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Author Topic: Spark Plugs...Millimeter???  (Read 2749 times)

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Offline athawk11

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Spark Plugs...Millimeter???
« on: January 05, 2014, 11:18:45 PM »
I have replaced the plugs in a few Willys Jeeps, but have never really paid attention to the thread size.� They have always fit, so, no worries.

I need to pick up an engine compression tester and want to get one with the proper connection.� I am led to believe the plug size in our Willys have MM threads.� Is that correct? :o

Tim
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Offline scoutpilot

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Re: Spark Plugs...Millimeter???
« Reply #1 on: January 06, 2014, 03:55:53 AM »
Not metric that I am aware of. Go to NAPA and ask for the 'good' compression tester. It will have adapters, but worked for me on both the L and F heads straight out of the box.
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Offline garage gnome

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Re: Spark Plugs...Millimeter???
« Reply #2 on: January 06, 2014, 08:32:26 AM »
I think 18mm is the metric equivalent.
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Offline 1955CJ-5

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Re: Spark Plugs...Millimeter???
« Reply #3 on: January 06, 2014, 01:05:11 PM »
The spark plugs are 14mm...

I bought an Innova Equus #3612 tester and it comes with adapters for 12, 14 and 18 mm.

I don't remember where I got it, but it told me what I wanted to know!

And so why are they metric...? The early manufacturer of the spark plug, Albert Champion, was French.....

The Innova tester has instructions in three languages, including French, so it must be good!
« Last Edit: January 06, 2014, 01:14:17 PM by 1955CJ-5 »
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Offline SteveW

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Re: Spark Plugs...Millimeter???
« Reply #4 on: January 07, 2014, 01:18:34 AM »
14mm for sure. I made the mistake of trying to Americanize one of mine and had to fix it with insert kit.
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Offline gmcjr

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Re: Spark Plugs...Millimeter???
« Reply #5 on: January 13, 2014, 05:12:24 AM »
Quote
The spark plugs are 14mm...

And so why are they metric...? The early manufacturer of the spark plug, Albert Champion, was French.....


Thanks! Was always curious!
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Gary in N. Texas
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