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 150 of 1563

TM 9-2815-220-24

FUEL SYSTEM ABNORMAL CONDITIONS

0020 00

MALFUNCTION 6:

(Continued)

Fuel injection pump deficiencies.

PROBABLE CAUSE

CORRECTIVE ACTION

g. (Continued)

Fuel control stuck in "no-fuel"

position (result of improper preservative oil

during long term storage).

(6) If engine fails to start, replace fuel injection

pump (WP 0115, Fuel Injection Pump

Assembly Replacement).

h. Fuel injection pump drive coupling failure

(pump not rotating).

(1) Check fuel injection pump rotation as

follows:

PROCEDURE

OBSERVATION

ANALYSIS

Remove top deck, engine rear

cooling fan vane and rear fan.

Fuel injection pump shaft is

rotating.

Drive coupling is

satisfactory.

Crank engine.

Fuel injection pump shaft

and/or coupling do not rotate.

Fuel injection pump

coupling failed or is loose

on pump shaft.

PROBABLE CAUSE

CORRECTIVE ACTION

h. (Continued)

Fuel injection pump, drive

coupling failure (pump not rotating).

(2) Replace fuel injection pump drive coupling

(WP 0116, Coupling, Fuel Injection Pump

Replace/Repair.

i.

Fuel injection pump timing improper.

(1) Check timing (WP 0036, Injection Pump

Timing).

j.

Fuel injection pump internal failure.

(1) Replace fuel injection pump (WP 0115,

Fuel Injection Pump Assembly

Replacement).

MALFUNCTION 7:

Engine fuel supply pump defective.

PROBABLE CAUSE

CORRECTIVE ACTION

a. Fuel pump failure (insufficient fuel output

due to defective regulating valve, internal

pump wear or shaft seal leak causing fuel

leakage into engine oil).

(1) Check fuel pressure as follows:

WP 0020 00-8