Installation Of Thread Insert
Hold the installation tool straight above and centered over the hole. Screw in the insert without applying pressure on the spindle handle. Screw in until the end of the insert reaches at least half a thread revolution into the thread.
The insert must not touch the bottom of the hole or stick out of the other side if it is a through hole.
Break off the tang with the proper tang breaker. For M14 threads and coarser, use a pair of flat-nosed pliers or similar and break downwards.
There are times when the cap nut cannot be used because of space restrictions. On these occasions the guide should be taped into place.
As the thread insert for the spark plug thread is thinner (finer) than usual it is extra important to not pressure on the pin when inserting the thread insert (both in the nozzle and the material).
Twist the thread insert down and check that the upper thread is at least a half thread down into the thread and that none of the insert protrudes into the combustion chamber.
If the insert has been screwed in too far it must be turned until it is all the way through. If it is not deformed it can be inserted again.
Break off the tang with a pair of flat nose pliers. Check the thread. Install a spark plug.