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 121 of 1563
TM 9-2815-220-24
ENGINE ROUGH OPERATION
0014 00
MALFUNCTION 1:
(Continued)
Engine misfires (more noticeable at idle operation).
PROBABLE CAUSE
CORRECTIVE ACTION
g. Return fuel line disconnected or restricted.
(1) Inspect fuel line (WP 0088, Manifold
Heater Assembly and Related Parts
Replacement).
h. Manifold heater solenoid defective.
(1) Check solenoid operation as follows:
PROCEDURE
OBSERVATION
ANALYSIS
Evidence of action indicates
normal solenoid valve
operation.
Press heater switch
intermittently "ON" and
"OFF".
Note audible "click" or opening
and closing valve action (by
touch) of both solenoid valves
(fuel supply and fuel return).
No audible "click" or action
indicates solenoid valve(s) is
defective.
Fuel flow indicates solenoid
valve is operating properly and
fuel filters are satisfactory.
With switch in "ON" position,
note fuel flow from tee opening
with each purge pump stroke.
No fuel or restricted flow
indicates manifold heater filter
or felt filters in solenoid valve
are restricted or clogged.
If fuel flow stops, solenoid
valve is closing properly.
To Check Solenoid
Valve and Fuel Filter:
Disconnect one fuel tube
from engine front
solenoid valve outlet tee,
operate purge pump and
press heater switch "ON"
and "OFF".
With switch in "OFF" position
note that fuel flow stops.
If fuel flow continues, solenoid
valve is defective (stuck open).
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 felt filters in solenoid
valve are restricted or clogged.
If fuel flow stops, solenoid
valve is closing properly.
To Check 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 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).
WP 0014 00-3
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