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Figure 3-18. Fuel injector control lever and tube assembly, removal and installation.
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Figure 3-21. Defective fuel injector plungers.
tag indicates the nominal output of the injector in
3-14. Fuel Injector (Crown Valve)
cubic millimeters.
a. General.
(3) Each injector control rack is actuated by a
(1) The fuel injector performs four functions.
lever on the injector control tube which, in turn, is
(a) Creates high fuel pressure required for
connected to the governor by means of a fuel rod.
efficient injection.
The levers can be adjusted independently on the
(b) Meters and injects fuel to exact amount
control tube, thus permitting a uniform setting of
required to handle load.
all injector racks (para 3-13 g).
(c) Atomizes fuel for mixing with air in the
b. Removal. Refer to figure 3-20 and remove fuel
combustion chamber.
injectors and fuel lines.
(d) Permits continuous fuel flow.
NOTE
( 2 ) Each fuel injector has a circular disc
Install clean shipping caps on the injector fuel inlet
pressed into a recess at the front side of the injector
and outlet and on the fuel connectors. Cover the
body for identification purposes. The identification
injector hole in the cylinder head to keep out foreign
Figure 3-20. Fuel injector, removal and installation.
c. Fuel Injector Testing.
maintain a pressure of 1600 to 2000 psi. Inspect
for leaks. Relieve test pressure slowly  - to prevent
and p l u n g e r m o v e m e n t .
(1) Injector
rack
Check to see if the plunger works freely in its
damage to test gage.
WARNING
bushing by placing injector against a bench and
The injector must always be held in
depressing follower to the bottom of its stroke while
such a way as to prevent any fuel from
moving the rack back and forth. Failure to produce
penetrating a person's skin. Fuel which
a free rack indicates internal parts of injector are
e n t e r s the blood stream could cause
dirty or damaged (fig. 3-21). With injector
s e r i o u s infection or death.
m o u n t e d in test stand (fig. 3-22) pump and

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