The NC 251 Tester can be used for testing

  1. Without removing the injector from the engine:
    • recommended values of the injector opening pressure
    • free movement of the nozzle needle by watching the deflections of the pressure gauge pointer.
  2. After removing the injector from the engine:
    • the opening pressure of the injector
    • the free movement of the nozzle needle
    • the nozzle seat for leakage
    • the delivery pipe for leakage