Definition : Crank shaft seal is one of the most important seal in a motor vehicle. Crankshaft seal, keeps the place that should be used to prevent contamination of the engine oil and oil of contaminants such as dust, dirt outside. Felt the harsh conditions, the pressure is designed to be resistant to heat and oil. Felt cold weather pull-up, should the expansion in hot weather. It is therefore of great importance is the quality of the crankshaft seals.