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 167 of 1563

TM 9-2815-220-24

INTAKE MANIFOLD HEATER ABNORMAL OPERATION

0023 00

MALFUNCTION 1:

(Continued)

Manifold heater inoperative.

PROCEDURE

OBSERVATION

ANALYSIS

Solenoid Valve and Fuel

Filter: Disconnect one fuel

tube from engine front

solenoid valve outlet,

operate purge pump and

press manifold heater

switch "ON" and "OFF".

With switch in "ON" position,

note fuel flow from tee opening

with each purge pump stroke.

Fuel flow indicates solenoid

valve is operating properly

and fuel filters are

satisfactory.

No fuel or restricted flow

indicates manifold heater

filter or filters in solenoid

valve are restricted or

clogged.

See appropriate

vehicle technical manual.

If fuel flow stops, solenoid

valve is closing properly.

With switch in "OFF" position

note that fuel flow stops.

If fuel flow continues,

solenoid valve is defective

(stuck open).

Replace

solenoid.

Fine fuel spray pattern

indicates proper nozzle

operation.

Fuel Nozzle Assembly:

Disconnect lines and

remove nozzle assembly.

Reconnect lines to nozzle,

(position nozzle beside

housing) and operate

manifold heater system.

With switch in "ON" position,

nozzle should have fine conical

fuel spray pattern.

No spray pattern, stream of

fuel, dribble or no fuel

indicates defective nozzle or

plugged port filters in nozzle

assembly.

See appropriate

vehicle technical manual.

WP 0023 00-5