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2025-08-14 16:35
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    Lastly, the 7% signifies the recommended maximum allowable radial deflection for an oil seal35 47 7 oil seal. This parameter is vital because it determines the seal's ability to withstand pressure and maintain its integrity. Exceeding this limit can lead to deformation, compromising the seal's sealing capacity and potentially causing leaks. Engineers must consider factors such as operating pressure, temperature, and shaft eccentricity to ensure the seal remains within this tolerance.

    Operating temperatures for engine oil seals (see Fig. 14.11 and cross-section of lip seal with garter spring in Fig. 14.22) vary widely, depending on engine design and location within the engine. Typically, the rear crankshaft seal is subjected to much higher temperatures than the front seal. Oil sump temperatures vary considerably, depending on provisions for oil cooling. This allows use of hydrogenated nitrile (HNBR), silicone, or acrylic elastomers for some seals in relatively low-temperature environments (120–140°C or 250–284°F). Standard fluoroelastomers (FKM), bisphenol-cured VDF/HFP/TFE terpolymers with 68–69% fluorine content, perform well in oil service up to about 160°C (320°F). More resistant fluoroelastomers are necessary for reliable long-term performance in more severe environments.