92 Carvan Crankshaft Torsional Damper Removal

I'm having difficulty removing my Torsional Damper from the crankshavt
on my '92 Dodge Carvan 3.0 V6 engine.  My Haynes manual isn't clear,
do I have to remove the crankshaft's center bolt?  With a wrap wrench
and socket wrench I've haven't been able to budge the bolt.  I don't
want to apply more torque in fear of doing it wrong and causing
damage.  Am I missing something?

Thanks,

Mark