I'm looking for suggestions, when basically everything has failed to remove a pedal. It's a pretty new bike (Trek 520). The drive side pedal came off fine, the non-drive side did not. I am aware that it has left-hand threads.
I initially used a 15mm pedal wrench, and tried with an allen key on the other side as well. Now, the flats on the bolt are completely stripped.
I used a metal file, to file new flats onto it. Then, I placed it on its side, and put a little WD40 into the bolt, so it could soak for about 30 minutes.
Then, I used a butane torch on the spindle, where it screws in.
After all this, I put an adjustable clamping wrench to it. The bike is upside down.
It stripped the teeth on the clamping wrench, without budging.
This is absurd. The only thing I haven't tried is a bolt extractor. After all of this, I don't have much faith in it.
It seems like I'm going to have to replace the entire crank. The one that comes with it is: Shimano Alivio T4060, 48/36/26, 2-piece w/chain guard, 175mm length
However, due to high demand, and limited resources from the pandemic, this has been sold out everywhere for some time. :/
Edit: Update. First of all, thank you, the responses here have been awesome, this is a terrific community.
I didn't have access to a vice, so I ended up taking the bike to my LBS. We removed the crank arm, stripped the pedal down to the spindle, and put it into a vice there. Flash forward to three of us working it, two pushing off the wall, and using a foot to torque the arm, while another alternates a blowtorch, and spraying it down with penetrating oil to the point of slightly deforming the arm. Whatever black magic is holding this thing, it will not let go.
The Alivio crankset isn't set to be back in warehouses until June, so we ordered a 175mm, left Sora arm for $30.