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Thread: Help: rounded off spark plug

  1. #1

    Help: rounded off spark plug

    Like the title says, rounder off plug number 1 in my Miata as I was prepping to take it out today. Any ideas on how to get it out? I was thinking taking a slightly undersized socket and gently pounding it on. Terrible idea? Any help is greatly appreciated.

  2. #2
    I have some sockets built like female EZ-outs. Work great. The sell them at Menards, get the base set and the upgrade pack. All the sockets fit in the case that comes with the base set. If you want to borrow mine, I'll PM you my phone number. I'm in Saint Paul. I should wander out to the shop and see if they are large enough for the 13/16" size.

    You already know that you will have to break off the porcelain, eh? Get in there with a shop vac and whatever tubes you can scrounge to get the broken pieces out.
    Phil Ethier West Side Saint Paul Minnesota USA
    1973 Triumph Stag LE22439UBW "uncle jack", Sapphire Blue
    2004 Suburban 8.1, Sport Red, the only automatic of the bunch
    2005 Lotus Elise, Bordeaux Red Pearl
    2005 Subaru Legacy GT Limited, Regal Blue Pearl
    pethier [at] comcast [dot] net
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  3. #3
    Hey Phil, that would be awesome. PM me your number when you can. That was the second question was how to get the cracked porcelain out. I just grabbed a can of air to blast it out, but maybe a strong vac is still in order?

  4. #4
    Quote Originally Posted by Adam777 View Post
    Hey Phil, that would be awesome. PM me your number when you can. That was the second question was how to get the cracked porcelain out. I just grabbed a can of air to blast it out, but maybe a strong vac is still in order?
    PM already sent.

    Hmm. May have some bad news. The largest socket in this set is nominal 3/4", which may or may not fit a rounded 13/16". First confirm for me, does the Miata use the 13/16" size plugs?

    If this is a nonstarter, call some car-parts places and see if they have a dedicated EZ-out-like socket for spark plugs. It is hard to believe that the toolmakers haven't foreseen this happening.

    I would think a soda straw on a shop vac would be a could idea. Porcelain is really hard, and I wouldn't want any in the cylinder.
    Phil Ethier West Side Saint Paul Minnesota USA
    1973 Triumph Stag LE22439UBW "uncle jack", Sapphire Blue
    2004 Suburban 8.1, Sport Red, the only automatic of the bunch
    2005 Lotus Elise, Bordeaux Red Pearl
    2005 Subaru Legacy GT Limited, Regal Blue Pearl
    pethier [at] comcast [dot] net
    http://www.flickr.com/photos/pethier
    http://www.mnautox.com
    http://www.mntriumphs.org
    http://www.flickr.com/groups/triumphtransamerica

  5. #5
    It is a 5/8" according to Miata.net. That is what I have used before as well with no issue until today.

  6. #6
    Typically broken pachood's Avatar
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    for some reason Im having a brain **** right now, but can you take the valve cover off?
    If so, that might make it a little easier to work with, although you would want to plastic off the head.
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  7. #7
    Yeah, I probably could take the valve cover off, but it would not give me ton more room to work, maybe 1.5". I'd like to not since I don't feel like replacing my 1year old gasket, but if I have to I will.

    I got all the cracked porcelain out so that is good. Just need to get that damn plug out.

    Done working on it for now to take a cocktail break at Psycho Suzi's. If anyone has any ideas or tools to help, I'd be super grateful and owe you pizza or beer or something.
    Last edited by Adam777; 04-02-2011 at 05:41 PM.

  8. #8
    Fun with cars JCN's Avatar
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    Can you use a little WD-40 to help lube the threads?

  9. #9
    The threads are not really the problem. I always use anti-seize so they are ok.

    I took one more look and it looks like there is part of the plug the is not rounded off way at the bottom. If I can find a 5/8" socket with thin walls, I may be able to get it. My socket may have been too thick walled and on the verge of doing this to all of them.
    Last edited by Adam777; 04-03-2011 at 12:54 AM.

  10. #10
    If you have the undersize 5/8" spark plugs, the socket set I have should work.
    Phil Ethier West Side Saint Paul Minnesota USA
    1973 Triumph Stag LE22439UBW "uncle jack", Sapphire Blue
    2004 Suburban 8.1, Sport Red, the only automatic of the bunch
    2005 Lotus Elise, Bordeaux Red Pearl
    2005 Subaru Legacy GT Limited, Regal Blue Pearl
    pethier [at] comcast [dot] net
    http://www.flickr.com/photos/pethier
    http://www.mnautox.com
    http://www.mntriumphs.org
    http://www.flickr.com/groups/triumphtransamerica

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