TM-9-2815-220-24
AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL FOR AVDS-1790 2CA, 2DA and 2DR Air-Cooled 12-Cylinder Diesel Engines
TM-9-2815-220-24 - Page 152 of 1563
TM 9-2815-220-24
FUEL SYSTEM ABNORMAL CONDITIONS
0020 00
MALFUNCTION 8:
(Continued)
Fuel injector nozzle defective.
PROCEDURE
OBSERVATION
ANALYSIS
High Pressure Fuel Check
•
Keep hands away from nozzle during test.
Remove one engine cover on each side of engine for access to fuel injector nozzle tube fittings
(WP 0072, Engine and Transmission Oil Cooler Access Covers and Frames Replacement).
Crank engine with fuel switch
"ON" or start engine and
operate at idle speed.
High-pressure fuel spray
pulsations at nozzle fitting.
Fuel injection pump action
is normal.
Loosen fuel injector tube fitting
at nozzle end sufficiently to
allow fuel leakage (one nozzle
on each side of the engine).
NOTE
Leave fitting loosened
only long enough to
verify fuel is flowing.
No fuel spray pulsations noted
at nozzle fitting.
Fuel injection pump
deficiency.
NOTE
Test all fuel injector
nozzles for proper
operation after a fuel
injection pump failure.
Bench Test
Install nozzle and holder
assembly on tester.
Perform nozzle test (WP 0098,
Fuel Injector Tubes, Brackets,
and Associated Parts
Replacement).
Spray pattern and nozzle
leakage test requirements.
If spray pattern is not
acceptable or leakage is
noted, nozzle is defective.
Nozzle Loose in Cylinder
Operate engine at idle speed.
Note any movement (jumping)
of nozzle in cylinder head
(visually or by touch).
Movement indicates loose
nozzle cap nut in body, or
collapsed nozzle holder
spring.
Nozzle is defective.
PROBABLE CAUSE
CORRECTIVE ACTION
a. (Continued)
Abnormal spray pattern (sticky
action, stuck partially open, or orifices
partially plugged).
(2) Repair or replace defective nozzle assembly
(WP 0114, Fuel Injector Nozzle
Replace/Repair).
WP 0020 00-10
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