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willysmjeeps.com :: View topic - Horn Adjustment Question...
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Horn Adjustment Question...

 
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OKCM38CDN
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Joined: Feb 17, 2012
Posts: 530
Location: Del City, OK

PostPosted: Sun Aug 01, 2021 12:44 pm    Post subject: Horn Adjustment Question... Reply with quote

I rebuilt my horn for my M-38A1 and inadvertently moved the adjustment. The horn sounded like a squeak more than a horn. I took it back apart and opened the gap some and have not tested it yet.

Has anyone measured the adjustment point on the horn to see what it was.

I have opened mine to 0.020".



Internals after rebuild / cleaning.
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Hal, KB1ZQ
TSGT, USAF (Ret)
1952 M-38 CDN CAR 52-31313
1952 M-100 Strick #104
1951 Willys Wagon (For Sale)
1954 Willys M38A1 201001205
Tornado Alley
Del City, OK
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RonD2
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Joined: Oct 02, 2014
Posts: 1889
Location: South Carolina, Dorchester County

PostPosted: Sun Aug 01, 2021 1:25 pm    Post subject: Reply with quote

Hi Hal,
Do you have a copy of TM9-1825B, Autolite Electrical Equipment?

The section on horns (page 366) calls out two 24vdc horns, the HX-4001UT and the HX-4002UT. The adjustment for both is .043

Good luck!
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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."
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RonD2
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Posts: 1889
Location: South Carolina, Dorchester County

PostPosted: Wed Aug 18, 2021 8:39 pm    Post subject: Reply with quote

Hi Hal,
Did you get it sounding manly?
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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: Thu Aug 19, 2021 5:59 am    Post subject: Reply with quote

Manly?

I think the civvy horns sound like the roadrunner in the cartoon!
Maybe where Plymouth got the idea!!

How do the 24 volters sound?
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Brian
1950 M38
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OKCM38CDN
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Joined: Feb 17, 2012
Posts: 530
Location: Del City, OK

PostPosted: Thu Aug 19, 2021 7:18 am    Post subject: Reply with quote

My horn is not a Autolite, and so the manuals do not apply. Sad

I have to adjust to just close or tighter for it to even sound, It moves but badly, the center shaft seems to have a bunch of corrosion in the portion that moves and so I have to take it apart and see if I can get some lubricant in there to make it move better.

The horn is a Sparks - Worthington dated 4-53 ord no 7728341

So I will keep working on it...
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Hal, KB1ZQ
TSGT, USAF (Ret)
1952 M-38 CDN CAR 52-31313
1952 M-100 Strick #104
1951 Willys Wagon (For Sale)
1954 Willys M38A1 201001205
Tornado Alley
Del City, OK
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wesk
Site Administrator
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Joined: Apr 04, 2005
Posts: 16225
Location: Wisconsin

PostPosted: Thu Aug 19, 2021 9:31 am    Post subject: Reply with quote

We discussed this about 12 years ago on G503 board. http://www.willysmjeeps.com/v2/modules.php?name=Forums&file=viewtopic&p=11414

Perhaps if it won't sound manly you may have a M211 backup warning buzzer!

Here is a little Sparks-Withington (Sparton) history: https://www.encyclopedia.com/books/politics-and-business-magazines/sparton-corporation

Here's a little more info on gap adjusting a Sparton Horn. https://forums.g503.com/viewtopic.php?f=4&t=301123&sid=dab40deac2afeed47936e3ea18a6319b

Here's a lot of Patent Info: https://patents.google.com/patent/US4361952A/en
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

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OKCM38CDN
Member


Joined: Feb 17, 2012
Posts: 530
Location: Del City, OK

PostPosted: Thu Aug 19, 2021 11:25 am    Post subject: Reply with quote

Thanks Wes, as far as I know the horn is correct for the M-38A1 The Ord No 7728341 is the correct horn per the SNL.

I can get it to semi work so I guess I will try cleaning the contacts. When I opened it up I could not get the plunger on the relay to work, lots of corrosion in there and have not figured out how to get it apart without doing damage to it...

Will keep working on it in stages, as do not want to damage it, is actually in good shape...
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Hal, KB1ZQ
TSGT, USAF (Ret)
1952 M-38 CDN CAR 52-31313
1952 M-100 Strick #104
1951 Willys Wagon (For Sale)
1954 Willys M38A1 201001205
Tornado Alley
Del City, OK
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wesk
Site Administrator
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Joined: Apr 04, 2005
Posts: 16225
Location: Wisconsin

PostPosted: Thu Aug 19, 2021 12:29 pm    Post subject: Reply with quote

Correct only because the Sparton PN was included in the ORD# and FSN in later years in the M38 ORD 9. The M38A1 ORD 9 Lists that ORD# 7728341 but under the manufacturer's column the only numbers listed are Autolite HX4001UT and WO# 800906. By 1952 when M38A1 production started the Factory had already switched to Autolite HX4004UT (the squared back horn). When you go forward to 1959's TM 9-2320-208-20P they add even more useable numbers IE FSN 2540-735-1412, & for later substitution FSN 2590-349-3650 which takes us back to late M38 WO# 8380883 (the later flat back horn).
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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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