Vintage IHC Spark plug/Points Gauge

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Vintage IHC Spark plug/Points Gauge

Postby SSSSSSSSSSS » Wed Dec 30, 2020 1:45 pm

I am new to the forum and I hope this is an appropriate place to ask this question.
I have stumbled upon an old, round, brass feeler gauge that is stamped with the old IHC logo. It has two feeler gauges pinned on it, one labled breaker points and the other labled spark plug.
Out of curiosity, I measured the gauges with a caliper and the breaker point gauge is 0.013" and the spark plug is 0.020".
Does anyone know what this could have went to, or how old it is? I found this in a box of junk so I have no possible idea where this could have came from.

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Re: Vintage IHC Spark plug/Points Gauge

Postby Jim Becker » Wed Dec 30, 2020 4:33 pm

Sounds like something from the 1930s, came with tractors then.

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Re: Vintage IHC Spark plug/Points Gauge

Postby Eugene » Wed Dec 30, 2020 4:34 pm

The .013" is the points gap for a magneto ignition. The .020" is the points gap for a battery powered ignition system.
I have an excuse. CRS.

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Re: Vintage IHC Spark plug/Points Gauge

Postby SSSSSSSSSSS » Wed Dec 30, 2020 4:51 pm

Thanks for enlightening me. I suppose if it came from the thirties it would have came with something along the lines of an F-12. I was a little dissappointed that it wouldn't work for a Cub.

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Re: Vintage IHC Spark plug/Points Gauge

Postby Jim Becker » Wed Dec 30, 2020 5:05 pm

Without looking in an F-12 parts book, I'd say yes. As Eugene said, the 0.013 end is right for the Cub magneto points and the 0.020 end is right for Cub battery ignition points.

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Re: Vintage IHC Spark plug/Points Gauge

Postby Eugene » Thu Dec 31, 2020 12:40 am

I also went and checked. The spark plug gap was .025 on most early IH/McCormick Deering tractors. Didn't find any IH tractors with a .020 spark plug gap.
I have an excuse. CRS.

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Re: Vintage IHC Spark plug/Points Gauge

Postby SSSSSSSSSSS » Thu Dec 31, 2020 9:23 am

Thats interesting. I only wish I had more history on this tool. Anyway, it is still an interesting keepsake that will certainly help me whenever I need to reset the points on my tractor.

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Re: Vintage IHC Spark plug/Points Gauge

Postby Jim Becker » Thu Dec 31, 2020 11:36 am

Does it have a part number?

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Re: Vintage IHC Spark plug/Points Gauge

Postby Eugene » Thu Dec 31, 2020 12:29 pm

https://www.jensales.com/content/ppp/in ... manual.pdf

Guessing again. The gauge is for the IH Hit and Miss engines. The manual, above, page 9, states to set the plug gap at .020".
I have an excuse. CRS.

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Re: Vintage IHC Spark plug/Points Gauge

Postby SSSSSSSSSSS » Thu Dec 31, 2020 12:49 pm

Jim, it does not have a part number, only the old logo with the large C wrapped around the IH symbol. It doesn't even have measurements on the gauges either.
I have seen pictures on the internet of them for sale but it doesn't tell anything about it that isn't already obvious.

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Re: Vintage IHC Spark plug/Points Gauge

Postby indy61 » Thu Dec 31, 2020 12:53 pm

It may have been a cheap tool for an IH truck.
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Re: Vintage IHC Spark plug/Points Gauge

Postby Jim Becker » Thu Dec 31, 2020 1:19 pm

Eugene wrote:. . . Guessing again. The gauge is for the IH Hit and Miss engines. The manual, above, page 9, states to set the plug gap at .020".

I think you are getting close. That page calls out 0.020 for the breaker points. A bit later, IH started using the IH H-1 mag on the single cylinder engines (I think at the change from LA to LB). I checked an LB manual (1941) and confirmed 0.020 spark plug gap and 0.013 ignition point gap. An illustration of setting the point gap shows a hand holding a gauge very similar to yours. A later edition of the LB manual (1947) has a different spark plug gap specified (0.028 to 0.032).

So it looks like your gauge COULD HAVE been supplied with the early LB engines until they changed the spark plug gap specification.

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Re: Vintage IHC Spark plug/Points Gauge

Postby Don McCombs » Thu Dec 31, 2020 1:32 pm

Whatever it’s for, it’s a unique piece of history.
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