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 99 of 1563

TM 9-2815-220-24
ENGINE FAILS TO CRANK
0006 00
MALFUNCTION 2:
Starter engages but engine does not crank (audible solenoid action or starter gear engagement).
PROBABLE CAUSE
CORRECTIVE ACTION
a. Starter engagement assembly damaged.
(1) Remove starter and inspect assembly.
Repair or replace starter (WP 0049, Starter
Motor Replacement).
b. Starter drive gear damaged.
(1) With starter removed, inspect engine starter
driven gear (WP 0157, Starter Drive
Mechanism Repair).
c. Starter failure.
(1) Replace starter assembly (WP 0049, Starter
Motor Replacement).
d. Engine hydrostatic lock.
(1) Investigate as follows:
PROCEDURE
OBSERVATION
ANALYSIS
With Master switch
"ON," hold fuel shut-
off (engine "stop")
switch in the off
position.
Audibly note normal starter
engagement action.
Starter energized and
engagement proper.
Press starter switch
momentarily (about
3 seconds).
Engine does not crank.
Fluid in cylinder chamber
causing hydrostatic lock.
Hydrostatic damage to engine
may exist.
PROBABLE CAUSE
CORRECTIVE ACTION
(2) Remove shroud and access covers for
access to injector nozzles (WP 0090, Engine
and Transmission Oil Cooler Access Covers
and Frames Replacement, and WP 0055,
Top Shroud and Mounting Brackets
Replacement).
(3) Remove all fuel injector nozzles (WP 0114,
Fuel Injector Nozzles and Holder Repair).
d. (Continued) Engine hydrostatic lock.
(4) Clear intake manifolds as follows:
PROCEDURE
OBSERVATION
ANALYSIS
If knock occurs, cease cranking.
Connecting rod or piston
damage exists.
Hold fuel shut-off
(engine "stop") switch,
and crank engine
several revolutions
(5-10 seconds).
Note fluid blown from cylinders.
Combustion chamber clear.
WP 0006 00-3


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