nozzle-holder is to direct the metered
quantity of fuel,
received from the fuel injection pump, into
the engine in a highly atomized, pre-
determined spray pattern.
(2) Each fuel injection nozzle-holder consists
of two assemblies: the holder assembly
and nozzle assembly.
assembly is used to hold the nozzle in its
1. Capscrews (3/4" NC x 7-1/4")
correct position in the cylinder head and
2. Capscrews (5/8" NC x 6")
to provide a means of conducting fuel to
5/8" NC x 7" capscrews at all other
(3) The nozzle consists of a nozzle valve and
a nozzle valve body, in which are located
four equally spaced spray orifices. The
Figure 41. Cylinder head capscrew locations.
nozzle valve body has orifices of .425 mm
(.0167 in.) and may be identified by the
numbers "837" on the valve body.
quence and instructions shown in figure
42. The specified torque is 180-185 ft.
The fuel injection nozzle-holder
lbs. for the 5/8 inch capscrews and 260-
assemblies should be removed after approximately
275 ft. lbs. for the 3/4 inch capscrews.
every 2,000 hours of operation, tested and adjusted if
necessary. The nozzle-holder assembly, when properly
(8) Install fuel injection nozzles, fuel lines,
adjusted, should require an opening pressure of 2900
and covers. When installing the breather
psi to raise the nozzle valve from its seat.
coupling (8, fig. 38) make certain it is in
compensate for initial set of a new nozzle spindle spring,
good condition, and properly positioned in
the specified popping pressure of a new nozzle-holder is
grooves in valve rocker housings.
(9) Fill cooling system.
When adjusting popping pressure of a new nozzle-
(10) Adjust valves. Refer to TM 5-6115400-
holder or a rebuilt nozzle-holder in which a new spindle
spring has been installed, the initial popping pressure
(11) Run engine until coolant reaches a
should be set at 3100-3150 psi.
minimum temperature of 1600 F, then
c. Fuel Injection Nozzle-Holder Removal.
again torque cylinder head capscrews and
Refer to TM 5-6115-400-12.
adjust the valve lash. Inspect engine for
d. Testing and Adjusting Fuel Injection Nozzle-
fuel, water, or oil leaks, and correct any
Holder. To test and properly adjust the fuel injection
nozzles, a nozzle tester similar to the one illustrated in
is required. Test and adjust each nozzle
(1) Each cylinder of the engine is provided
with a multi-hole, differential needle,
Keep hands away from the nozzle tip
hydraulically-lifted fuel injection nozzle-
when popping a nozzle. The finely
holder assembly. The function of each
automized fuel from the nozzle tip is
ejected with such force that it will
penetrate the skin and cause blood
(1) Bolt or clamp nozzle tester to a work