- The MK7 GTI's spark plugs also contribute to the vehicle's emissions control
- Oil seals are typically made from materials like nitrile rubber (NBR), which offers excellent resistance to oils and fuels, or polyurethane, which provides superior wear resistance. The choice of material greatly influences the seal's performance and lifespan. The 40x52x7 oil seal, being a standard size, is widely used in automotive engines, gearboxes, pumps, and various industrial machinery where reliable oil containment is paramount.
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.
To install them, both correctly and professionally, it is essential to use the right special tool for the replacement part. We recommend replacing this component with the aid of OE repair manuals with complete and extensive instructions.
Type ‘C’ oil seal has an additional cup inserted into the outer cup of ‘B’ type. The supplementary metal inner ring provides a superior stiffness. This type is recommended for use in heavy polluted environments. As the static sealing between housing and metallic shell is limited, low viscosity media can “creep”.
Oil seals, also known as rotary shaft seals, are a type of gasket used to prevent lubricant leakage and contamination in rotating machinery by creating a barrier between the moving and stationary parts.


NBR
Steering Oil Seal and Its Impact on Vehicle Steering Mechanism
Choosing Quality Oil Seals for Wheel Hubs and Steering Mechanisms
Table 5: The major special seals, their shapes, and their features
VMQ, also known as silicone, is also used for oil seals, but this is less common because the mechanical strength of VMQ is low and this material has poor wear-resistance This makes it less suitable for dynamic applications, but it can withstand fairly low and high temperatures from -60 °C to 200 °C. Many types of VMQ are also suitable for contact with pharmaceutical and food products, so VMQ is an option worth considering. VMQ oil seals are usually available on request.
How Oil Seals
Start the engine and check for oil leaks round the sump flange. Stop the engine and tighten the mountings.
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Heat resistance
• Rubber torque prevents gear rattling noise
Figure 3: Sealing function of main lip radial load
* KOYO is a registered trademark of JTEKT.