WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Exploded View Of Oil Pump With Torque Specifications
Courtesy of NISSAN MOTOR CO., U.S.A.
Disassemble as shown.
Assembly is in the reverse order of Disassembly. When assembling the oil pump, apply engine oil to the rotors.