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Always start by making sure the oil seal is facing the right direction. The oil seal must be positioned with its spring to the side of the medium to be sealed. The oil seal must then be pressed into the bore. It must fit tightly (H8 in the groove is recommended). Use appropriate tools for this, such as an impact socket set, to ensure that the force is applied evenly during pressing. The oil seal must never be hammered into the bore with brute force, but eased in.
Sealing principle: Since there is an oil film controlled by the oil seal edge between the oil seal and the shaft, the oil film has fluid lubrication characteristics.
PTFE Lip seals
Intake Valve Cover Gasket: Importance in Engine Functionality
Figure 4 shows the features of a JTEKT oil seal.
Cold rolled carbon steel sheet
(JIS* SPCC)

oil seal 50 * 72 * 10.