Is there a special tool to lock crank remove pulley wheel nut?

Yes. There is a special tool to lock the crankshaft while removing the pulley wheel nut. It is called a crankshaft locking tool or a crankshaft hold tool. This tool is designed to fit into the crankshaft and prevent it from turning while you loosen or tighten the pulley wheel nut.

Crankshaft locking tools come in various designs, but they all serve the same purpose. Some tools are made to be inserted into the flywheel, while others are designed to fit into the crankshaft itself. The type of tool you need will depend on the specific engine you are working on.

Crankshaft locking tools are important safety tools that can help to prevent serious injury. By locking the crankshaft in place, you can ensure that it will not rotate unexpectedly while you are working on the pulley wheel nut.