crack in yellow top coil - Ford Mustang Forum
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post #1 of 3 (permalink) Old 2 Weeks Ago Thread Starter
64must's Avatar
Joined: May 2014
Location: Layton
Posts: 26
crack in yellow top coil

I have a yellow top coil I got from the salvage yard today. When I cleaned it up, I saw a crack in the yellow part of the coil about 1" long. Can it be repaired? It's a FoMoco coil & I would like to use it in my 1964 !/2 mustang.
Thank you, Brent

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post #2 of 3 (permalink) Old 2 Weeks Ago
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Charles Reeves's Avatar
Joined: Sep 2010
Location: Knoxville
Posts: 1,422
Unless you live in an area where new ones are hard to get and/or expensive, I'd just get a new one. They are only $30-$40 in the U.S. Given that you don't know the history of it, I wouldn't take a chance on it in my car.

That said, I think the coil innards are filled with resin, so it's possible things may be OK even if water has gotten inside. And the crack could probably be easily filled.

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post #3 of 3 (permalink) Old 2 Weeks Ago
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Joined: Dec 2008
Location: Albuquerque
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The factory yellow-top coils were filled with oil to help cool the windings and a cracked top might cause them to leak. The repro yellow-tops are epoxy filled and can't leak.

If it works OK, doesn't leak and you don't mind seeing the crack then you should be OK. Otherwise, you might want a new coil which are $30. I bought one and tore it apart to see what was inside. I never actually used it on a car but it looked and measured as expected. I use the factory orignals that came from Ford but was scoping out a replacement in case I ever need one.
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