high oil pressure

Hello I have an isuzu 2.8 Turbo Diesel Motor 4JB1 I just made the new engine Change New Oil Pump and now the pressure is high, in 80 in cold regulating, then it accommodates, but at 80 Kmen Quinta begins to exceed 70 pounds of pressure.
Consultation: Could it be the oil relief valve, which downloads to the 4 cañitos that it is locked or broken? Or the valve that is incorporated into the oil pump that has come badly calibrated, since it is new?