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willysmjeeps.com :: View topic - Horn Diaphragm
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Horn Diaphragm

 
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RonD2
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Joined: Oct 02, 2014
Posts: 1889
Location: South Carolina, Dorchester County

PostPosted: Mon Dec 07, 2020 5:24 pm    Post subject: Horn Diaphragm Reply with quote

I know this is a long shot but thought I'd ask if anybody has a bad horn in their scrap or salvage pile (without much corrosion) that they'd part out the diaphragm for a fair price? Mine is shot (full of holes).....

This is out of an Autolite Electric HX-4004-UT 24vdc horn. From what I can tell, M-series Autolite and Sparton diaphragms are all the same. Haven't had any luck finding NOS or repop diaphragms. If I could find out who has the current military supply contract to make 24vdc horns I'd call them. Believe it or not, except for this, the rest of my horn is in good shape.

Thanks!
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Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

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Eades
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Joined: Jul 10, 2018
Posts: 97
Location: Western Washington

PostPosted: Tue Dec 08, 2020 11:16 am    Post subject: Reply with quote

There is a guy on eBay right now with $25 Spartan horns. Good luck.
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Rick Eades
1951 M38 & 1967 M715
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RonD2
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Joined: Oct 02, 2014
Posts: 1889
Location: South Carolina, Dorchester County

PostPosted: Tue Dec 08, 2020 11:24 am    Post subject: Reply with quote

Thanks Rick! That's my fall back plan.
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Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

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RonD2
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Joined: Oct 02, 2014
Posts: 1889
Location: South Carolina, Dorchester County

PostPosted: Mon Dec 21, 2020 6:47 pm    Post subject: Reply with quote

Taking a chance that they're all the same, I got lucky and was able to locate a replacement diaphragm from a similar (but not the same model) take-off horn. The donor horn had no tag so I can't tell the maker, but it has the "dog dish" style back and different internals than my "dome" style Autolite. But the diaphragms are near enough identical to be the same. Got to clean this one up a bit more and paint it, but it's solid.


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Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

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45auto
Moderator
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Joined: Apr 06, 2005
Posts: 147
Location: Georgia

PostPosted: Mon Dec 21, 2020 8:42 pm    Post subject: Reply with quote

Outstanding!!
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Harold W.
MVPA #6833
1945 GPW
1950 CJV-35/U
1951 M38 1952 M38
1962 USMC Contract M38A1
1953 Strick M100 1967 Johnson M416
1968 CJ5 4-Speed 1969 CJ5 V6
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RonD2
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Joined: Oct 02, 2014
Posts: 1889
Location: South Carolina, Dorchester County

PostPosted: Tue Dec 22, 2020 10:03 am    Post subject: Reply with quote

Thanks Harold !
I've still got to finish cleaning up and re-wiring the HX-4004-UT horn, then reassemble it and properly adjust the switch contact points for that sweet sound.

Hopefully I'll still have a good working horn when I'm done. I'll take and post a few more photos of that in another thread shortly.
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Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

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4x4M38
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Joined: May 30, 2014
Posts: 3440
Location: Texas Hill Country

PostPosted: Wed Dec 23, 2020 7:20 am    Post subject: Reply with quote

Ron,
Just a thought. You may not want to paint the diaphragm. It’s internal anyway, but doing so may dampen the sound.

Just my two cents.

Brian
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Brian
1950 M38
MC11481
http://www.willysmjeeps.com/v2/modules.php?set_albumName=album372&op=modload&name=gallery&file=index&include=view_album.php
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RonD2
Member


Joined: Oct 02, 2014
Posts: 1889
Location: South Carolina, Dorchester County

PostPosted: Wed Dec 23, 2020 12:09 pm    Post subject: Reply with quote

Hey Brian,
Yes, considering that. On inspection of the original and donor diaphragms, only the top outboard side is painted (I'm guessing) because it can be seen under the outer grill and shield, or just got painted incidental over-spray, can't tell which. The undersides are bare metal. I'm kind of concerned about corrosion long-term (even though it'll likely never get wet), so I might either give the underside a light coat of primer or clear anyway. If I can't adjust the horn for sweet sound I can always strip it off. Thanks!
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Ron D.
1951 M38 Unknown Serial Number
1951 M100 Dunbar Kapple 01169903 dod 5-51

“The only good sports car that America ever made was the Jeep."
--- Enzo Ferrari

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