Mounting seal runner onto aircraft powerplant rotor

1 . A method for assembling a structure of an aircraft powerplant, comprising:

aligning a seal runner coaxial with a rotor of the aircraft powerplant, the seal runner including a runner mount and a seal land disposed radially outboard of the runner mount, the runner mount projecting axially along an axis to a distal end of the seal runner, and the rotor projecting axially along the axis to a distal end of the rotor; and

mounting the seal runner onto the rotor using an installation tool, the installation tool including an inner locating surface and an outer locating surface, the inner locating surface axially recessed from and radially inboard of the outer locating surface, and the mounting of the seal runner comprising axially pressing the runner mount onto the rotor by moving the installation tool axially towards the rotor, with the outer locating surface axially pressed against the distal end of the seal runner, until the inner locating surface axially engages the distal end of the rotor;

wherein, after the seal runner is mounted onto the rotor using the installation tool, the runner mount is attached to the rotor through a radial interference fit between the runner mount and the rotor and the runner mount is axially disengaged from the rotor.

2 . The method of claim 1 , wherein, after the seal runner is mounted onto the rotor using the installation tool, the runner mount is axially unloaded against the rotor.

3 . The method of claim 1 , wherein, after the seal runner is mounted onto the rotor using the installation tool, a shoulder of the runner mount is located axially next to, but does not contact, a shoulder of the rotor.

4 . The method of claim 1 , wherein, after the seal runner is mounted onto the rotor using the installation tool, the distal end of the seal runner is axially recessed from the distal end of the rotor.

5 . The method of claim 1 , wherein the installation tool further includes a guide surface that circumscribes and radially contacts the runner mount during the mounting of the seal runner.

6 . The method of claim 5 , wherein

during the mounting of the seal runner, the runner mount projects axially into a receptacle in the installation tool;

the receptacle extends radially within the installation tool out from the axis to the guide surface; and

the receptacle projects axially along the axis into the installation tool from a distal end of the installation tool to the inner locating surface and the outer locating surface.

7 . The method of claim 1 , further comprising removing the installation tool following the mounting of the seal runner.

8 . The method of claim 1 , further comprising arranging a seal element with the seal runner such that the seal element radially sealingly engages the seal land.

9 . The method of claim 1 , wherein the runner mount and the rotor are at room temperature when the runner mount is pressed onto the rotor.

10 . The method of claim 1 , further comprising heating the seal runner such that the runner mount is at a higher temperature than the rotor when the runner mount is pressed onto the rotor.

11 . The method of claim 1 , wherein

the rotor includes a rotor base and a rotor notch, the rotor base projects axially along the axis to the distal end of the rotor, the rotor notch projects axially along the axis into the rotor base from the distal end of the rotor to a shoulder of the rotor base;

the runner mount includes a mount base and a mount rim located at the distal end of the seal runner, the mount base projects axially along the axis to the distal end of the seal runner, and the mount rim projects radially inward towards the axis from the mount base; and

after the seal runner is mounted onto the rotor using the installation tool, the mount base is attached to the rotor base through the radial interference fit and the mount rim is disposed in the rotor notch axially next to the shoulder of the rotor base.

12 . The method of claim 11 , wherein the mount rim is axially spaced from the shoulder of the rotor base.

13 . The method of claim 11 , wherein the mount rim is radially spaced from the rotor base.

14 . The method of claim 1 , wherein the seal runner further includes a runner arm radially between and connected to runner mount and the seal land.

15 . The method of claim 14 , wherein

the distal end of the seal runner is a first end of the runner mount, and the runner mount extends axially along the axis from the first end of the runner mount to a second end of the runner mount; and

the runner arm is disposed at the second end of the runner mount.

16 . The method of claim 14 , wherein

the seal land extends axially along the axis from a first end of the seal land to a second end of the seal land; and

the runner arm is connected to the seal land at an intermediate location axially between the first end of the seal land and the second end of the seal land.

17 . The method of claim 1 , wherein the aircraft powerplant comprises a gas turbine engine.

18 . A method for assembling a structure of an aircraft powerplant, comprising:

arranging a seal runner with a rotor of the aircraft powerplant, the seal runner including a runner mount and a seal land disposed radially outboard of the runner mount, the runner mount projecting axially along an axis to a distal end of the seal runner, and the rotor projecting axially along the axis to a distal end of the rotor; and

mounting the seal runner onto the rotor using an installation tool, the installation tool including an inner locating surface and an outer locating surface, the inner locating surface axially recessed from and radially inboard of the outer locating surface, and the mounting of the seal runner comprising axially pressing the runner mount onto the rotor by moving the installation tool axially towards the rotor, with the outer locating surface axially pressed against the distal end of the seal runner, until the inner locating surface axially engages the distal end of the rotor;

wherein, after the seal runner is mounted onto the rotor using the installation tool, the runner mount is attached to the rotor through a radial interference fit between the runner mount and the rotor and the runner mount is axially unloaded.

19 . The method of claim 18 , further comprising removing the installation tool following the mounting of the seal runner and prior to full assembly of the aircraft powerplant.