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rotary oil seals

2025-08-16 13:02
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    The 35% represents the estimated failure rate of oil seals in various systems
    22
    22 35 7 oil seal. While oil seals are designed to last for a long time, factors such as improper installation, excessive wear, or chemical exposure can lead to premature failure. When an oil seal fails, it can result in oil leakage, which can damage the components of the system and lead to costly repairs.

    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.