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 106 of 1563
TM 9-2815-220-24
ENGINE FAILS TO START AT NORMAL CRANKING SPEED
0008 00
MALFUNCTION 1:
(Continued)
Cylinders not firing (insufficient fuel or incomplete combustion).
PROCEDURE
OBSERVATION
ANALYSIS
If fuel flow stops, solenoid
valve is closing properly.
(Continued) Solenoid
Valve and Fuel Filter
With switch in "OFF" position note
that fuel flow stops.
If fuel flow continues, solenoid
valve is defective (stuck open).
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
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 felt port filters in
nozzle assembly.
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.
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).
PROBABLE CAUSE
CORRECTIVE ACTION
d. Low cylinder compression.
(1) Check cylinder compression (WP 0033,
Cylinder Compression Test).
e. Throttle linkage disconnected.
(1) Check linkage (WP 0122, Injection Pump
Throttle Linkage and Associated Parts
Repair).
(WP 0123 for 2DR)
f.
Injection pump or drive deficiency.
(1) Check for deficiencies (WP 0020, Fuel
System Abnormal Conditions,
Malfunction 6).
WP 0008 00-4
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