Non-Turbo Model

Remove the nut and detach oil pump pulley.
Remove the stay from the oil pump.
Remove the four bolts which secure rear cover.

Fig 1: Removing Four Bolts (Non-Turbo Model)
Courtesy of SUBARU OF AMERICA, INC.
Using a screwdriver, pry the retaining ring off.

Fig 2: Removing Retaining Ring
Courtesy of SUBARU OF AMERICA, INC.
Extract the shaft from the front casing.
Remove the following parts from the front casing.
CAUTION: Discard old seal washer; replace with a new one.

Fig 3: Removing Seal Washer
Courtesy of SUBARU OF AMERICA, INC.
Pry the oil seal off using a screwdriver.
CAUTION: Be careful not to scratch inner surface of casing.

Fig 4: Removing Oil Seal
Courtesy of SUBARU OF AMERICA, INC.
Remove the pressure switch.
Slightly loosen the outlet connector, and remove the connector.

Fig 5: Removing Pressure Switch
Courtesy of SUBARU OF AMERICA, INC.