What was found
WHEN REASSEMBLING THE OIL PUMP, IT WAS NOTED THAT DESPITE ATTEMPTS TO CENTER THE OIL PUMP BODY, THE IMPELLERS WOUL BIND WITH TORQUE APPLIED TO THE HOUSING. ALL DIMENTIONAL INSPECTIONS WERE WITHIN LIMITS. THE PROBLEM DISAPPEARED AFTER REPLACING THE COMBINATION OF THE OIL PUMP HOUSING AND DRIVEN IMPELLER. IT IS ASSUMED THAT THERE WAS A MACHING ALIGNMENT ERROR IN THE HOUSING, DRIVEN IMPELLER SHAFT, OR POSSIBLY A COMBINATION OF BOTH.