2 minute read
Engine Speed Measurement
TESTER NOMENCLATURE 1. Sight tube. 2. Test pressure gauge. 4. Handle. 5. Injector holding block. 9. Test pressure valve. 10. Rocker arm. 12. Rocker arm control lever.
When test pressure valve (9) is in the "OPEN" position, the operation of handle (4) causes test fluid to be sent to the injector. Use control lever (12) to extend or retract rocker arm (10). The External Leakage Test, Tip Leakage Test and the Leakdown Rate Test must each be done with the rocker arm in the retracted position. The Valve Opening Pressure Test and the Orifice Inspection Test are each done with the rocker arm in the extended position.
Leak Test For Injector Tester
1. The 6V4022 Injector Tester must be checked with a leak test to make sure that there are no leaks within the tester. Do this test at regular intervals to be sure of good operation of the tester. This test can be done at any time, either before or after a test of an injector or a group of injectors.
LEAK TEST 1. Sight tube. 4. Handle. 9. Test pressure valve. 17. Test plug.
2. Install test plug (17) and then pump (operate) handle (4) to remove air from the system.
3. Turn test pressure valve (9) to the "CLOSED" position and use handle (4) to increase the pressure above 13 000 kPa on test pressure gauge (2). PRESSURE MUST NOT GO ABOVE 15 000 kPa.
4. When handle (4) is released, the pressure will always drop some amount. If the pressure has now dropped below the 13 000 kPa, move the handle just enough to maintain 13 000 kPa (or more) when handle is released.
5. If necessary, slightly open test pressure valve (9) to lower the pressure to the desired 13 000 kPa and close valve (9).
6. Pressure must not drop to 12 500 kPa in less than 7 minutes.
LEAK TEST SPECIFICATION FOR INJECTOR TESTER
Maximum Pressure Drop Minimum Time Interval 500 kPa 7 Minutes
TESTER LEAK TEST PRESSURE RANGE (7 MINUTES)
7. If the test shows too much leakage, find the leakage source and make the necessary repair. Check the seals on test plug (17). Test pressure valve (9) is also a possible leak source. This leakage can possibly be seen at sight tube (1).
