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FUEL SYSTEM
TESTING AND ADJUSTING
INJECTOR CLEANING
22. Injector sleeve.
2.
Remove sleeve (22) and drain all fuel from in-
side the injector.
NOTE: If each injector is cleaned before it is put on the
CHECK BACK OF TESTER FOR LEAKS
tester, the test fluid in the tester will be kept clean, and
18. Fittings. 19. Fluid line and fittings at both ends.
can be used for a longer period of time.
See
20. Fluid line and fittings at both ends. 21. Fittings.
MAINTENANCE AND ADJUSTMENT PROCEDURES in
Special Instruction, Form No. SEHS7788 for more
8.
Other possible locations or areas to check for a
information on the test fluid.
leak are shown in illustration. Check all fittings
and fluid lines similar to those shown.
TEST SEQUENCE
To test fuel injectors, use the sequence that
follows:
I.
Injector Cleaning and Installation
II.
Orifice Inspection
III.
Valve Opening Pressure
IV.
External Leakage
V.
Tip Leakage
VI.
Leakdown Rate
I. Injector Cleaning and Installation
CLAMP PLATE OPEN
1.
Clean the outer surface of the injector before it is
A. Bore for injector. 6. Spray shield. 23. Clamp
tested. Install 6V4172 Injector Sleeve (22) on
plate. 24. Clamp lever.
the injector, to cover the injector fuel ports. This
will keep dirt and other foreign material out of the
3.
Lift clamp lever (24) just enough so it is above
injector. Use clean solvent and a brush to clean
clamp plate (23). Move clamp plate (23) all the
the outside of the injector. After the outside of
way out as shown. Make sure that bore (A), in
the injector is clean, let it become completely
the injector block, is clean. Put spray shield (6)
dry.
on the drain panel.
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