How to remove the valve cover 2016-2017 Le2 engine - Page 2
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Thread: How to remove the valve cover 2016-2017 Le2 engine

  1. #11
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    I don't think I've ever seen 10mm spark plugs in a car before.

    And I've never seen 14mm plugs with 14mm hex.
    I'm used to 5/8 or 13/16 hex for 14mm plugs, 18mm for 12mm plugs.

    I guess now I know not to be shocked when I see how small the plugs are in a few years.
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  3. #12
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    Quote Originally Posted by Taxman View Post
    I don't think I've ever seen 10mm spark plugs in a car before.

    And I've never seen 14mm plugs with 14mm hex.
    I'm used to 5/8 or 13/16 hex for 14mm plugs, 18mm for 12mm plugs.

    I guess now I know not to be shocked when I see how small the plugs are in a few years.
    You still haven't seen 10mm thread plugs. The LE2 uses 12mm thread plugs with a 14mm hex.
    GM standard for years has been 14mm thread with 16mm(5/8”) hex.

    GM doesn't use a plug with an 18mm hex(at least not in remotely recent history or memory.) 18mm hex is mostly a power sports/motorcycle size, with probably some random old Nissans and Volvo's thrown in for good measure.

  4. #13
    Fuhnominon is offline [OP]
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    Thanks guys

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  6. #14
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    My motorcycle was 5/8 I beleive. It wasn't the bigger size.

  7. #15
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    Quote Originally Posted by snowwy66 View Post
    My motorcycle was 5/8 I beleive. It wasn't the bigger size.
    Highly likely...5/8 is very common. But 18mm plugs are widely used by Honda, on current bikes and all the way back the to the 60s/70s, used by the Cagiva group, Ducati, BMW and most Euro bikes that used related engines, Ferrari has used 18mm in many of it's highest production engine from 80s/90s, Lamborghini, BMW....Etc.

  8. #16
    Fuhnominon is offline [OP]
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    Hi guys, thanks so much for all the help. I bought a 14mm deep socket and it worked perfectly. It wasn't even a spark plug socket and still it was able to do the job easily. I really, really appreciate the help. 🙂 this forum as been invaluable

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