Ford 2003 Mustang Workshop Manual page 974

5. Using the special tool, remove the crankshaft pulley (6B321).
Installation
1. Apply a bead of silicone gasket and sealant to the keyway in the crankshaft damper and use the
special tool to install the crankshaft pulley.
2. Install the crankshaft bolt.
3. Lower the vehicle.