Table 4: JTEKT oil seal type codes and corresponding ISO and JIS standardsSpark plugs play a crucial role in the combustion process of an internal combustion engine. These small but powerful components are responsible for igniting the air-fuel mixture in the engine's cylinders, ultimately powering the vehicle.
- Over time, due to constant exposure to heat, pressure, and chemical exposure, these gaskets can wear out or become damaged. Signs of a failing spark plug valve cover gasket include oil stains on the engine, a burning oil smell, or even misfiring spark plugs Signs of a failing spark plug valve cover gasket include oil stains on the engine, a burning oil smell, or even misfiring spark plugs
Signs of a failing spark plug valve cover gasket include oil stains on the engine, a burning oil smell, or even misfiring spark plugs Signs of a failing spark plug valve cover gasket include oil stains on the engine, a burning oil smell, or even misfiring spark plugs
spark plug valve cover gasket. If left unchecked, it could lead to more severe issues like engine damage, necessitating costly repairs.
Next, apply a small amount of grease to the seal lip(s) and the area of the shaft in contact with the seal. When using a double-lip seal, fill the small cavity between the two lips with grease as well. This both protects the lips during initial installation and break-in, and also acts as another barrier keeping contaminants out. When installing rubber-coated seals, apply lubricant to the outside diameter as well. This will help prevent the seal from rebounding or backing out from its mounting place.
- The design of spark plugs has evolved significantly over time, with advancements in materials and technology leading to improved performance and durability. Modern spark plugs are made from high-quality materials such as platinum, iridium, or nickel alloys, which offer superior resistance to heat and erosion, resulting in longer service life.
These oil seals are the best for applications involving high temperatures. It’s suitable for temperatures between -4 degrees Fahrenheit and 392 degrees Fahrenheit. Also, it’s highly resistant to acids, dissolvent materials, and other chemicals. Viton (FKM/FPM) oil seals can run at a maximum speed of 38 m/s.


Cracks or swelling
Heat resistance
Most standard oil seals have to comply with the DIN 3760 and ISO 6194 standards. Different standard types of oil seals are available that comply with these requirements.
PTFE Oil Seals - A relatively new and exciting oil seal, the use of polytetrafluoroethylene means that they can withstand dry or unlubricated operations. With a massive thermal range of -130ºC to +200ºC and a strong resistance to chemicals, they are considered to be the future of rotary shaft seals.
Repeat with the ruler laid diagonally between the other two comers.
Figure 3: Sealing function of main lip radial load
* KOYO is a registered trademark of JTEKT.
Figure 4 shows the features of a JTEKT oil seal.

valve oil seal. Excessive oil in the combustion chamber can lead to fouled spark plugs, increased emissions, and reduced engine performance. By controlling the flow of oil into the combustion chamber, valve oil seals help to maintain optimal engine function.
What are Oil Seals – A guide to Oil and Rotary Shaft Seals
Bonded piston seal
Heat and attrition are generated by the parts moving against each other. The sealing function can only be ensured if an intentional defined leakage of oil is able to exit for seal lubrication, preventing seal wear and possible failure, while a tight static seal between shaft and sealing lip must be assured when the shaft is stationary.
They are best known for their bright light emission that is far reaching. Their tungsten is encased in a quartz tube filled with xenon gas. They may require more power when turned on but use much less of it to maintain brightness. Moreover, they have a longer lifespan compared to the halogens. They may seem better but they also present some limitations such as being more expensive as far as manufacturing and replacement is concerned. They are not easy to manufacture from their complex design. Their bright light cause a blinding effect to oncoming traffic which is undesirable and can cause dangers on roads.