CYLINDER AS 2871991 - Caterpillar

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.
Connect fuel injection nozzle (9) to the tooling that is shown in Illustration 3. The spray from the fuel injection nozzle must be directed into the 1U-8857 Extension (11) and the 8S-2270 Fuel collector (12).Refer to the table in the Specifications Module, "Fuel Injection Nozzles" 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 equivalent to SAE J-967 (ISO 4113) oil.
Close the gauge protector valve. Close the shutoff valve. Open the pump isolator valve. In order to flush the fuel injection nozzle, operate the nozzle tester for 10 to 15 strokes at a rate of approximately 60 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 is defined when valve needle (16) is lifted from the valve seat.
Refer to the table in the Specifications Module, "Fuel Injection Nozzles" 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 (9) to the tooling. Refer to Illustration 3 for more information. Position the fuel injection nozzle so that the direction of the fuel spray is into the 1U-8857 Extension (11) and the 8S-2270 Fuel collector (12).
Pump the pressure to about 1030 kPa (150 psi) below the opening pressure of the fuel injection nozzle. Refer to Specifications Module, "Fuel Injection Nozzles" 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 injection nozzle is not faulty, the time will not be less than 5 seconds or more than 45 seconds.
When the test in Step 2 is done, look for any leakage from the pressure faces of the holder and the retaining nut of the fuel injection nozzle. If leaks are visible, make sure that the components are tightened to the correct torque. Do not overtighten the components in order to stop the leakage. Instead, a pressure test on the fuel injection nozzle must be conducted. This test may force any foreign particles out of the nozzle. If the tests for the fuel injection nozzle are satisfactory, test the fuel injection