[jonobro]

Originally Posted by Stück

Repairing threads on a cylinder head while installed on the engine is very very very difficult to do on a modern BMW direct injection head as the spark plug bore is very narrow AND not straight in. Any cutting and installing tools are not going to be able to tackle the repair from the installation side. It must come in from the chamber.

The only way a reliable repair is going to occur is with the cylinder head off of the engine. You are going to have a professional correct it, and it is going to be a lot more than what it would have been to let them carry out the spark plug service correctly to begin with.

You can't be saying that