Spark Plug Threads Mashed - Misfire

[Wagonwheel555]

The initial message was deleted from this topic on 05 August 2020 at 10:00

[Collectingbrass]

With the proviso that I make Clarkson look like he has some finesse, I would get the car recovered to a local garage. What it could cost you if you make the problem worse will far outweigh £50 to a local recovery firm to move it for you - you may find if you have a breakdown membership that they may move it for you FOC.

[motco]

I had a similar problem with a damaged plug thread. Mine was in a cast iron head but if the head were aluminium alloy then I wouldn't do what I did. A tap of the relevant thread size covered in sticky grease run gently up and down the plug hole cleaned up the head, and a new spark plug screwed in smoothly and sealed nicely. The grease prevents any swarf from falling in to the bore. In an alloy head I'd leave it to a specialist such as Thread Doctor. A Helicoil fixed my son's car with a stripped thread in alloy.

[anonymous-user]

motco said:

I had a similar problem with a damaged plug thread. Mine was in a cast iron head but if the head were aluminium alloy then I wouldn't do what I did. A tap of the relevant thread size covered in sticky grease run gently up and down the plug hole cleaned up the head, and a new spark plug screwed in smoothly and sealed nicely. The grease prevents any swarf from falling in to the bore. In an alloy head I'd leave it to a specialist such as Thread Doctor. A Helicoil fixed my son's car with a stripped thread in alloy.

This, though I’d want something a little more solid than a Helicoil if an insert’s needed. Maybe a Keensert or similar.