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E3 Diamond Spark Plugs

Discussion in 'Early CJ5 and CJ6 Tech' started by jeepstar, Jul 14, 2022.

  1. Jul 14, 2022
    jeepstar

    jeepstar Well-Known Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Sheboygan
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    As part of my yearly tune up I installed 4 new spark plugs. Went fancy, I know. But any little thing I can do to help this old gal run smoother, I'm fine with that.
    Working from front to the firewall, the first 3 looked fine. The last one, closest to the firewall was covered in oil!! Is this bad, or REALLY REALLY BAD¿
    Resized_Resized_20220714_170517.jpeg
     

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  2. Jul 14, 2022
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Valve cover gasket leaking? It's not fouled so it can't be internal and couldn't get on the threads anyway.
     
  3. Jul 14, 2022
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member 2021 Sponsor 2020 Sponsor

    Bozeman, MT
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    that is kind of weird....looks like the oil is seeping down the threads from outside (like a valve cover leak Glenn mentioned), as opposed to excess oil in the combustion chamber. The electrodes look dry and not fouled or carbon coated.
     
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  4. Jul 14, 2022
    kenb

    kenb Cleverly disguised as a responsible adult

    Detroit
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    I agree with the above, Looks to me like run down oil from a leaky rocker arm cover gasket. Or from the oil line to the head? I can't remember what side of the block that's on. Can you post a photo of the porcelain part of the plug?
     
  5. Jul 14, 2022
    jeepstar

    jeepstar Well-Known Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Sheboygan
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    It's in the trash.
     
  6. Jul 15, 2022
    58 willys

    58 willys Sponsor

    Millsboro, Delaware
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    As said above plug not fouled would highly speculate the valve cover
     
  7. Jul 15, 2022
    Oldpappy

    Oldpappy A.C. Fults - Curmudgeon at large 2022 Sponsor 2021 Sponsor

    East Tennessee
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    A leak from the rocker cover is the only thing that makes sense. Looks like it is time for an oil change too.
     
    Glenn likes this.
  8. Jul 15, 2022
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    Let's hope a rod doesn't start knocking if he changes it. :)
     
  9. Jul 15, 2022
    jeeper50

    jeeper50 jeeps 'till I die

    Gawja
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    Main oil line is on the opposite side, swap the valve cover gasket and begin a watch to see if it returns
     
  10. Jul 16, 2022
    kenb

    kenb Cleverly disguised as a responsible adult

    Detroit
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    IMG-20220716-WA0001.jpg
    This is the oil line I was saying you might want to check for a leak
     
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  11. Jul 18, 2022
    jeepstar

    jeepstar Well-Known Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Sheboygan
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    Brakes went out:shock:, so its going to the shop to get looked at by a real mechanic. Brake failure don't bother me, it's my wife I'm more concerned about.
    I refilled the empty MC and had her pump the brakes as I was looking for leaks, but I didn't see anything apparent
     
  12. Sep 28, 2022
    jeepstar

    jeepstar Well-Known Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Sheboygan
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    Review: I went back to the lawnmower sparkplugs today. It's been running fine, just not quite right. Installed 4 new AC Delco units, and took it for a drive. Ran smoother.
    Here are the 3 sparkplugs I removed. The last one i didnt include due to me not fixing that leaking oil return line.

    Resized_20220928_161128.jpeg
     
  13. Sep 28, 2022
    jeepstar

    jeepstar Well-Known Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Sheboygan
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    The E3 may be good for newer cars, but I really feel like it's a waste of money for my fhead
     
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  14. Sep 28, 2022
    colojeepguy

    colojeepguy Colorado Springs

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    I tried a set in my 460 Ford and was underwhelmed.
     
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  15. Sep 28, 2022
    danielbuck

    danielbuck Uncle Buck

    USA
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    Same here, the cheaper plugs seem to be just fine for our engines, I tried E3 plugs and didn't really notice any difference at all. Back to regular ones :)
     
  16. Sep 29, 2022
    Rick Whitson

    Rick Whitson Detroit Area 2022 Sponsor 2021 Sponsor 2020 Sponsor

    I live South of...
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    Lawnmower plugs form Ace Hardwear work just as Good. Champion J 8 is what I have always used. Just saying.
     
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  17. Sep 29, 2022
    Jeepenstein

    Jeepenstein Me like Jeep..

    North Central FL
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    Personally I like Bosch super copper. Not that I have ever seen any improvement in anything, just my plug of choice..
     
  18. Sep 30, 2022
    Vanguard

    Vanguard Take Off! Staff Member

    Vista, CA USA
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  19. Oct 3, 2022
    Jeepenstein

    Jeepenstein Me like Jeep..

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    They have always served me well also..
     
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