but waited until all repairs were made before injecting ether. The ether was introduced through a small hole in the bottom of the bulb after the solder was removed. Quanitity I don't believe is critical - I went for half full and used dry ice to slow evaporation. Fabricate a short brass wedge or spike similar to a sewing needle for the initial seal, then quickly apply a solder blob to the pre-tinned surface.

    Walt P.

  3. #3
    Registered User bertfam's Avatar
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    Walt,

    Where did you get the ether?

    Ed

  4. #4
    Administrator wpuryear's Avatar
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    From a friend's lab, so indirectly, a lab supply house.

    Walt

  5. #5
    Registered User bertfam's Avatar
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    Is ether something any "Joe" can buy off the street, or do you need some kind of permit?

    Ed

  6. #6
    Registered User M. Herrmann's Avatar
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    Ed, even as anesthesiologist here in CA I don't have any ready access to ether. Because of its flammability and abuse potential, it is restricted in availabilty. It is probably only available through a lab supply company to a legitimate source. When I did my research work years ago, we had all sorts of it around and I used it all the time to anesthetize rats before I transplanted them. However, we always did this under a special ventilation hood because it vaporizes quickly and the fire risk. Had I known I could have used it now for auto repair, I would have kept a few cans around!!! Makes me wonder if the much safer vapors we use today would work instead, but that would take some calculations and trials. Might want to check animal or veterinarian supply places-for some odd reason they seem to be able to just about any drug/agent for animals that we can't get for humans!!!

  7. #7
    St. Louis Ray
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    Would the ether in auto starting fluid work?

  8. #8
    Registered User bertfam's Avatar
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    Might be cheaper and easier to just do what the article says and use a new gauge for the "donor" parts.

    Ed

  9. #9
    Administrator wpuryear's Avatar
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    "Ethyl Ether" has the correct vapor pressure/temperature properties. The starter fluid on my shop shelf contains diethyl ether, heptane, and hexane.

    Walt P.

  10. #10
    Registered User bertfam's Avatar
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    Walt,

    So you're saying the starter fluid won't work?

    Ed

  11. #11
    Administrator wpuryear's Avatar
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    At least the starter fluid I have will not. When I return home I'll post the charts for a few ethers.

    Walt

  12. #12
    Administrator wpuryear's Avatar
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    A pressure/temperature chart of four ethers -

    Walt
    Last edited by wpuryear; 12-08-2005 at 06:03 PM.

  13. #13
    Registered User bertfam's Avatar
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    Walt,

    You're link doesn't seem to work.

    Ed

  14. #14
    Administrator wpuryear's Avatar
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    I was trying to save long load times for slow connections. Oh well, here goes:
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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