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 105 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
Solenoid Valve(s) Operation
NOTE
Disconnect purge pump fuel hose quick-disconnect coupling at engine
before performing test.
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 System Checks
Moderate flow with each
stroke indicates normal purge
pump operation.
Purge Pump:
Disconnect purge
pump fuel hose quick
disconnect coupling at
engine main fuel
backflow valve.
Hold
coupling valve open
and operate purge
pump.
Note fuel with each firm stroke of
purge pump.
If flow is not evident, purge
pump is defective, or purge
lines are blocked or leaking.
Moderate flow with each
stroke indicates no in-line filter
restriction.
Filter satisfactory.
Fuel Filter:
Disconnect fuel tube
between fuel check
valve tee and manifold
heater fuel filter and
operate purge pump.
Note fuel flow with each stroke of
purge pump.
No flow, or restricted flow,
indicates in-line filter is
plugged.
Fuel flow indicates solenoid
valve is operating properly and
fuel filters are satisfactory.
Solenoid Valve and
Fuel Filter:
Disconnect one fuel
tube from engine front
solenoid valve outlet
tree, operate purge
pump and press heater
switch "ON" and
"OFF".
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.
WP 0008 00-3
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