I took out the spark plug on the fourth cylinder and it appeared to have some metal on its thread I cleaned it out and put it back inside while tightening it the thread broke inside

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The part in circle is what broke off, although the tip which is not connected to the threads is still there.

Now how do I deal with this problem? Do I have to take off the head and remove the bits and remove the plug?

  • Can you add a photo of the damaged plug?
    – dlu
    Oct 12, 2016 at 23:38

1 Answer 1


Alright I managed to remove it using a screw driver and hammering on it, I know this could have broken the threads inside but luckily it didn't. I used penetrating fluid to help loosen it a bit more. The engine was sputtering after installing the new spark plug because I add a little bit excess of penetrating fluid but after it cleared up it ran fine.

  • 2
    Right on, glad you got it out. +1 for success Oct 13, 2016 at 3:21

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