Quantcast MALFUNCTION 2: Low stall speed with black exhaust smoke: (one or both banks).

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TM 9-2815-220-24
ENGINE PERFORMANCE LOW
0019 00
MALFUNCTION 1: (Continued)
Low stall with both banks firing and normal smoke.
PROBABLE CAUSE
CORRECTIVE ACTION
e. Fuel return restriction.
(1)
Inspect fuel return (WP 0020, Fuel System
Abnormal Conditions). Repair as required.
f. Fuel supply leaks.
(1)
Inspect for leaks and repair.
g. Governor high-idle adjustment improper.
(1)
Check high-idle operation. If out of
specifications, replace fuel injection pump
(WP 0115, Fuel Injection Pump Assembly
Replacement).
h. Fuel injection pump fuel adjustment
(1)
Replace fuel injection pump (WP 0115,
improper.
Fuel Injection Pump Assembly
Replacement).
i. Engine fuel supply pump defective.
(1)
Check pump operation. (WP 0020, Fuel
System Abnormal Conditions). Repair or
replace as required.
j. Fuel injection pump fuel pressure regulating
(1)
Replace Fuel injection pump (WP 0115,
valve defective.
Fuel Injection Pump Assembly
Replacement).
k. Fuel injection pump timing improper.
(1)
Check timing (WP 0036, Injection Pump
Timing). Retime as required.
MALFUNCTION 2:
Low stall speed with black exhaust smoke: (one or both banks).
PROBABLE CAUSE
CORRECTIVE ACTION
a. Vehicle air cleaner inlets blocked with
(1) Inspect and clean.
debris.
b. Air cleaner restriction.
(1) Check air cleaner as follows:
PROCEDURE
OBSERVATION
ANALYSIS
Pre-cleaner Blower:
Note blast of air (on hand) from pre-  Blast of air indicates
Start engine and operate at
blower(s) is operating.
idle.
cleaner air exhaust outlets, two on
each air cleaner.
No air blast.
Blower(s) is inoperative.
Perform "stall" test as
Normal speed (1800-1950 rpm).
Air cleaner elements
outlined on page 1, this
satisfactory.
work package.
Speed below normal.
Proceed to next step.
CAUTION
Do not perform under
dusty conditions.
WP 0019 00-3

 


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