Broken Magneto Horn Bolt

Discuss all things Model T related.
Forum rules
If you need help logging in, or have question about how something works, use the Support forum located here Support Forum
Complete set of Forum Rules Forum Rules
Post Reply Previous topicNext topic
User avatar

Topic author
PaladinBirdy
Posts: 23
Joined: Tue Aug 17, 2021 10:11 am
First Name: Josh
Last Name: Hollingsworth
* REQUIRED* Type and Year of Model Ts owned: 1919 Touring Pickup
Location: Nashville, TN
Board Member Since: 2021

Broken Magneto Horn Bolt

Post by PaladinBirdy » Wed Jan 12, 2022 12:01 pm

Tried to adjust my magneto horn, barely put any pressure on the stuck nut and the brass bolt snapped right in half. The lower half of the bolt is still in there. How difficult is this gonna be to fix? Is there an easy way to replace the bolt or should I get to soldering?
A 'youngin.
Top
User avatar

DanTreace
Posts: 3813
Joined: Sun Jan 06, 2019 10:56 am
First Name: Dan
Last Name: Treace
* REQUIRED* Type and Year of Model Ts owned: ‘12 open express,'23 cutoff, '27 touring
Location: North Central FL
Board Member Since: 2000
Contact:
Contact DanTreace

Re: Broken Magneto Horn Bolt

Post by DanTreace » Wed Jan 12, 2022 12:18 pm

Haven't repaired a magneto horn before, but others have.

Took this photo off the web, and it shows the mag horn with its pieces apart.

That brass bolt perhaps is part of the piece that drives the diaphragm. Maybe the photo helps.



Mag horn apart.jpg
Mag horn apart.jpg (46.09 KiB) Viewed 2254 times
The best way is always the simplest. The attics of the world are cluttered up with complicated failures. Henry Ford
Don’t find fault, find a remedy; anybody can complain. Henry Ford
Top
User avatar

Rich Eagle
Posts: 6895
Joined: Fri Jan 04, 2019 10:51 am
First Name: Richard
Last Name: Eagle
* REQUIRED* Type and Year of Model Ts owned: 1909 TR 1914 TR 1915 Rd 1920 Spdstr 1922 Coupe 1925 Tudor
Location: Idaho Falls, ID

Re: Broken Magneto Horn Bolt

Post by Rich Eagle » Wed Jan 12, 2022 1:23 pm

This is what the my mag horn nut looks like. It crimps into the diaphragm. I don't have the screw and 1/4-28 won't go all the way through. It might be extra fine.
MaghrnNut.jpg
When did I do that?
Top

jab35
Posts: 1001
Joined: Sun Jan 06, 2019 12:28 pm
First Name: James
Last Name: Bartsch
* REQUIRED* Type and Year of Model Ts owned: '26 Coupe
Location: Dryden, NY 13053
MTFCA Life Member: YES

Re: Broken Magneto Horn Bolt

Post by jab35 » Wed Jan 12, 2022 1:46 pm

Maybe it's 14-24 bolt. Try a bendix cover screw or old brass magnet clamp screw if you happen to have one lying round.
Top
User avatar

Rich Eagle
Posts: 6895
Joined: Fri Jan 04, 2019 10:51 am
First Name: Richard
Last Name: Eagle
* REQUIRED* Type and Year of Model Ts owned: 1909 TR 1914 TR 1915 Rd 1920 Spdstr 1922 Coupe 1925 Tudor
Location: Idaho Falls, ID

Re: Broken Magneto Horn Bolt

Post by Rich Eagle » Wed Jan 12, 2022 3:50 pm

I found the screw. 1/4-32. I was in error when I measured the thread. The OD was .240 and I mistook it for #12 and got the thread count wrong. I'm confident it is 1/4-32. I will inform Martynn Vowell.
maghrn.jpg
When did I do that?
Top
User avatar

Topic author
PaladinBirdy
Posts: 23
Joined: Tue Aug 17, 2021 10:11 am
First Name: Josh
Last Name: Hollingsworth
* REQUIRED* Type and Year of Model Ts owned: 1919 Touring Pickup
Location: Nashville, TN
Board Member Since: 2021

Re: Broken Magneto Horn Bolt

Post by PaladinBirdy » Thu Mar 03, 2022 10:26 am

Yikes. Where am I gonna find a 1/4-32 bolt/screw?
A 'youngin.
Top

jab35
Posts: 1001
Joined: Sun Jan 06, 2019 12:28 pm
First Name: James
Last Name: Bartsch
* REQUIRED* Type and Year of Model Ts owned: '26 Coupe
Location: Dryden, NY 13053
MTFCA Life Member: YES

Re: Broken Magneto Horn Bolt

Post by jab35 » Thu Mar 03, 2022 11:40 am

John Regan may know, he's still serving the model community as JRC Products, LLC. piewagon(at)gmail(dot)com jb

The Vowell Art mag horn diagram shows 1/4-32 x 1 1/4 " long center bolt. app.php/gallery/image/2257
Top
User avatar

Rich Eagle
Posts: 6895
Joined: Fri Jan 04, 2019 10:51 am
First Name: Richard
Last Name: Eagle
* REQUIRED* Type and Year of Model Ts owned: 1909 TR 1914 TR 1915 Rd 1920 Spdstr 1922 Coupe 1925 Tudor
Location: Idaho Falls, ID

Re: Broken Magneto Horn Bolt

Post by Rich Eagle » Thu Mar 03, 2022 12:05 pm

McMaster-Carr
https://www.mcmaster.com/screws/thread-size~1-4-32/
They may have a minumum order.
Rich
When did I do that?
Top

JimmyT831
Posts: 1
Joined: Thu Nov 18, 2021 10:34 pm
First Name: James
Last Name: Long
Location: Capitola, CA

Re: Broken Magneto Horn Bolt

Post by JimmyT831 » Sat Mar 12, 2022 6:57 pm

PaladinBirdy,
Finally checked my messages.
Sent you a reply. I still have what you need.
Jim
Top
Post Reply Previous topicNext topic

Return to “General Discussion Forum”