Repeat the process of installing oil seals for any other locations where they are required. Be sure to follow the same steps for each installation to ensure a leak-free performance.
This is one of the frequent reasons for oil seal failure, and this is majorly because of the volatility of any of the elastomer’s constituents. These causative constituents may be part of the elastomer formulation, or gases that got entrapped in the elastomer during the molding process. The deceiving fact about this failure is that sometimes the oil seal won’t show any visual sign of out-gassing, however, sometimes when the out-gassing is extreme, they shrink.

Rotary Wheel Of Auto Parts
OS/MOS: Designates if dimensions are displayed in inches or millimeters
DIN


The metal case and spring material used in the oil seal should be selected based on the substance to be sealed.
Table 6 shows how to select the metal case and spring materials.