- In the vast and intricate machinery of modern industry, there exists a tiny yet indispensable component that often goes unnoticed—the small rubber gasket. This unassuming item, while seemingly mundane, plays a pivotal role in ensuring the smooth operation and longevity of various systems and equipment.
Why do I have to install my Oil Seal this way?
Significance of Quality Seals in Automotive Applications:
- Trailer Hub Oil Seal: Trailer hub oil seals are designed to maintain the integrity of the wheel hub assembly on trailers and towed vehicles, preventing the leakage of lubricating oil and the ingress of contaminants. These seals are essential for ensuring the proper functioning and longevity of the wheel bearings and other internal components in trailer applications.
- Rubber oil seals with a rubber fabric outer case
Start the engine and check for oil leaks.
- 3. Face seals These seals are designed to seal between two flat surfaces. They are commonly used in pumps, compressors, and other applications where a tight seal is required.
- 2. HVAC Systems In heating, ventilation, and air conditioning (HVAC) systems, thick rubber gaskets provide insulation and prevent air leakage, improving energy efficiency and comfort.
- Spark plug wires play a crucial role in the ignition of an engine, as they are responsible for transferring the electrical current from the distributor or ignition coil to the spark plugs. This current is what creates the spark that ignites the air-fuel mixture in the combustion chamber, ultimately powering the vehicle.
Successful assembly first requires careful preparation. By following a few simple steps, you significantly increase the chances of a flawless assembly.
For more detailed information, please see the following:
, such as placing the seal in the wrong position in its housing or handling it incorrectly.


Oil seals are widely used as sealing devices for machines.
JTEKT's oil seals are described in our catalog, Oil Seals & O-Rings.
However, the catalog uses a large number of technical terms and is very long, so many people seem to have trouble handling it.
Therefore, this series of columns will summarize the following in order:
• The structure, functions, and types of oil seals
• How to select the right oil seal
• Handling of seals, and causes and countermeasures for oil seal failure

3. Seal types and numbering system
You may need to turn the crankshaft so that it protrudes less. Turn the front pulley bolt with a spanner or socket.
MH: O.D. wall is a rubber material
HM: O.D. wall is a metal case
MH(S)H: O.D. wall is metal with a reinforced inner metal case
Rotary Wheel Of Auto Parts
The primary function of an oil seal is to create a barrier between the rotating or moving parts of a machine and prevent oil or other fluids from leaking out. This helps to ensure that the machinery operates smoothly and efficiently without any loss of lubrication or contamination of the surrounding environment. In addition to preventing leakage, oil seals also help to retain lubricant within the system, extending the life of the equipment.
Double metal cased