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Significance of Quality Seals in Automotive Applications:
- Over time, spark plugs can become fouled with carbon deposits, which can hinder their ability to produce a strong spark. This can lead to hard starting, rough idling, and poor performance from your snowblower. By replacing the spark plug with a new one, you can ensure that your snowblower starts up easily and runs smoothly, even in the coldest winter weather.
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.

Oil seal size
Maintenance and Replacement of Gaskets


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.