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#566967 - 12/30/09 11:42 AM Prestolite horn repair 101
HEMICUDA Offline
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Registered: 11/22/04
Posts: 1651
Loc: Medina, Ohio
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.


Attachments
5698212-HORN.gif (383 downloads)


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#566968 - 12/30/09 11:43 AM Re: Prestolite horn repair 101 [Re: HEMICUDA]
HEMICUDA Offline
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Registered: 11/22/04
Posts: 1651
Loc: Medina, Ohio
#2


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5698214-HORN1.gif (382 downloads)


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#566969 - 12/30/09 11:43 AM Re: Prestolite horn repair 101 [Re: HEMICUDA]
HEMICUDA Offline
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Registered: 11/22/04
Posts: 1651
Loc: Medina, Ohio
3#


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5698219-HORN2.gif (338 downloads)


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#566970 - 12/30/09 11:44 AM Re: Prestolite horn repair 101 [Re: HEMICUDA]
HEMICUDA Offline
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Registered: 11/22/04
Posts: 1651
Loc: Medina, Ohio
#4


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5698221-HORN3.gif (336 downloads)


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#566971 - 12/30/09 01:50 PM Re: Prestolite horn repair 101 [Re: HEMICUDA]
Anonymous
Unregistered


Mike,

Will this work for Spartan horns also?

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#566972 - 12/30/09 01:59 PM Re: Prestolite horn repair 101 [Re: HEMICUDA]
jeff968 Offline


Registered: 01/20/03
Posts: 3098
Loc: Connecticut
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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#566973 - 12/30/09 02:30 PM Re: Prestolite horn repair 101 [Re: ]
HEMICUDA Offline
top fuel

Registered: 11/22/04
Posts: 1651
Loc: Medina, Ohio
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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#566974 - 12/30/09 02:32 PM Re: Prestolite horn repair 101 [Re: jeff968]
HEMICUDA Offline
top fuel

Registered: 11/22/04
Posts: 1651
Loc: Medina, Ohio
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 (12/30/09 02:40 PM)

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