TM 5-4310-354-14
Section III. FUEL INJECTION NOZZLES
7-5. General. The fuel injection nozzles receive fuel
(3) Replace damaged fuel nozzle and holder
under high pressure from the fuel injection pump via the
as an assembly.
fuel injection lines. The fuel charge is properly timed to
engine operation so that the nozzle introduces a finely
d. Reassembly. Use new washers at reassembly
atomized spray of fuel into each cylinder at the exact
and assemble in the reverse of disassembly (para
instant necessary for the engine power strokes.
e. Testing.
7-6. Fuel Injection Nozzles.
a. Removal.
Remove the fuel injection nozzles
CAUTION
The fuel injection nozzles and holder
b. Disassembly. Use a twelve point, %-inch box
assemblies must be handled with
wrench and remove the fuel nozzle retaining nut from
care at all times. The nozzle and
the holder assembly. Carefully remove the fuel nozzle
holder assemblies should be tested
and washer from the nozzle holder.
and adjusted only by fuel system
technicians using proper testing
NOTE
equipment.
(1) Use a static fuel nozzle testing fixture to
The
fuel
nozzles
and
holder
check nozzle operating pressure. The
assemblies must be handled with
nominal opening pressure should be 2750
care at all times. Use only authorized
psi.
To adjust the opening pressure,
repair tools and test equipment.
remove the cap nut and turn the adjusting
c. Cleaning, Inspection, and Repair.
screw clockwise to increase spring tension
or counterclockwise to decrease. This
(1) Clean the fuel injection nozzles in clean
adjustment raises or lowers opening
diesel fuel. Dry thoroughly with filtered,
pressure.
dry compressed air.
(2) New fuel injection nozzle and holder
(2) Inspect
the
fuel
nozzles,
holder
assemblies are shipped from the factory
assemblies, and retaining nuts for cracks,
set at 2900 psi to compensate for the
breaks, damaged threads, or any other
setting of the spring in the first few hours
defect.
of operation.
f. Installation.
Install the fuel injection nozzles
7-15
