An axial face seal assembly is disclosed, and arranged for co-rotation with a drive shaft in a rotary machine. The seal assembly comprises a seal member (1) which is seated in a carrier (4) to present a sealing end face (2), the carrier being non- rotatably connected to a base member (6) but movable axially thereto and biased from the base member by means of a compression spring (5) which is interposed between the base member and the carrier, the base member being axially and non- rotatably securable to a drive shaft by means of an open ring clamp (7) having first end second ends (17; 18). The ring clamp is supported on the base member, at least one of said first and second ends (17; 18) being movable relative to the other end in a circumferential direction; and wherein tightening means (8) is rotatably journalled on the base member for adjusting the relative distance between the first and second ends of the ring clamp. A mounting fixture (9) is likewise disclosed and cooperating with the seal assembly in a mounting procedure requiring axial access only to the seal assembly.
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