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- The half moon configuration of this gasket is specifically tailored to the contours of the engine's valve train. It seals the gaps between the valve stems and the valve cover, ensuring that oil stays within the designated channels. This unique shape allows for a more secure fit, reducing the likelihood of leaks and improving overall engine performance.
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As the pressure increases, the radial load and the friction of the sealing lip increase in contact with the shaft. As with temperature, each oil seal has a recommended pressure for optimum performance. Excessive pressure causes the seals to wear more quickly and consequently have a shorter life.
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.
Seals, including oil seals, have undergone a great development in recent years and are totally unlike the original product. PTFE has taken over the oil seals market for modern engines mainly because traditional oil seals started causing more and more problems. Such as evaporation of chemical plasticisers from the elastomeric material, which eventually caused engine oil leakage. Now, the focus is more on durability and frequency of servicing.
Garter springs are generally used when the lubricant is oil, as it provides the necessary downward force to maintain a tight seal. However, when grease is the lubricant, garter springs can often be eliminated. Due to its low viscosity, grease doesn’t require as much downward force to maintain an effective seal.
Sealing process
Advantages:
– Good static sealing
– Compensation of different thermal expansion
– Reduced risk of fretting corrosion
– Effective protection against air side contaminants
– Higher bore surface roughness is allowed
– Installation in split-housings
– Modern lip design provides low radial forces
Quality assurance and compliance with industry standards are paramount in oil seal manufacturing. Leading companies in the sector adhere to stringent quality control measures to ensure that their products meet or exceed industry specifications. Compliance with regulatory requirements and industry standards is essential to provide customers with reliable and high-performance sealing solutions for their specific applications.
If the gap is larger than 0.002 in. (0.05 mm) at any point, have the head or block checked and machined flat by a specialist.