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Early engines used O-rings (also called packing rings or toric joints) as seals (first patented in 1896). These are just mechanical gaskets in the shape of a torus (a circular ring--like a lifesaver), seated in a groove and compressed during assembly between two or more parts. It creates a seal at the interface. However, O-rings require a fluid film to lubricate them. They have limited usefulness in vacuum application and at extremes of temperature. The modern oil seal represents a significant improvement over the simple O-ring because it effectively seals in lubrication and prevents contamination from outside under a wide range of pressures and temperatures.
Replacing the fuel-pump gasket
Regular inspection and maintenance of spark plugs are essential to identify signs of wear, fouling, or deterioration. Proper replacement of worn or fouled spark plugs, including the transition to iridium spark plugs where applicable, is crucial for maintaining the efficiency and reliability of the vehicle's ignition system. Adhering to recommended service intervals and using high-quality replacement components are essential for optimizing the performance and longevity of the vehicle's engine.
3. Shaft and housing design

For installation tools, make sure that they do not have any jagged edges that may damage the seal during the installation process.
Friction damper