Oil Pump: Disassembly

Using the ST, place the oil pump in the vise, and remove the 4 bolts holding the rear cover.
ST 34199AE020 ATTACHMENT

Fig 1: Locating Rear Cover Bolts
Courtesy of SUBARU OF AMERICA, INC.
Remove the pressure plate.

Fig 2: Removing Pressure Plate
Courtesy of SUBARU OF AMERICA, INC.
Use a screwdriver to pry the retaining ring.
CAUTION: Do not remove the cam rings and rotors.

Fig 3: Prying Retaining Ring Using Screw Driver
Courtesy of SUBARU OF AMERICA, INC.
Install the pressure plate.
Temporarily tighten the rear cover to the front casing.
Remove the oil pump pulley.

Fig 4: Removing Oil Pump Pulley
Courtesy of SUBARU OF AMERICA, INC.
Place the oil pump in the vice.
CAUTION: Do not place the oil pump in the vise directly. Support the oil pump lightly using soft pads to protect it.
Use a screwdriver to pry the oil seal out.
CAUTION: Be careful not to scratch the inner surface of the casing.

Fig 5: Prying Oil Seal Using Screw Driver
Courtesy of SUBARU OF AMERICA, INC.