(2) Remove the fuel pump (para 3-20).
(3) Remove the fuel pump drive housing as
illustrated in figure 6-3.
(4) Disassemble the drive system in numer-
ical sequence (34 through 56) as illustrated in
6-6. Fuel Injector
a. General. The fuel injector nozzle assembly
is factory set to open at 2000 psi (pounds per
square inch). The injector nozzle is specially
made with increased running clearance between
the pintle and nozzle bore for hammer applica-
tion.
b. Removal and Disassembly. Remove and dis-
assemble the injector assembly as illustrated in
A, figure 6-6.
c. Checking Spray Pattern.
(1) Assemble the injector on the high pres-
sure fuel line (B, fig. 6-6).
(2) Remove cover plate from pump drive
housing (fig. 3-7).
1
Index marks on window
2
Timing mark
(3) Raise the ram 6 inches with the starting
3
Index marks on window
device and lock hoist brake on crane (fig. 2-8).
4
Timing mark
(4) Open fuel rack.
Figure 6-4. Fuel pump timing.
(5) Insert hand priming lever in the hole
provided in bell crank (fig. 6-5).
(5) Set hammer on a piling or driving head
(6) Using a sharp pull on the priming lever,
and latch in and raise cam about 6 inches. At
hand operate the fuel injection system. The
this time the timing marks (2) should be a min-
nozzle should emit a fine cone shaped fuel spray
imum of 1/32 inch above mark (1). In no case
should timing mark (2) be more than 3/32 inch
Caution: Keep hands and body away from
above index mark (1).
spray path. Pressure is sufficient to cause fuel
to penetrate skin and cause blood poisoning.
6-5. Fuel Pump Drive System
a. General. The fuel pump is operated by a
d. Cleaning, Inspection and Repair.
bell crank lever with a needle-bearing roller which
(1) Clean all parts of the injector assembly,
contacts the machined cam surface of the ram.
except the nozzle, with an approved cleaning sol-
As the upper end of the ram contacts the roller,
vent and dry thoroughly.
the bell crank forces the pump piston downward,
(2) Inspect all parts for cracks, breaks, wear
placing fuel under pressure in the fuel line to
and other damage. Replace a damaged or defec-
the injector.
tive part.
b. Removal and Disassembly.
e. Reassembly and Installation. Reassemble and
(1) Remove the lubricating oil pump (para
install the injector assembly as illustrated in fig-
6-4
