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