Never use a used seal in another project as it may develop defects such as cracks or bubbles in the seal lip previously used.
In addition to direct financial considerations, there is an environmental cost associated with spark plugs. As they age and lose efficiency, the increased fuel consumption leads to higher greenhouse gas emissions. Therefore, regularly maintaining and replacing spark plugs contributes to reducing a vehicle's carbon footprint.A standard oil seal consists of an outer circular metal disk with an inner flexible rubber which is affixed to the metal during vulcanization. The bonded seal has no loose parts to allow leakage of oil or ingress of any contaminants. This kind of seal is more accurate, and can easily be fitted into a smaller space. An example is shown in Figure 2.9.
J: Additional code is added here as an identifier when two or more seals have exactly the same type codes and dimensional numbers.