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 FUEL SYSTEM
TESTING AND ADJUSTING
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
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.
TESTER NOMENCLATURE
Injector Tester Preparation
1. Sight tube. 2. Test pressure gauge. 4. Handle.
5. Injector holding block. 9. Test pressure valve.
Before a new 6V4022 Injector Tester is put to
10. Rocker arm.
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
Operation of handle (4) backward and forward
clean, and also that there is a clean filter element in its
pumps (sends) test fluid from the reservoir in the base of
correct location. Use clean SAE J-967 Calibration Fluid
the tester, through the filter element (in the base), to an
to fill the supply reservoir to its correct level. This is the
inlet check valve and an outlet check valve to test
same type and quality of test fluid as that used in a
pressure gauge (2), then down to injector holding block
Caterpillar Fuel Injection Test Bench. Be sure to put
(5). When an injector is in position in injector holding
drain panel (7) back in position after the reservoir is
block (5), the test fluid fills the injector and the chamber
filled.
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).
TESTER PREPARATION
7. Drain panel. 10. Rocker arm. 17. Test plug.
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