Oil seal is the main cause of oil leakage.

When the wear trench is formed, even if the replacement of new oil seal still can not seal, is due to the contact pressure of lip seal and shaft drop caused after the installation of oil seal lip diameter and shaft diameter of the surplus capacity is too small. Taking S195 diesel engine crankshaft oil seal as an example, this paper analyzes the main reasons for its poor sealing:

①Poor quality oil seal;

②Poor quality of shaft or bearing;

③Improper use and maintenance;

④Improper installation;

⑤Improper storage, adverse effects caused by environmental pollution.