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An oil seal normally consists of three basic components: the sealing element, the metal case and the spring. The purpose of the sealing element is to stop the fluid from leaking between the shaft and housing. The metal case will give rigidity and strength to the seal while it is being held in the bore or recessed groove. The garter spring ensures constant pressure and maintains the radial force to the shaft, flattening the sealing edge to a defined width. The garter spring maintains the radial force exerted by the sealing lip around the shaft surface. All materials must be selected depending on the environment in which the oil seal will function.
The sealing effect is achieved by manufacturing a smaller inside diameter than the required shaft size, which preloads the sealing lip. A garter spring is often used to ensure a constant force on the shaft.
How does an Oil Seal Work
Steering Oil Seal and Its Impact on Vehicle Steering Mechanism


When choosing silicone and rubber gaskets, it is important to consider the specific requirements of the application, including temperature range, chemical exposure, and sealing pressure. High-quality gaskets should be selected based on their material composition, durability, and compatibility with the intended use. Working with reputable suppliers and manufacturers ensures access to reliable silicone and rubber gaskets that meet industry standards and performance requirements.
Rotary Wheel Of Auto Parts
Oil seals have a flexible lip that actually rubs against the rotating shaft or housing to prevent leakage. The spring keeps the lip in contact with the shaft. Bearing isolator oil seals are dynamic seals that incorporate a rotor or rotating member and a stator or stationary member. The rotor actually turns with the shaft. Some oil shafts are bearing isolators with a labyrinth construction. Others incorporate simpler O-rings.

The sealing lip is always made of a rubber or synthetic material. For oil seals with a rubber outer case (R, RST, GR, GRST), the rubber quality of the sealing lip and the outer case are the same.
Rotary Wheel Of Auto Parts

Clean all dirt and oil from the housing, and set the new seal in place with its open (spring) side towards the engine.