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Spark plugs play a crucial role in the combustion process of an internal combustion engine. These small but powerful components are responsible for igniting the air-fuel mixture in the engine's cylinders, ultimately powering the vehicle.

When the total eccentricity is excessive, the sealing edge of the seal lip cannot accommodate shaft motions and leakage may occur.
Total eccentricity is the sum of shaft runout and the housing-bore eccentricity.
Total eccentricity, shaft runout and housing-bore eccentricity are generally expressed in TIR (Total Indicator Reading).