RETAINER FOR UNITARY SEAL ASSEMBLY

A seal assembly is for sealing an annular space between a shaft and a housing, the housing having a bore and a radial end surface extending outwardly from the bore. The seal assembly includes an outer case disposeable within the housing bore, configured to support a primary seal member and having a radially-outwardly extending flange disposeable against the housing radial surface, the flange defining an annular groove. An inner case is disposed within the outer case and is disposeable upon the shaft. An annular retainer formed of a rigid polymeric material has an outer radial end disposed within the flange groove, an inner radial end disposeable about the shaft and a radial retention surface. The retainer retention surface extends between the inner and outer ends and is contactable by the inner case so as to retain the inner case disposed within the outer case.