Engine 14b Restoring the Model T Magneto Field Coil

This is an additional video in the Model T Tips Engine series showing how to restore the magneto field coil.
Restoring the Magneto Field Coil
By Claude Jochman of Chelsea OK
with Mike Bender Tulsa OK
1. Reference Materials and Acknowledgements (1:10)
2. Cleanup Preparation and Removal of Coils (1:57)
3. Building a New Magneto Pickup (4:22)
4. Unwinding Straightening and Cleaning the Coil Windings (6:44)
5. Applying the ¼” Glass Insulating Tape to the Coil (11:23)
6. Winding the Coils (Left and Right Hand Coils) (13:41)
7. Wrapping the Coils with ½“ Glass Insulating Tape (19:20)
8. Begin Assembly of the Field Coil (25:52)
9. Install Coils (Right Left Right Left) (26:47)
10. Checking the Assembled Field Coil before Soldering (29:33)
11. Trimming and Connecting Coils Before Soldering (30:12)
12. Solder the Connections (33:45)
13. Solder the Ground and Magneto Post Connections (36:23)
14. Final Check (37:26)
15. Apply Insulating Varnish Coating (39:47)
16. Wrap-up discussion with Claude and Mike (42:00)
Web Site:
modelt-tips.com
or
modelt-tips.com/Engine/14b.html
Thank you for watching and all comments are appreciated.

[@ibsoarin]

Claude Jochmans passed away on December 16, 2023.
He was a gentleman and a man of honor. He will be forever known as an asset to the Model T community.

[@modelt-tips6985]

We agree. He is really missed.

[@Quignal]

Really helpful and very generous of Claude to share his knowledge.

[@modelt-tips6985]

Thank you for taking time to comment.

[@alexkalish8288]

I am a EE and have two observations to this superb presentation. The reason the coils must produce alternating current is the trembler coils require AC for the coil box transformers to make high voltage. They are just a short to DC. I would recommend not using the acid flux (as shown here) as after many years it will eat the copper and cause it to fail. Use only rosin core solder for this task or any electrical connection using copper. The process shown produces a beautiful field coil that's sound and reliable. Bravo -

[@rickolson9011]

Excellent presentation Claude! Great detail and tips to solve typical problems.

[@modelt-tips6985]

Rick, thanks for taking the time to comment.

[@geraldofalcao1762]

thanks to share your experience

[@modelt-tips6985]

Geraldo, thanks for taking the time to comment.

[@travisclarke9214]

I don't even own a model t, well probably never have the need to go through this process but this was cool to watch and learn.
Thanks for sharing your knowledge!

[@modelt-tips6985]

Thanks for taking time to comment.

[@mattsmith3286]

Great video! I love the detail and explanations.

[@modelt-tips6985]

Matt, thanks for taking the time to comment.

[@ibsoarin]

Claude,
I want to thank you for your time, experience and expertise on restoring Ford Model T Magneto Field Coils.
I have been looking for a supplier of 1/4" and 1/2" 3M-361 tape and will contact EIS-Oklahoma City. I plan on ordering extra 3M-361 tape to wrap sewing machine motor field coils (34 - 36 AWG magnet wire!). You probably did not realize that your video could apply to a small electric motor!
My father (91 years old) and I (about as young as you are) have been restoring Ford Model Ts since the early 1970s.
Best regards,
Mark.

[@modelt-tips6985]

Mark... thanks for taking time to comment! Stay Young!

[@ronfuller759]

You have done a grest job explaining. I like yiur work. Are you going to do any video on how to check a front axle for twist or bent? That will be my next project after my engine. I have not found anything showing just the Model T front axle inspection.

[@modelt-tips6985]

Good idea. Will put it on the list when we get around to a front end build.

[@skn9895]

It appears that EIS is no longer supplying the 1/4" tape. 😕
They do have the 1/2" tape, but you have to buy a minimum of 72 rolls! 😮

[@ashpowell9451]

Great instruction.
$35 a roll though (??), aside from knowledge and the exercise its surely more cost effective to simply pay one of the vendors that sell refurbs for $250.

[@modelt-tips6985]

Thanks for replying... I agree, unless you are set up to do a bunch it would not be worth the effort for one field coil. We decided to shoot this process so folks would see that it takes to get it done right.

[@erniecothran3112]

I recently checked the prices on the tape and materials as well and it was unrealistic. I have two coils that need to be rebuilt and have the wherewithal to do the job. It’s disappointing how inflation has changed everything and everyone is trying to make a buck and making it unaffordable to buy a rebuilt coil. The cost to buy after core charges, taxes and shipping runs nearly a thousand dollars.