You need Special Tools 6780-2 Sleeve (1), 6780-1 Installer (3) and 8179 Stud (2) to replace the front crankshaft seal (4). Once the seal is installed, follow the appropriate service guides for putting on the crankshaft vibration damper, along with the cylinder block assembly,
Harmonic Balancer, crankshaft pulley and vibration damper.