For more detailed information, please see the following:
In conclusion, installing oil seals correctly is an important step in maintaining the performance and efficiency of rotating machinery. By following these steps, you can ensure that your oil seals are installed correctly and will provide a leak-free performance. If you have any questions or concerns about installing oil seals, consult with a professional or refer to the manufacturer's instructions. Proper installation of oil seals can help to extend the life of your machinery, reduce the risk of leaks, and ensure a safe and efficient operation.
Conventional oil seals
Today, traditional oil seals have to compete with a new variant oil seal, which is used in most modern engines.
What are Oil Seals - Guide to what an Oil Seal is used for


The block is unlikely to distort except after severe overheating, but check anyway using a steel ruler or similar high-quality straight-edge.
Replacing the fuel-pump gasket
Please see the following for the types of sealing devices for bearings.
How to Select the Right Bearing (Part 7): Components surrounding the bearing
Oil seals are always exposed to a lot of chemicals, both mild and harsh chemicals. The seals react by showing some signs like cracks, blisters, and discoloration especially when the chemical is harsh. This clearly shows that the chemical is not compatible with the seal, which goes as far as affecting its cross-link density (increase or decrease). When the cross-link density increases, the seal material becomes harder, but when it decreases, the seal material becomes softer.
(5) The surface finish of the shaft directly affects the service life of the oil seal, that is, the higher the shaft finish, the longer the service life of the oil seal.
Seals perform much better and longer when they are continuously lubricated with an oil that has the correct viscosity for the application and that is compatible with the seal lip elastomer material. The consideration of seal incompatibility, particularly with certain additives and some synthetic lubricants, should not be ignored, but unfortunately very often is.