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07-13-2015, 06:57 AM | #1 |
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Join Date: Jul 2014
Location: NW Pa./Sc.
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Sparton horn questions
I figured I would ask the experts before I get into this project. I'm getting power to the horn. When I push the horn button on the steering wheel, I can hear the motor turning inside the horn. On a rare occasion the horn will attempt to "aooga" but it's pretty faint. I've tried the adjustment screw, but that doesn't seem to help. What should I be looking for when I remove the back cover of the horn? Mike's "A" Fordable parts sells a rebuild kit. Thanks
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07-13-2015, 07:59 AM | #2 |
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Join Date: May 2010
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Re: Sparton horn questions
Try moving the armature back and forth -there shouldn't be any looseness/play . If there is, you can bend the tensioner tang on the outer motor base plate to take up the looseness - but don't over bend it either which can cause problems. Also check the ratchet wheel on the armature end for looseness.
Jon in Ohio |
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07-13-2015, 11:14 AM | #3 |
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Location: Norcross, GA
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Re: Sparton horn questions
Confirm the diaphragm is not installed backwards... as was the case on a horn I bought here a while back. Flipped it over and it works just fine.
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07-13-2015, 04:10 PM | #4 |
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Location: Portland, Oregon
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Re: Sparton horn questions
Remove the motor cover and observe the motor when you push the button. If the motor spins freely but no Ahooga you have an adjustment problem or your diaphragm need attention. If it doesn't spin freely or spins slowly it might be brushes or a dirty commutator. If it doesn't spin at all there is a short or a bad ground or a broken connection somewhere.
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07-13-2015, 04:11 PM | #5 |
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Location: Rocklin, CA
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Re: Sparton horn questions
I have also seen the diaphragm in backwards. I have a video on the rebuild of a horn on You Tube. youtube.com/modelatimes and look for the horn video.
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07-13-2015, 05:53 PM | #6 |
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Re: Sparton horn questions
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That may be one option after you check out what is going on with your's. Maybe you have a cheapo repop from the 70's they were pretty bad-------------------- |
07-13-2015, 11:49 PM | #7 |
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Re: Sparton horn questions
On the bottom on the horn motor there is a wavy disc (ratchet). The wavy disc rubs against a nub on the diaphragm. As the ratchet spins it causes the diaphragm to vibrate and make the sound. As the motor speeds up you get the AHHHH, at speed OOOOO and as it slows the GAHHH.
Your motor is spinning that's 80% right there. Now, as mentioned, you need to see if the ratchet is rubbing on the diaphragm.
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07-14-2015, 06:19 AM | #8 |
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Join Date: Jul 2014
Location: NW Pa./Sc.
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Re: Sparton horn questions
Thanks to all! It's supposed to rain today so I think I'll tear into it today. I'm sure there will be more questions coming on my part. I will report back. Thanks again, Smitty
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07-14-2015, 08:49 AM | #9 |
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Location: Rocklin, CA
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Re: Sparton horn questions
A&L make the repro horns everyone sells. They will sell the motor unit separate if you want to keep your original horn. But the repro complete unit is really nice and you really can't tell it is not original.
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07-14-2015, 09:00 AM | #10 |
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Re: Sparton horn questions
I'll second that John. Ours looks great on the car looks like a fully restored original. And works perfectly.
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07-14-2015, 11:50 AM | #11 |
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Join Date: Jul 2014
Location: NW Pa./Sc.
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Re: Sparton horn questions
GOT HER FIXED!! I took the horn off the car and cleaned and adjusted a few things. The diaphram was not on backwards. Got it all back together & realized I forgot to reinstall one of the gaskets. The hardest part of the whole deal was lining up the rear cover. It sounds great! Thanks to all for all of your help.
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