Shaft seal set for the crankshaft at Gilera Runner, Stalker.
Shaft seals are natural wear parts of every engine. If they are defective, they can no longer perform their very important task of sealing a shaft or axle against an undesirable medium such as air, oil and/or water. This can result in very unpleasant side effects, such as false air, which can quickly kill an engine, especially in the case of crankshafts.
Sometimes defective rotary shaft seals can also cause gradual defects that remain undetected for the time being. A slightly increased idle speed does not arouse the curiosity of inexperienced drivers, but at the latest after the jamming after a long full throttle drive the question arises: why? In order to avoid this extremely philosophical question, it is worthwhile changing shaft seals at regular intervals. Regular in this case refers to a time or kilometre interval. So from a mileage of 20000km on, an engine revision should be considered.
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