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HEMICUDA
mopar addict


Reged: Nov 22 2004
Loc: Medina, Ohio
Prestolite horn repair 101
      #5698212 - Wed Dec 30 2009 11:42 AM Attachment (265 downloads)

Here's my step-by step "how to", not all the tough really.

1. Split the horn in half.
From the power side, take a drill bit that is larger then the swedge and drill until it is no longer holding the two halfs together. Drill all 6 and pull it apart. Make note of the orientation of the metal diaphragm and the back halve to the trumpet. While you have the drill out, take a number #29 drill bit and drill out the trumpet side and tap it for a #8-32 machine screw.

2. Look at the inside of the magnet and you’ll see two small contacts, that’s where all the problem is. Take a piece of sand paper folded in half, open the two contacts with a screw driver then slide the paper between them and take the screw driver out. Pull the sand paper, this will clean both contacts as you do that.

3. If the cardboard gasket that is on the trumpet is bad, cut a new on from any paper stock the thickness of, lets say, the cover of your Mopar Muscle magazine.

4. Your ready to test.
Reassemble the horn, I use 3 vise grips and make sure they’re tight.

5. Screw the horn assembly together and use a cutoff wheel to trim the threads flush then use the side of the wheel to grind off to a flat the other end of the screw.

I've done a half dozen horns so far and they all work.


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HEMICUDA
mopar addict


Reged: Nov 22 2004
Loc: Medina, Ohio
Re: Prestolite horn repair 101 [Re: HEMICUDA]
      #5698214 - Wed Dec 30 2009 11:43 AM Attachment (262 downloads)

#2

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HEMICUDA
mopar addict


Reged: Nov 22 2004
Loc: Medina, Ohio
Re: Prestolite horn repair 101 [Re: HEMICUDA]
      #5698219 - Wed Dec 30 2009 11:43 AM Attachment (238 downloads)

3#

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HEMICUDA
mopar addict


Reged: Nov 22 2004
Loc: Medina, Ohio
Re: Prestolite horn repair 101 [Re: HEMICUDA]
      #5698221 - Wed Dec 30 2009 11:44 AM Attachment (246 downloads)

#4

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resq302
super gas


Reged: Jan 23 2003
Loc: Northern Passaic County, NJ
Re: Prestolite horn repair 101 [Re: HEMICUDA]
      #5698452 - Wed Dec 30 2009 01:50 PM

Mike,

Will this work for Spartan horns also?

--------------------
Brian
Northern NJ
69 Charger 383 HP 4-spd console (AACA Senior Gold National Winner)
69 GTX convert, #s match, orig. sheet metal, T3 Honey Bronze, quasi-survivor
70 Challenger Convert. #s match, built 9/69 (AACA Senior Gold Natn'l Winner)


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jeff968
super gas


Reged: Jan 20 2003
Loc: Connecticut
Re: Prestolite horn repair 101 [Re: HEMICUDA]
      #5698461 - Wed Dec 30 2009 01:59 PM

Great post, i have a nice set of correct ebody horns in my challenger that don't work. Do you ever need to replace anything inside?
Jeff

--------------------
1970 Dodge Challenger T/A



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HEMICUDA
mopar addict


Reged: Nov 22 2004
Loc: Medina, Ohio
Re: Prestolite horn repair 101 [Re: resq302]
      #5698501 - Wed Dec 30 2009 02:30 PM

Quote:

Mike,

Will this work for Spartan horns also?





Haven't had a Spartan horn apart yet, I'm sure they are as simple as the Prestolite.


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HEMICUDA
mopar addict


Reged: Nov 22 2004
Loc: Medina, Ohio
Re: Prestolite horn repair 101 [Re: jeff968]
      #5698507 - Wed Dec 30 2009 02:32 PM

Quote:

Great post, i have a nice set of correct ebody horns in my challenger that don't work. Do you ever need to replace anything inside?
Jeff




The only thing I had to make was the gasket. There is one thing I forgot, do not sand/glass bead the diapham because it's spring steel and the heat will ruin it. I used sand paper to clean most of the rust off.

Edited by HEMICUDA (Wed Dec 30 2009 02:40 PM)


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