Opening Pressure

A reliable tester is required to perform test. Use clean Test Oil (SAE J9670). Care must be taken not to damage gauge with excessive pressure. Connect test line to nozzle holder assembly and tighten fittings.
CAUTION: When performing test, DO NOT place hands or arms near tip of nozzle. The atomized high pressure spray from nozzle has power to penetrate flesh and destroy tissue, and may result in blood poisoning. The tip should always be enclosed in a receptacle, preferably a transparent type, to contain spray.
Close gauge valve and operate tester handle sharply several times and check for proper nozzle position. Spray should be injected into a clean container.
Open gauge valve and operate tester handle slowly to determine injector opening pressure. Observe gauge reading just before oil is sprayed from tip. A buzzing noise will occur when spray is injected. Minimum opening pressure is 1706 psi (120 kg/cm² ).