- The main bearing oil seal is a crucial component in the engine's lubrication system. It plays a vital role in preventing oil leakage from the engine's main bearings while allowing the rotation of the crankshaft. This dual functionality ensures the smooth operation of the engine and extends its service life.
To ensure correct fit and proper protection against contaminants, the inside diameter of an oil seal must be slightly smaller than the shaft diameter.
How to Choose the Right Oil Seal
- Conclusion
Polyacrylate oil seals are a perfect compromise between quality and cost. They perform well with high temperatures and chemicals, but not as well as Viton oil seals. Polyacrylate has a temperature range of -25 degrees Fahrenheit to 300 degrees Fahrenheit. Due to their outstanding resistance to hot oil and oxidation, they are commonly used in automobile transmissions and hoses; however, they are also used for shaft seals, gaskets, and o-rings.
Rotary Wheel Of Auto Parts

Because synthetic motor oil can cost two to four times more than regular oil, talk to your technician about whether it’s the right oil for your car. If you live in a climate with super cold winters or very hot summers, or use your vehicle for towing or hauling, synthetic oil may be the best type of oil for your vehicle. Older engines could also benefit from synthetic oil, as it can help prevent harmful sludge build-up that some older engines seem to be prone to.
For a more detailed discussion of seal characteristics, please see the following:
Seal characteristics
Despite being a great substitute for more expensive high temperature resistant materials, polyacrylate has a problem of poor water compatibility and cold flexibility.

front hub oil seal. Most mechanics recommend replacing the front hub oil seal every 60,000 to 80,000 miles, but this can vary depending on your driving habits and the conditions in which you drive.
Today, traditional oil seals have to compete with a new variant oil seal, which is used in most modern engines.
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The allowable total eccentricity is the maximum total eccentricity at which the sealing edge can accommodate shaft rotation and retain adequate sealing performance. The oil seal's allowable total eccentricity is affected by the design of the oil seal, the accuracy of the shaft, and the operating conditions.
Oil seals normally consist of three basic components: the sealing element, the metal case, and garter spring.

