I did the same thing when I changed mine several years ago. I ended up grinding the head off the bolt with a cutoff wheel. Funny part was that once I did that I was able to back the bolt out with my fingers (gloved of course). I presume because of the heat and lack of tension on it after I removed the pulley.
Thanks for posting this!
It seems the battery life of the DeWalt 20V drill, isn't long lasting compared to the impact wrenches. I'll consider drilling the head off entirely, then pulling the tensioner off, and hoping vise grips will be strong enough to turn it.
2001 Integra GS Automatic Coupe; B18B1: 240,000 miles.
Last edited by k3ntegra; 04-01-2019 at 08:13 PM.