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 168 of 1563

TM 9-2815-220-24

INTAKE MANIFOLD HEATER ABNORMAL OPERATION

0023 00

MALFUNCTION 1:

(Continued)

Manifold heater inoperative.

PROCEDURE

OBSERVATION

ANALYSIS

Moderate flow indicates

solenoid valve is operating

properly and check valve is

opening properly.

With switch in "ON" position,

note fuel flow from check valve

opening.

No fuel or restricted flow

indicates check valve stuck

closed or filters in solenoid

valve are restricted or

clogged.

See appropriate

vehicle technical manual.

If fuel flow stops, solenoid

valve is closing properly.

Return Fuel Solenoid Valve

and Check Valve: Remove

fuel return solenoid outlet

tube after the check valve at

rear of engine, operate

purge pump and press

manifold heater switch

"ON" and "OFF".

With switch in "OFF" position

note that fuel flow stops.

If fuel flow continues,

solenoid valve is defective

(stuck in open position).

Replace solenoid.

PROBABLE CAUSE

CORRECTIVE ACTION

Fuel backflow valve

Perform pressure tests in work package

END OF WORK PACKAGE

WP 0023 00-6