T O 35C2-3-442-2
P-8-627-34
TM 5-6115-457-34
TM-07464A-35
that the gear segment is properly posi-
tioned with the rack.
CAUTION
An injection pump improperly in-
stalled in the "fuel on" side posi-
tion of its gear segment can cause
an engine to overspeed with
resulting serious damage to the
engine and driven equipment.
h. Torque nozzle retaining nut (14,
Figure 8-43. Correct position of gear
segment and rack
i. Torque fuel line nuts from 25 to
35 foot-pounds.
f. Tighten each pump bushing (42, fig-
8-148. INSTALLATION.
ure 8-39) to a torque value of 140 to
160 foot -pounds.
a. Installation of the fuel injection
group is accomplished during reassembly
CAUTION
A misaligned fuel injection pump
b. Install utility governor group (para-
can cause an engine to overspeed
graph 8-140).
with resultant damage to engine,
t u r b o c h a r g e r , and compressor.
c. Refer to Operator and Organiza-
tional Maintenance Manual and install
g. Measure the rack travel to make
overspeed switch, hydraulic oil filter (pre-
sure that the plunger gear segment is
cise generator sets only), and secondary
properly meshed with the fuel rack. The
fuel filter and relief valve group.
gear segment and rack are so constructed
that the maximum travel of the rack in
8-149. TESTING.
either direction can be obtained only when
the fourth tooth of the gear segment is
a. TEST FUEL INJECTION VALVES
meshed with the fourth notch on the fuel
FOR SPRAY CHARACTERISTICS, VALVE
rack (figure 8-43). If the gear segment is
OPENING PRESSURE AND LEAKING
misplaced in either direction, the rack
RATE. Using a suitable diesel injector
travel will be reduced in both directions.
pump test stand and diesel injector tool
It is, therefore, necessary to measure the
test set, perform the following:
rack travel in only one direction to make
certain that the gear segment is properly
1. Before testing the valve assem-
meshed with the fuel rack. This is meas-
bly (13, figure 8-39), inspect screen filter.
ured by using the rack setting gauge (fig-
If the screen is broken or clogged, discard
ure 8-41). The rack is moved to its
extreme fuel on position. A minimum
the valve assembly (13). If the screen ap-
pears normal, test the valve assembly (13).
reading of +0.312 on the gauge indicates
8-92
Change 8
