How to Remove a Stuck Crank Pulley Bolt Without a Puller

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1. Loop the old accessory belt around the crank pulley.

2. Run both sides of the belt over an available accessory pulley.

3. Anchor the other end of the loop on a third pulley.

4. Rotate the crank pulley and take up the belt slack by letting the crank pulley end pinch the belt under itself.

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When the last of the slack is gone, the belt should immobilize the crank pulley completely, allowing you to apply gobs of bolt-loosening torque.

Or a decent strap wrench does the trick as well, similar action.  

Decent being the key word, i dont think most of the ones with plastic handles can take it. Seems like ones with metal handles are available at $15-30: strap wrenches

I do use chain wrenches for this but with a lot of pulleys you have to wrap a rag around the pulley to protect it from the chain. The only big advantage of the chain wrench is that it's unlikely you would buy one that turns out to be a flimsy POS.