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 TM 55-1905-221-14-2
5-18. FUEL INJECTOR (Continued).
n. On the return upward movement of the plunger, the high pressure cylinder within the bushing is again filled with
fuel oil through the ports, the constant circulation of fresh cool fuel through the injector renews the fuel supply in the
chamber, helps cool the injector and also effectively removes all traces of air which might otherwise accumulate in the
system and, interfere with accurate fuel metering.
o. The fuel injector outlet opening through which the excess fuel oil returns to the fuel return passage and then
back to the fuel tank, is directly adjacent to the inlet opening, and contains a filter element exactly the same as that in the
inlet side.
p. Changing the position of the helices, by rotating the plunger, retards the advances of the closing of the ports,
and the beginning or ending of the injection period. At the same time, it increases or decreases the amount of fuel
injected into the cylinder. The figure below shows the various plunger positions from NO LOAD to FULL LOAD. With the
control rack pulled out all the way (no injection), the upper port is not closed by the helix until after the lower port is
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