So last week I cross threaded a park plug. Not too deep, but probably two full revolutions. As any sane person would, I freaked out. I looked at thread chases but they seemed like you could mess it up even more, and push metal shavings into the head.
So after some searching I found the
Powerbuilt 640811 14mm Back-Tap Thread Repair Tool
Basically you insert the tool into the head, expand the threads and back it out.
Even with the threads retracted you can lightly thread it in. Once reasonable deep I expanded it and then backed out. I probably did over a dozen passed. I was being extremely careful. I also kept the tool covered in grease to catch metal filings
The results were, I was able to easily thread my plug all the way down by hand before torquing it down
These don't appear to available in stores so I had to have Rover down all weekend while I waited for the tool.
So after some searching I found the
Powerbuilt 640811 14mm Back-Tap Thread Repair Tool
Basically you insert the tool into the head, expand the threads and back it out.
Even with the threads retracted you can lightly thread it in. Once reasonable deep I expanded it and then backed out. I probably did over a dozen passed. I was being extremely careful. I also kept the tool covered in grease to catch metal filings
The results were, I was able to easily thread my plug all the way down by hand before torquing it down
These don't appear to available in stores so I had to have Rover down all weekend while I waited for the tool.