Hello Everyone,

I have a cross threaded spark plug hole on the passenger side of a 1996 Disco I and found these back taps from KD Tools they have 10, 12, 14 and 18mm sizes. But not sure what size I need to order. Any help would be great!

Thanks

 

The easiest would be tomeasure the spark plug.

Most times its time to pull the head and have a insert put in.

 

As I was posting I saw http://timesert.com/

 

If you go to your auto parts store they have a dye that can tap/clean out a bad set of threads in a spark plug hole which works real well.