Tight seal of oil seal is the main factor causing oil leakage. When the shaft is worn and grooved, even if the new seal can not be sealed, it is because the contact pressure between the seal lip and shaft decreases, resulting in too small interference between the seal lip diameter and shaft diameter after installation. Taking S195 diesel engine crankshaft oil seal as an example, the main reasons for its poor sealing are:
The quality of oil seal manufacturing is poor.
The quality of shaft or bearing is poor.
Improper use and maintenance;
4. Improper installation;
Improper storage and adverse effects caused by environmental pollution.