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    #1

    Help needed

    The thread for number 1 cylinder head has stripped

    I need help to fix it urgently as I am booked to attend the National Day next week.

    I believe it can be repaired without taking the cylinder head off but I have no experience of doing this.

    Is there anyone out there that can assist? I live near Bournemouth and am a member of the Solent goup.

    Colin
    07771977933
    Last edited by Zebracer; 2 July 2025, 13:56.
    Tags: None
    #2
    Do you mean the spark plug thread?

    Comment

      #3
      As Steve asks, spark plug thread? If yes and you think it’s savalgeable you can buy a spark plug thread chaser which works from the inside out. https://www.amazon.co.uk/Sealey-MS00...A3P5ROKL5A1OLE

      If it’s not salvageable then you need a time-sert which I think is like a super helicoil - not sure what’s involved in using one of those.
      Paul - 3 projects, 1 breaker - garage built and housing 2 white Stags. One runs, one doesn't

      Comment

        #4
        We had good results with the Sealey tool mentioned by Goldstar when repairing crossed threads at the top of no. 7 spark plug thread.

        Comment

          #5
          Originally posted by Philip Wardle View Post
          We had good results with the Sealey tool mentioned by Goldstar when repairing crossed threads at the top of no. 7 spark plug thread.
          Me too Phil. I even know where it is in my garage
          Paul - 3 projects, 1 breaker - garage built and housing 2 white Stags. One runs, one doesn't

          Comment

            #6
            Had a similar problem with No6, so much so that it popped out whilst driving.
            I got home on 7 cylinders.

            Repaired using a thread insert - can't remember the name but it was the tube shape rather than a Heli-coil type.
            Rotating the engine so that No6 was at its highest.
            I carefully cut the new thread making sure the tap remained correctly aligned by keeping it pointed at a mark on the inner wing - pre-determined.
            Cleaned the tap regularly to minimise swarf getting into the cylinder.
            Then blew out the debris.
            Then brake cleaner into the hole and blow it again.
            Once happy I installed the thread insert, with a coating of a specific thread locker - again can't remember the version - sorry.

            Been installed for 2 years without further problems.
            Good luck.
            Last edited by Rigid; 2 July 2025, 21:47.
            Richard
            Burbling for Britain on the Leics / Lincs border

            Comment

              #7
              Agree that a standard HeliCoil insert isn't ideal for spark plug repair, though I see that they do have the option of tangless inserts - these might need a special tool to install though? A possible option is E Z Lok as in this link https://www.ezlok.com/ezlok-insert-329-1412 but I haven't double checked that this example is the right size. I've not used E Z Lok inserts for spark plugs myself but did use one to repair to the thread in the inlet manifold for the carbs mounting stud. These inserts are more expensive but you dn't need to buy special tools, standard drills and taps will suffice. Can find these online with a search.



              Screenshot 2025-07-03 at 05.08.32.png
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                #8
                https://amzn.eu/d/3FUsUGD

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