Oil seal is an important part of lubricating seal.In the use of installation should be noted:A.1. Clean and qualified lubricating oil shall be used.If there are impurities in the oil, its entry into the lip will not only accelerate the wear of the lip and shaft neck, but also damage the surface tension of the oil film, resulting in oil seal leakage.2. The diesel engine shall not overspeed or change sharply in speed.3. The technology of air filter must be kept in good condition, otherwise the dust in the air into the cylinder, on the one hand, to speed up the cylinder and piston ring wear, on the other hand, with the suitable cylinder wall lubricating oil into the oil sump oil pollution, cause the abrasion of oil seal, lead to the oil.