1997crank pulley fell off bolt snapped need to repair

SOURCE: H23 92 Prelude - Crank Pulley fell off

Make sure you check timing and the belt. if it spun don't risk putting it back on. Hope you got a new key. TIMING is important so you don't stick a valve through the top of your piston

SOURCE: 2001 opel corsa 1.4 is utility. Snapped the

Likely you are talking about the harmonic balancer.
The bolt turns counter clockwise and is generally removed using an air gun. There is another way to do that too but it is a bit dangerous. Using a solid breaker bar (one without jointed end) you can brace the end against the ground with the socket installed on the crank bolt (I actually have a pipe driven into the ground outside just for doing this...I just slide the bar into the pipe and keep it form dropping by using a vise grip on the handle). Once the socket is on the bolt, crank the engine over using the starter, the engine will force the bolt to back out.
After you get the belt installed, tighten it as much as you can by hand and ask a shop to just give it a final tightening with an air gun.
If the socket slips the bar can fly up so be very careful and don't stand where it can hit you!

SOURCE: broken idler pulley bolt 1999 honda cr-v

Drill the bolt out with the appoint size bit and use an ease out to extract it. Is the bolt broken flush with the outside of the engine or is it recessed??