5. Seals and Gaskets Necessary to ensure that the system remains closed and leaks are prevented.
Oil Seal Installation
- The BR7EF spark plug, manufactured by leading automotive component producers, is designed with precision and durability in mind. The 'BR' in its name denotes its 'Resistor' type, indicating that it has a built-in resistor that reduces radio frequency interference, ensuring smooth operation and preventing electrical system malfunctions. The '7' signifies its heat range, which is ideally suited for a wide variety of engines, providing optimal heat dissipation for efficient combustion. Lastly, the 'EF' denotes its electrode configuration, featuring a fine wire center electrode, promoting better ignition and improved fuel economy.
One of the key benefits of the 25x47x7 oil seal is its high level of resistance to wear and tear. This makes it an ideal choice for use in heavy-duty machinery and equipment that is subject to constant movement and pressure. The seal is able to withstand the rigors of daily use without degrading or failing, ensuring long-lasting performance and reliability.
-35 °C to + 100 °C
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).



The basic principle of an oil seal is fairly straightforward. It is installed adjacent to the bearing, with the flexible lip against the rotating shaft and the casing pressed into the housing to hold the seal in place. It’s important that the sealing lip is lubricated to prevent it from overheating as a result of any generated friction. It’s also crucial to understand which type of seal is appropriate for your particular machinery. Before selecting your seal, consider the environment, temperature, pressure and shaft speed of your machine, as well as the type of medium the seal will come into contact with during operation. These considerations will all determine the size, colour, and type of lip material or sealing element to choose, and whether it can be sealed in or sealed out.

rubber edge 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
The maximum allowable shaft speed is a function of the shaft finish, runout, housing bore and shaft concentricity, type of fluid being sealed and the type of oil seal material.