A main shaft bearing compartment seal system comprising: a cylindrical inner diameter bore; a seal assembly juxtaposed substantially adjacent to a portion of the cylindrical ID bore, wherein the seal assembly comprises: a carbon seal housing comprising a first step and a second step; a piston ring, wherein the piston ring is cylindrical and substantially surrounds the cylindrical ID bore and the carbon seal housing comprises a carrier configured to hold the piston ring, wherein a portion of the carbon seal housing circumferentially wraps around both the piston ring and the portion of the cylindrical ID bore; and a spring configured to interface with a piston ring face of the piston ring at a spring face, and configured to position the piston ring within the carbon seal housing; wherein a portion of the piston ring is positioned radially in between the first step and the portion of the cylindrical ID bore, and forms a gap between the piston ring and the carbon seal housing adjacent the second step; and wherein the spring is positioned axially adjacent the piston ring and radially in between the second step and the portion of the cylindrical ID bore; wherein the first step of the carbon seal housing extends to physically interfere with an OD (bottom) surface of the piston ring in response to inserting the piston ring within the carbon seal housing backwards; and wherein a width, measured axially, of the second step is such that the second step is sized to prevent the spring from entering the gap formed between the piston ring and the carbon seal housing. a cylindrical inner diameter bore; a seal assembly juxtaposed substantially adjacent to a portion of the cylindrical ID bore, wherein the seal assembly comprises: a carbon seal housing comprising a first step and a second step; a piston ring, wherein the piston ring is cylindrical and substantially surrounds the cylindrical ID bore and the carbon seal housing comprises a carrier configured to hold the piston ring, wherein a portion of the carbon seal housing circumferentially wraps around both the piston ring and the portion of the cylindrical ID bore; and a spring configured to interface with a piston ring face of the piston ring at a spring face, and configured to position the piston ring within the carbon seal housing; a carbon seal housing comprising a first step and a second step; a piston ring, wherein the piston ring is cylindrical and substantially surrounds the cylindrical ID bore and the carbon seal housing comprises a carrier configured to hold the piston ring, wherein a portion of the carbon seal housing circumferentially wraps around both the piston ring and the portion of the cylindrical ID bore; and a spring configured to interface with a piston ring face of the piston ring at a spring face, and configured to position the piston ring within the carbon seal housing; wherein a portion of the piston ring is positioned radially in between the first step and the portion of the cylindrical ID bore, and forms a gap between the piston ring and the carbon seal housing adjacent the second step; and wherein the spring is positioned axially adjacent the piston ring and radially in between the second step and the portion of the cylindrical ID bore; wherein the first step of the carbon seal housing extends to physically interfere with an OD (bottom) surface of the piston ring in response to inserting the piston ring within the carbon seal housing backwards; and wherein a width, measured axially, of the second step is such that the second step is sized to prevent the spring from entering the gap formed between the piston ring and the carbon seal housing.