Oil Pump: Disassembly
WARNING: This page is about a different car, the 2002 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.
Remove the screws which secure oil pump cover and then disassemble oil pump. Inscribe alignment marks on inner and outer rotors so that they can be replaced in their original positions during reassembly.
CAUTION:
Before removing the relief valve, loosen plug when removing the oil pump from cylinder block.