Except For STI Model

WARNING: This page is about a different car, the 2013 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the cable from the terminal M of the magnet switch assembly.

Fig 1: Identifying Magnet Switch Assembly Terminal M
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Remove the magnet switch assembly from the starter housing assembly.

Fig 2: Locating Starter Housing Assembly To Magnet Switch Assembly Mounting Bolts
Courtesy of SUBARU OF AMERICA, INC.
Remove screws (A) of the brush holder assembly, and through bolts (B) on both sides, and remove the starter cover assembly.

Fig 3: Identifying Brush Holder Assembly Mounting Bolts
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Remove the brush holder assembly from the armature assembly.
NOTE: Hold the brush with your fingers so that the brush spring does not come flying out.

Fig 4: Removing Brush Holder Assembly From Armature Assembly
Courtesy of SUBARU OF AMERICA, INC.
Remove the armature assembly and yoke assembly from the starter housing assembly together as a single unit.

Fig 5: Identifying Armature And Yoke Assembly
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Separate the armature assembly and yoke assembly.

Fig 6: Disassembling/Assembling Armature And Yoke Assembly
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Remove the pinion gear from the internal gear assembly.

Fig 7: Identifying Pinion Gear And Internal Gear Assembly
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Remove seal rubber (A), plate (B), and seal rubber (C).

Fig 8: Removing/Installing Starter Seal Rubber And Plate
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Lightly tap the starter housing assembly with a plastic hammer as shown in the figure, and remove the overrunning clutch, internal gear assembly, shaft and shift lever together as one unit.

Fig 9: Tapping Starter Housing Assembly Using Plastic Hammer
Courtesy of SUBARU OF AMERICA, INC.

Fig 10: Disassembling/Assembling Overrunning Clutch, Internal Gear Assembly, Shaft And Shift Lever
Courtesy of SUBARU OF AMERICA, INC.
Use the following procedures to remove the overrunning clutch from the shaft.
1. Use an appropriate tool (such as a fit socket wrench), and remove the stopper from snap ring by lightly tapping the stopper with a plastic hammer.
  
  Fig 11: Removing Stopper From Snap Ring Using Hammer
  Courtesy of SUBARU OF AMERICA, INC.
2. Remove snap ring (A) from the shaft, and remove stopper (B).
  
  Fig 12: Removing Snap Ring From Shaft
  Courtesy of SUBARU OF AMERICA, INC.
3. Remove the overrunning clutch from the shaft.
  
  Fig 13: Removing/Installing Shaft Overrunning Clutch
  Courtesy of SUBARU OF AMERICA, INC.
Separate the internal gear assembly and shaft.

Fig 14: Separating/Connecting Internal Gear Assembly And Shaft
Courtesy of SUBARU OF AMERICA, INC.