shattered crank shaft pulley

[CoryM]

Your pistons etc will be fine. Depending on how it broke you may need to replace the oil seal as well, but probably not. Typically what happens is the rubber part tears, allowing the pulley to come apart. The middle part of the pulley is probably still correctly attached to the crank, so the crank should be fine. You're probably fine to just replace the pulley, belt etc. I wouldn't bother running it with the pulley off as it will make a mess and it's unlikely to have engine damage.
Cheers.