TM 9-2330-356-14
Remove Number 2, Number 3, and Number 4
d.
(i) Check injection port closing point by
repeating steps (c) through (f). The timing pointer should
cylinder injection nozzles and holder assemblies from
indicate the PC mark on flywheel. In no case should
engine, and reconnect fuel inlet and return lines. Use
pointer be more than mark away from the P.C. mark.
additional lines and fittings of same gage and material as
required to direct nozzle away from engine.
(j) Install delivery valve components. Be
sure all parts are clean, and assembled carefully and prop-
WARNING
erly. The delivery valve holder must be assembled with a
twelve-point wrench, and retightened to 70-80 lb.-ft. The
Do not allow nozzle spray to contact skin.
cap nut must be retightened to 55-60 lb.-ft.
Diesel fuel under pressure can penetrate
Nozzle Assembly Test and Adjustment
flesh and cause serious injury and infection.
The nozzle and holder assemblies are designed to open at
e.
Crank engine and observe pressure gage at
1900-1950 psi. However, after several hundred hours of
moment fuel is ejected from nozzle. The pressure gage
operation, the nozzle pressure will decrease to an
should read at least 1750 psi opening pressure.
acceptable 1750 psi. To test and adjust the nozzle
assemblies, it will be necessary to use a nozzle pressure
To adjust opening pressure, remove set-screw and
f.
tester or pressure gage that reads at least 2000 psi. The
back off adjusting nut cover several turns. Insert allen
following steps describe test procedures using a pressure
wrench through adjusting nut cover and into adjusting
gage.
nut. Turn adjusting nut clockwise to increase pressure and
counterclockwise to decrease pressure. Some chattering
a.
Remove Number 1 cylinder nozzle and holder
of the nozzle is normal during pressure test.
assembly from the engine.
Disconnect fuel inlet line at nozzle and holder
b.
NOTE
assembly. Attach nozzle inlet line from fuel injection
If streamers of fuel are visible or the nozzle
pump to inlet end of pressure gage.
drips before It reaches opening pressure of
c. Attach a flexible line to outlet end of pressure
1750 psi minimum, the nozzle is either dirty or
gage and to inlet end of nozzle. Be certain nozzle-to-fuel
defective. If dirty, clean nozzle and valve. If
injection return line is attached.
defective, replace nozzle and valve together.
After adjusting nozzle opening pressure,
CAUTION
g.
continue to crank the engine and observe the nozzle spray
During nozzle test procedures, all nozzles
pattern. A good spray pattern (fig. 7-79) will be cone
must be removed from the engine. Failure to
shaped with a solid appearing center surrounded by
do so may result In damage to the engine.
cloud-like fog, with the spray evenly atomized.
