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 147 of 1563

TM 9-2815-220-24
FUEL SYSTEM ABNORMAL CONDITIONS
0020 00
MALFUNCTION 6:
Fuel injection pump deficiencies.
PROBABLE CAUSE
CORRECTIVE ACTION
(1) Adjust low-idle stop screw on fuel injection
pump.
NOTE
Required only when engine speed
cannot be adjusted as described in WP
0040, Engine Operating Parameters.
a. Fuel injection pump governor low-idle
speed adjustment improper.
(2) If low idle speed cannot be obtained,
replace fuel injection pump (WP 0115, Fuel
Injection Pump Assembly Replacement).
b. Fuel injection pump governor high-idle
speed improper.
(1) Check high-idle speed as follows:
PROCEDURE
OBSERVATION
ANALYSIS
High Idle Test
NOTE
Use a calibrated tachometer
for this test.
Start engine and warm-up to
normal operating temperature
(140
°
F).
Engine speed
2500-2640 rpm.
Speed is normal and governor
no-load adjustment is proper.
Engine speed below
2500 rpm.
Speed too low.
With transmission in "neutral",
depress accelerator pedal fully for
approximately 10 seconds.
Engine speed exceeds
2640 rpm.
Speed too high.
PROBABLE CAUSE
CORRECTIVE ACTION
(2) Check linkages and adjustment (WP 0043)
then repeat High Idle Test (above).
b. (Continued)
Fuel injection pump governor
high-idle speed improper.
(3) Replace fuel injection pump (WP 0115,
Fuel Injection Pump Assembly
Replacement).
c. Fuel-metering governor mechanism
binding, loose, worn or broken.
(1) Replace fuel injection pump (WP 0115,
Fuel Injection Pump Assembly
Replacement).
WP 0020 00-5


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