Fuel Setting Adjustment

6V4022 INJECTOR TESTER 9. Test pressure valve. 10. Rocker arm. 11. Light switch. 12. Rocker arm control lever. 13. Clamp plate. 14. Light panel. 15. Drain cover. 16. Fluid level indicator.

The test procedures that follow will give an indication of injector condition. Do not use an injector in an engine unless all test results are within the test specifications.

Injector Tester Preparation

Before a new 6V4022 Injector Tester is put to use, some specific procedures must be followed to make sure the tester will operate correctly. Remove drain panel (7) to make sure that the test fluid reservoir is clean, and also that there is a clean filter element in its correct location. Use clean SAE J-967 Calibration Fluid to fill the supply reservoir to its correct level. This is the same type and quality of test fluid as that used in a Caterpillar Fuel Injection Test Bench. Be sure to put drain panel (7) back in position after the reservoir is filled.

TESTER PREPARATION 7. Drain panel. 10. Rocker arm. 17. Test plug.

Install test plug (17) and check the adjustment of rocker arm (10). The roller on the rocker arm must just clear (be just above) the top of test plug (17) when the rocker arm is moved to either the extended or retracted position. If an adjustment is needed, see MAINTENANCE AND ADJUSTMENT PROCEDURES in Special Instruction, Form No. SEHS7788. While test plug (17) is still in position, check the tester for leaks. See LEAK TEST FOR INJECTOR TESTER in this section.

Operation Of The Tester

TESTER NOMENCLATURE 1. Sight tube. 2. Test pressure gauge. 4. Handle. 5. Injector holding block. 9. Test pressure valve. 10. Rocker arm.

Operation of handle (4) backward and forward pumps (sends) test fluid from the reservoir in the base of the tester, through the filter element (in the base), to an inlet check valve and an outlet check valve to test pressure gauge (2), then down to injector holding block (5). When an injector is in position in injector holding block (5), the test fluid fills the injector and the chamber around it, and is then sent to test pressure valve (9), through sight tube (1). It then returns to the reservoir in the base of the tester.

When test pressure valve (9) is in the "CLOSED" position, test fluid cannot go back to the reservoir c when handle (4) is operated. This causes high pressure in injector holding block (5), and in the injector. This high pressure is used to test the injector for external (outer) leakage and leakdown rate (amount of time for pressure drop between the specific pressure limits).