Quantcast MALFUNCTION 8: Fuel injector nozzle defective-continued

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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.
Loosen fuel injector tube fitting  High-pressure fuel spray
Fuel injection pump action
at nozzle end sufficiently to
pulsations at nozzle fitting.
is normal.
allow fuel leakage (one nozzle
No fuel spray pulsations noted  Fuel injection pump
on each side of the engine).
at nozzle fitting.
deficiency.
NOTE
NOTE
Test all fuel injector
Leave fitting loosened
nozzles for proper
only long enough to
operation after a fuel
verify fuel is flowing.
injection pump failure.
Bench Test
Install nozzle and holder
assembly on tester.
Spray pattern and nozzle
If spray pattern is not
Perform nozzle test (WP 0098,
leakage test requirements.
acceptable or leakage is
Fuel Injector Tubes, Brackets,
noted, nozzle is defective.
and Associated Parts
Replacement).
Nozzle Loose in Cylinder
Movement indicates loose
Operate engine at idle speed.
Note any movement (jumping)
nozzle cap nut in body, or
of nozzle in cylinder head
collapsed nozzle holder
(visually or by touch).
spring. Nozzle is defective.
PROBABLE CAUSE
CORRECTIVE ACTION
a. (Continued) Abnormal spray pattern (sticky (2) Repair or replace defective nozzle assembly
(WP 0114, Fuel Injector Nozzle
action, stuck partially open, or orifices
Replace/Repair).
partially plugged).
WP 0020 00-10

 


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