STAIRWAY GP 5049081 - Caterpillar

Illustration 2 g00398982
Pressure test the fuel injection nozzle by using the 5P-4150 Nozzle Testing Group . (11) 5P-7448 Adapter (12) Fuel injection nozzle (13) 5P-4721 Tube (14) 1U-8857 Extension (15) 8S-2270 Fuel Collector (16) 8T-5313 Filter
Do not use dirty test fluids when you test fuel injection nozzles. Also, do not test fuel injection nozzles unless you have the correct service tools.The use of dirty test fluids and the use of incorrect service tools will result in damage to fuel injection nozzles.
Note: This procedure is a test of the first opening pressure of the fuel injection nozzle. The test for the second opening pressure of the fuel injection nozzle can not be performed by using this procedure. A test of the second opening pressure requires the disassembly of the fuel injection nozzle and the use of special shims. Disassembly of the fuel injection nozzles may invalidate the standards for emissions of the engine.
Connect fuel injection nozzle (12) to the tooling that is shown in Illustration 2.The spray from the fuel injection nozzle must be directed into 1U-8857 Extension (14) and 8S-2270 Fuel Collector (15) .Refer to the table in the Specifications Module, "Fuel Injection Nozzles" topic for the correct pressure settings. If the opening pressure is not within the range of the setting which is given in the table, the fuel injection nozzle must be replaced.Use clean 6V-6068 Calibration Fluid when the fuel injection nozzles are tested. The calibration fluid is similar to SAE J-967 (ISO 4113) oil.
Close the gauge protector valve. Close the shutoff valve. Open the pump isolator valve. Flush the fuel injection nozzle by operating the nozzle tester. Operate the nozzle tester for 10 to 15 strokes at a rate of approximately sixty strokes per minute.
Open the gauge protector valve. Slowly increase the pressure until the valve in the fuel injection nozzle opens. Note the highest pressure indication on the dial indicator before the pointer moves to 0 kPa (0 psi). This highest pressure indication is the opening pressure of the fuel injection nozzle. The opening pressure will happen when valve needle rises from the nozzle seat.Refer to the table in the Specifications Module, "Fuel Injection Nozzles" topic for correct pressure settings. If the opening pressure is not within the range of the setting that is given in the table, the fuel injection nozzle must be replaced.Back Leakage Test
Connect fuel injection nozzle (12) to the tooling that is shown in Illustration 2.Position the fuel injection nozzle so that the direction of the fuel spray is into 1U-8857 Extension (14) and 8S-2270 Fuel Collector (15) .
Pump the pressure to about 1030 kPa (150 psi) below the opening pressure of the fuel injection nozzle. Refer to the Specifications Module, "Fuel Injection Nozzles" topic for the correct setting of the opening pressure. Release the handle. When the pressure begins to decrease, note the time that is required for the pressure to decrease to approximately 0 kPa (0 psi). If the fuel