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.
CAUTION:
Before installation, apply new engine oil to the parts as instructed in the figure above.