- The oil seal is typically made of rubber or other synthetic materials that are resistant to oil and heat. It is placed in strategic locations within the motor where oil needs to be contained, such as the crankshaft and camshaft seals. These seals are essential for preventing oil leaks that can lead to engine damage and failure.
Oil seal characteristics
• High eccentricity-following lip shape

Heat and attrition are generated by the parts moving against each other. The sealing function can only be ensured if an intentional defined leakage of oil is able to exit for seal lubrication, preventing seal wear and possible failure, while a tight static seal between shaft and sealing lip must be assured when the shaft is stationary.
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Aspects to consider when selecting oil seals
The temperature within the oil seal environment is the main factor that dictates the composition of an oil seal. Generally, there is a range of set temperatures that are optimal for that material. If the operating environment is too cold, the seal may become brittle and, at high temperatures, the seal material may show increased elasticity and become leaky.
If you find a gap, measure it by sliding a feeler gauge under the ruler.