Oil Pump: Disassembly

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

Fig 1: Removing Bolts Holding Using Mount ST 34199AE020
Courtesy of SUBARU OF AMERICA, INC.
Remove the pressure plate.

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

Fig 3: Removing Cam Rings And Rotors
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 screw driver to pry the oil seal out.
CAUTION: Be careful not to scratch the inner surface of the casing.

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