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Thread: Spark plug thread size?

  1. #1
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    Spark plug thread size?

    Can anyone confirm for me what the correct thread size is on the spark plug?

    Thanks!

  2. #2
    Senior Member DMC-81's Avatar
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    According to this link the OEM plug thread size is 17mm.
    https://m.autozone.com/external-engi...15300_199221_0
    Dana

    1981 DeLorean DMC-12 (5 Speed, Gas Flap, Black Interior, Windshield Antenna, Dark Gray)
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  3. #3
    Senior Member DMC-81's Avatar
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    Quote Originally Posted by DMC-81 View Post
    According to this link the OEM plug thread size is 17mm.
    https://m.autozone.com/external-engi...15300_199221_0
    Sorry, here is a better link with more info on the Specs tab. According to this, the thread size is 14mm and the thread pitch is 1.25 .

    https://www.sparkplugs.com/product.aspx?zpid=8261

    Perhaps someone can confirm this by actual measurements. I don't have one nearby.
    Dana

    1981 DeLorean DMC-12 (5 Speed, Gas Flap, Black Interior, Windshield Antenna, Dark Gray)
    Restored as "mostly correct, but with flaws corrected". Pictures and comments of my restoration are in the albums section on my profile.
    1985 Chevrolet Corvette, Z51, 4+3 manual
    2006 Dodge Magnum R/T (D/D)
    2010 Camaro SS (Transformers Edition)

  4. #4
    Senior Member cis6409's Avatar
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  5. #5
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    Thank you! I ordered a tap for it and now will just have to get the courage to do it. Thanks again.

  6. #6
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    spark plug?

    Did you cross thread the spark plug?
    Is it going to hold?

  7. #7
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    If the threads are damaged typically you do not try to "repair" them with a tap. The preferred method is to get a Heli-Coil kit or one like it. It comes with a drill, a tap, an insert, and a tool to install the insert. You drill the threads out, retap and install the insert. Makes it better than new. Most auto stores will have a kit or can get you one quickly. To prevent this from happening most mechanics use a drop of Never Seize when they install new plugs.
    David Teitelbaum

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