One way to recognize an improperly installed seal is by checking whether or not there is uneven shearing of the rubber after use. If this is evident, adjust by aligning the installation tools properly before pressing the seal into place.
As type B with dust lip
One common type of oil seal is the lip seal, also known as radial shaft seal. This type of seal consists of a flexible lip that fits tightly against the shaft, preventing the oil from leaking out. Lip seals are typically made from rubber or elastomeric materials, which provide a good seal and resistance to oil and other fluids. They are commonly used in engines, gearboxes, and hydraulic systems.The most common oil seals are the ERIKS types R, RST, M and MST, which correspond respectively to types A, AS, B and BS according to DIN 3760/ISO 6194.