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 104 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
24 volts at heater switch, both
connectors.
Proper voltage through heater
switch.
No voltage to switch.
Defective circuit.
No voltage from switch.
Defective switch.
24 volts at engine bulk head
connector.
Proper voltage.
No voltage to bulkhead connector.
Defective circuit between
switch and connector.
24 volts at solenoid valve(s) supply
and return wire connector.
Proper voltage supply to
solenoid valves.
No voltage at solenoid valves.
Defective circuit between
connector and valves.
24 volts at ignition unit connector.
Proper voltage to ignition unit.
(Heater Voltage
Checks, Continued)
Check electrical circuit
voltages (master switch
and heater switch
"ON").
No voltage at ignition unit.
Defective circuit to ignition
unit.
Ignition Unit Operational Check
NOTE
Disconnect purge pump fuel hose
quick-disconnect coupling at engine
before performing test.
WARNING
High Voltage/High Amperage
(see decal on unit)
High-tension spark indicates
ignition unit operation normal.
Remove high-tension
wire from igniter (spark
plug).
Position lead
wire end to ground for
spark gap (1/4 inch).
Note high-tension spark (hot
bluish-white) across gap (lead-to-
ground).
Improper spark or no spark
indicates ignition unit or lead is
defective
Spark Plug Operational Check
NOTE
Disconnect purge pump fuel hose
quick-disconnect coupling at engine
before performing test.
WARNING
High Voltage.
High tension spark indicates
spark plug firing, operation
normal.
Remove spark plug,
reconnect wire to spark
plug, ground plug body
to engine and press
heater switch "ON".
Note high tension spark across
spark plug electrodes.
No spark indicates the spark
plug is defective.
WP 0008 00-2
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