To remove a stubborn crankshaft bolt:
1. Use a breaker bar or impact wrench for increased leverage and power.
2. Apply penetrating oil or heat to loosen any rust or debris.
3. Secure the crankshaft using a flywheel holding tool.
4. Turn the bolt counterclockwise with force, applying steady pressure.
5. If necessary, use a bolt removal tool for added grip and torque.