Seal for the gearbox rotating shaft Presentation A shaft seal makes a rotating shaft leaktight where it passes through a wall. The crankshaft seal ensures a perfect tightness of the engine crankcase at both ends. This seal has an elastomer sealing lip in friction contact with the primary or secondary shaft of a gearbox, and keeps a fluid within the environment to be sealed. The static tightness is achieved using a rubber outside coating on the armature. Advantages - Resistance to high temperatures and pressure - Chemical resistance to oils