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Thread: Help - Bosch Snail Horn Restoration

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  1. 12-12-2017, 09:50 AM #1
    tom1394racing
    tom1394racing is offline
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    Help - Bosch Snail Horn Restoration

    I am attempting to restore the Bosch snail horns for my 70E project. The two I have reserved for the project vibrate and hum when I apply my 12 volt/3amp power supply but no horn tone.

    I took a 3rd horn I have in my stash to do a practice restoration before I tackle the more pristine horns I have saved. This 3rd horn did nothing when I applied power to it so I dissembled it, cleaned it up and used my wife's nail file to clean the contacts. I then checked to make sure the electromagnet, the switch contacts and diaphragm all worked properly after I adjusted the contact position using the adjustment screw on the back of the horn body. I could not figure out how to remove the resonator plate from the main snail body so I was only able to clean the inside surface. After reassembly, this 3rd horn vibrates and hums just like the other two but still no horn tone. I then took an unused aftermarket snail horn, that had been sitting for 10 years plus, from my stash and tried it on my power supply. At first it hummed and vibrated just like the other three but then I gave it a firm knock and it sounded off a horn tone and continued to perform correctly afterwards. No such luck with a knock on my original Bosch horns.

    Take a look at my photos. What am I missing? I am guessing that it must be something in the resonator plate that is stuck. Any suggestions on how to remove it without destroying the snail body?
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    Tom Butler
    1973 RSR Clone
    1970 911E
    914-6 GT Clone in Progress
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