You don't immobilize the 112/113 engine in this manner, there is no tool made for holding the flywheel/ring gear on these engines, the crank can't take the stress.
The proper tool is a 3 pronged holder which engages into the "web" of the front pulley.
Heating the bolt may help soften the thread locker. I assume you are replacing the harmonic balancer anyways, it's the only reason I've seen one taken off. But it's a big bolt, and I also doubt the small torch will have much affect (won't heat it up enough to do much good).
Sometimes removing the radiator and condensor will help so you can use impact tools.
Otherwise, you need the right tools and a long pipe over the breaker bar, and a big guy to help pull.

Gilly