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 140 of 1563
TM 9-2815-220-24
ENGINE PERFORMANCE LOW
0019 00
WP 0019 00-2
POWER VERIFICATION: Perform engine "stall" test as follows:
(Continued)
PROCEDURE
OBSERVATION
ANALYSIS
Engine speed 1800-1950 rpm.
Engine power is
normal.
Engine speed below 1800 rpm.
Power is below normal.
Repeat the preceding
step, but operate
engine for 30 seconds.
Engine speed above 1950 rpm.
Transmission is
slipping or fuel
injection pump is out of
adjustment.
PROBABLE CAUSE
CORRECTIVE ACTION
(1) Investigate transmission clutches, brakes,
and vehicle suspension for being too tight.
Repair as required (refer to pertinent vehicle
technical manual).
a.
If stall speed is normal (1800-1950 rpm),
low performance is vehicle related or
vehicle may be operating under severe
conditions.
(2) Check vehicle performance on hard road;
and if performance is satisfactory, limit
vehicle operation under severe conditions to
short periods of operation.
Possible engine
damage may be prevented.
(1) Investigate for transmission slippage (refer
to vehicle technical manual).
b.
If stall speed is above normal (more than
1950 rpm) low performance is transmission
related and engine is over-powered.
(2) Replace fuel injection pump (WP 0115,
Fuel Injection Pump Assembly
Replacement).
MALFUNCTION 1:
Low stall with both banks firing and normal smoke.
PROBABLE CAUSE
CORRECTIVE ACTION
a.
In-tank fuel pump inoperative.
(1) Check in-tank fuel pump operation (refer to
pertinent vehicle manual).
Repair as
required.
b.
Throttle travel limited.
(1) Inspect accelerator and throttle linkages
(WP 0122, Throttle Control and Manual
Fuel Shutoff Replace/Repair).
(WP 0123
for 2DR)
c.
Water contaminated fuel or improper fuel.
(1) Check fuel system for water content
(WP 0020, Fuel System Abnormal
Conditions).
Service as required (refer to
pertinent vehicle technical manual for
proper fuel specification).
d.
Fuel filter restriction (dirty).
(1) Inspect fuel filters (refer to pertinent vehicle
technical manual).
Service filters as
required.
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