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 128 of 1563
TM 9-2815-220-24
ENGINE ABNORMAL EXHAUST
0016 00
MALFUNCTION 1:
(Continued)
Excessive black smoke (one or both banks).
PROCEDURE
OBSERVATION
ANALYSIS
Engine speed 1800-1950 rpm.
Engine power is
normal.
Engine speed below 1800 rpm.
Power is below normal.
Air Cleaners
(Continued)
Repeat the preceding
step, but operate
engine for 30 seconds
(maximum).
Engine speed above 1950 rpm.
Transmission is
slipping or fuel
injection pump is out of
adjustment.
Normal engine speed (1800-1950 rpm).
Air cleaner elements
satisfactory.
Speed below normal.
Proceed to next step.
Open doors, remove
elements, clean
element chamber and
close doors.
Repeat
stall test.
If engine speed increases from speed
obtained previously to normal speed.
The elements are dirty.
PROBABLE CAUSE
CORRECTIVE ACTION
b. (Continued)
Air cleaner restriction
(element dirty, wet or blower motor
inoperative).
(2) Service filter (clean, dry or replace).
Refer
to pertinent vehicle technical manual.
c. Air cleaner hose collapsed.
(1) Inspect, repair or replace (refer to pertinent
vehicle technical manual).
d. Turbocharger air inlet blocked with plastic
plug, tape, rag, or other debris (usually one
bank only).
(1) Inspect and clean (refer to pertinent vehicle
technical manual).
e. Turbocharger compressor housing clamp.
(1) Tighten or replace clamp.
f.
Turbocharger defective (sticky, worn or
failed bearings, seals and damaged
impeller).
(1) Remove inlet elbows (refer to pertinent
vehicle technical manual) and check for
bearing play or looseness, impeller damage,
or excessive carbon deposits on turbine
wheel.
Replace defective turbocharger
(WP 009, Turbocharger Assembly
Replacement (2CA & 2DA) or WP 0100 for
2DR).
g. Exhaust manifold leak (loose flange, failed
gasket, cracked or damaged manifold or
elbow).
(1) Inspect exhaust manifold for leaks and
repair as required (WP 0107, Exhaust
Manifolds and Associated Parts
Replacement).
WP 0016 00-2
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