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- Conclusion
- Metallic oil seals consist of a metal casing or carrier that houses a flexible sealing element made of a resilient material such as rubber orPTFE (polytetrafluoroethylene). The sealing element is designed to conform to the surface of the shaft or housing it is,。 The metal casing provides strength and durability, while the flexible sealing element ensures a tight seal even under extreme conditions.
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.
Power Steering Oil Seal:


Heat resistance