Is Engine Crankshaft Oil Seal Leakage a Major Issue?

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Not a major issue, but it does have some impact. Valve oil seal leakage can accelerate oil consumption and cause blue smoke from the exhaust pipe, but it has little effect on engine power. The valve oil seal prevents oil from entering the intake and exhaust pipes, thereby avoiding oil loss. It also prevents the leakage of the air-fuel mixture and exhaust gases, and stops engine oil from entering the combustion chamber. Below is extended information about oil seals: Function: An oil seal is a mechanical component used to contain lubricants, commonly found in the bearing areas of various machinery. Its primary function is to isolate lubricated parts from the external environment, preventing lubricant leakage. It serves the dual purpose of sealing oil internally and keeping out dust externally. Materials: Modern oil seals are primarily made from various types of rubber, such as nitrile rubber, acrylic rubber, polyurethane rubber, silicone rubber, fluororubber, and polytetrafluoroethylene rubber. The typical structure of an oil seal is as shown in the figure below, offering advantages like simple design, lightweight, compact installation space, and ease of manufacturing.