TM 10-4320-344-24
2.21.8 Fuel Injection Nozzle and Holder Assembly Maintenance, Model 609-A. (Continued)
a .
Tag each fuel injection nozzle and holder assembly (Figure 2-121, 1) to
identify its position in cylinder head (2).
b.
Remove twelve screws (3),
lock washers (4) six fuel injection nozzle and
holder assemblies (1), and gaskets (5) from cylinder head (2). Discard lock
washers (4) and gaskets (5).
2.21.8.2 Test.
• Diesel fuel is flammable.
Keep sparks, cigarettes, and open flame
away from fuel
system components while working on engine.
• To prevent the possibility of embedding foreign objects in the eyes,
safety glasses must be worn when using compressed air.
• Failure to obey these warnings may result in personal injury.
a .
Clean fuel injection nozzle and holder assembly (1) in clean diesel fuel and
dry thoroughly with filtered, compressed dry air.
b.
Insert fuel injection nozzle and holder assembly (1) in static fuel nozzle
t e s t i n g f i x t u r e .
• Nozzle opening pressure should be 2,750 psi (18,943 kPa).
New fuel
injection nozzle and holder assembly will have an opening pressure
of 2,900 psi (19,956 kPa).
• Turn adjusting screw in nozzle holder clockwise to increase pressure
required to open fuel injection nozzle and counterclockwise to
decrease pressure required to open fuel injection nozzle.
c .
To adjust fuel injection nozzle and holder assembly (1), remove cover
attaching nut (6) and turn screw in nozzle holder (1).
d.
Install cover attaching nut (6) on nozzle holder (1).
e .
If fuel injection nozzle fails to open at proper psi, replace fuel injection
nozzle and holder assembly (1).
2.21.8.3 Installation.
a.
Install six new gaskets (5) in cylinder head (2).
b.
Refer to tags and install six fuel injection nozzle and holder assemblies (1)
in their original position in cylinder head (2). Remove and discard tags.
c .
Install twelve new lock washers (4) and screws (3).
Torque screws (3) to 25-
30 ft-lbs (34-41 N•m).
NOTE
2-280
