The older electrolytic condensers were manufactured with wax impregnated paper and aluminum foil. These also had an internal spring to insure wire contact between the foil sheets and the wires. Eventuallly parts corrode or the wax deteriorates and the insulation breaks down or wire/foil contact fails.
Computer manufacturers had a rash of electrolytic capacitor failures around 2005-210. This type uses a liquid composition to wet the insulator between the foil plates. The cheap versions from some pacific rim countries had used an incomplete electrolyte formula (no hydrogen scavenger). These crap caps failed prematurely causing mother boards from a number of major manufacturers to quit. The caps would burst, swell, vent, or barf out a brown ichor. They have been replaced with solid electrolyte polymer capacitors with 10 times the service life of even the older correctly manufactured electrolytic caps.
Perhaps something similar has happened with the current condensers manufactured for older Kettering systems. The problem is that the market for decent ignition condensers has declined so low that no one has a reliable replacement type other than a very few companies.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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