As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) A NEWLY INSTALLED ENGINE HAD OIL PRESSURE PROBLEMS. THE LOW OIL PRESSURE AT IDLE WAS FOUND TO BE CAUSED BY THE OIL PRESSURE ADJUSTING SCREW BEING MISALIGNED WITH THE HOUSING CAUSING THE VALVE NOT TO SEAT SQUARELY. THE REPLACEMENT OF THE OIL PRESSURE RELIEF VALVE FIXED THE PROBLEM.