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