The real problem is when you get resistance putting a spark plug in, and just grab a wrench and force it in all the way. Someone who does that, deserves the cost of repairs. Great video as always. Cheers from Winnipeg.
Never seen one of these tools. Volkswagen beatles used to give me spark plug thread problems. I always used a thread chaser in all cylinder holes needed or not before installing new plug just to be safe. This actually straightens the damaged metal. Very cool. Just learned something useful here - not just for rotax either. Cheers. 👍
I remember those cars, I also wish I knew about this tool back then! Mmm I wonder if it had invented yet? I’ll need to check the package for a patent date.
The only caveat I would provide is that to do the repair you are actually removing material. Depending on how badly the cylinder head has been cross threaded, isn’t it possible that the repair could result in the plug not being able to be torqued properly? I had a repair done on my 503 by a technician for the same reason and even though I could torque the plug it came out in flight. I ended up replacing the cylinder head.
It actually removes very very little material, it’s more of a realignment of the threads. Torques up perfectly. No issues at all. I do know that if any type of thread replacement sleeve is installed it absolutely will fail and the spark plug will fly out.
