25 coils

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Topic author
BenLocke
Posts: 2
Joined: Wed May 21, 2025 5:01 pm
First Name: Ben
Last Name: Locke
* REQUIRED* Type and Year of Model Ts owned: 25 coupe
Location: ponder

25 coils

Post by BenLocke » Thu May 22, 2025 10:16 am

Rebuilding my coil box, but found two coils are leaking tar. Does this mean they are overheating and probably bad?


Moxie26
Posts: 1863
Joined: Sun Jan 06, 2019 8:20 pm
First Name: Robert
Last Name: Jablonski
* REQUIRED* Type and Year of Model Ts owned: 1926 Runabout
Location: New Jersey
MTFCA Life Member: YES
Board Member Since: 1999

Re: 25 coils

Post by Moxie26 » Thu May 22, 2025 10:24 am

As a new Forum member, wouldn't hurt to have them all checked. Common faults..... capacitor leaks, coil points wear, lose calibration ,and get stuck with debris.

User avatar

WillyR
Posts: 273
Joined: Wed Aug 21, 2024 5:24 pm
First Name: Vilhelm
Last Name: VonRaschke
* REQUIRED* Type and Year of Model Ts owned: 1924 coupe
Location: ABQ

Re: 25 coils

Post by WillyR » Thu May 22, 2025 10:58 am

I got excited thinking you had 25 coils laying around....

as long as the test and calibrate fine I wouldn't worry about them.
Sent from the panic room, via two tin cans attached with a string, and a jail broken Marconi, while wearing a Tin Foil hat.


Moxie26
Posts: 1863
Joined: Sun Jan 06, 2019 8:20 pm
First Name: Robert
Last Name: Jablonski
* REQUIRED* Type and Year of Model Ts owned: 1926 Runabout
Location: New Jersey
MTFCA Life Member: YES
Board Member Since: 1999

Re: 25 coils

Post by Moxie26 » Thu May 22, 2025 11:14 am

Chances are that your coils are not the original ones provided when the car was built. Different owners during the years had their hands into it. Changing and replacing things leaking. Melted outside the box tar usually indicates an overheated coil could be due to a bad timer, shorted timer wire, bad internal wiring.


Jerry VanOoteghem
Posts: 4082
Joined: Sun Jan 06, 2019 4:06 pm
First Name: Jerry
Last Name: Van
Location: S.E. Michigan

Re: 25 coils

Post by Jerry VanOoteghem » Thu May 22, 2025 1:38 pm

Does it appear as if the tar leaked out recently? The coil is most likely 100 years old. The tar may have leaked out 75 years ago. How bad is it? If it works fine, I would continue to use it.


Topic author
BenLocke
Posts: 2
Joined: Wed May 21, 2025 5:01 pm
First Name: Ben
Last Name: Locke
* REQUIRED* Type and Year of Model Ts owned: 25 coupe
Location: ponder

Re: 25 coils

Post by BenLocke » Thu May 22, 2025 2:47 pm

Re-wiring the car also. The harness, coil box, and coils appear to be unmolested to me.
Worn brittle and bare wires everywhere.
Intermittent no start, but when it decides to start runs smoothly.

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