Re: stripped spark plug thread

[Mumbles]

quote OLCAH:

The head did not tap well. The tap tore the aluminum head material without cutting clean threads. The head is quite thin so the tapped thread was short. The insert just pulled out.

Something went wrong here, big time. The supplied tap in the kit has a pilot thread on it and will follow what’s left of the original threads, if any, before the wider section cuts the required thread for the insert. The pilot ensures the threads are going to cut at the same angle to the head as the original ones were. This should have been a plug and play type of operation and the threads shouldn’t have failed.