ST-224C Rear Crankshaft Seal & Wear Sleeve Installer Tool for Cummins 3.9L 5.9L 6.7L 8.3L 9.0L Paccar PX-6 PX-8. Paccar Engines: PX-6, PX-8 (1989 & newer). For Cummins 3.9 5.9 6.7L Rear Crankshaft Seal Wear Sleeve Installer Alt ST-224C.