Resiliently deformable seal runner

An aircraft engine, comprising:

• a shaft rotatable about a central axis;
• a housing mounted around the shaft, the shaft rotatable relative to the housing;
• and
• a seal assembly disposed radially between the shaft and the housing relative to the central axis, the seal assembly having:
• a sealing ring mounted to the housing, and
• a seal runner secured to the shaft, the seal runner extending radially relative to the central axis from an inner face facing the shaft to an outer face facing the sealing ring and being radially spaced apart from the sealing ring by a gap, the seal runner resiliently deformable from an at-rest shape where no axial compression force is exerted on the seal runner to a pre-loaded shape where the seal runner is axially clamped on the shaft by an axial compression force,
• an outer diameter of the outer face greater in the pre-loaded shape than in the at-rest shape;
• wherein the inner face has a curved section having a first curvature in the at-rest shape and a second curvature in the pre-loaded shape, the second curvature greater than the first curvature.