Operation0810−1/A1
Winterthur Gas & Diesel Ltd.
2/ 4
Problem Possible Cause Procedure
Engine will not start from the
control stand at the engine
(continued).
The starting air shut-off valve does not open,
(cannot move), the non-return valve cannot
move and does not fully open.
Do an overhaul of the starting
air shut-off valve.
The auxiliary blowers do not operate. Start the auxiliary blowers.
The air flaps in the scavenge air receiver are
defective (no pressure from the auxiliary
blowers).
Do an overhaul on, or replace
the air flaps.
No air spring pressure, or pressure is too low. Open the shut-off cock 4.08,
adjust the pressure to 6 bar in
the control air supply unit A.
The non-return valve on the exhaust valve (air
inlet to air spring) is incorrectly installed. You
can hear loud noises and the exhaust valve
does not fully close.
Do a check and install
correctly (see the
Maintenance Manual 2751−2)
The starting valves cannot move or the
electrical connection is not connected
Do an overhaul of the starting
valves or connect the
electrical connection
Different causes Try to start the engine in the
opposite direction
The engine moves back
during the start sequence, or
does not get to the
applicable speed.
A cylinder receives no starting air, or the
starting air is not sufficient (blockage in
starting air pipe). The solenoid valve(s)
ZV7241 (to ZV7248C) cannot move. The cable
to the FCM−20 is broken.
Do a check of the starting air
pipe, flame arrestor and
remove the blockage. Clean
or replace the related
solenoid valve(s), do a check
of the electrical signal.
The starting air pressure is too low. Fill the air bottles.
The stop valve 4.37 is closed. Open the stop valve 4.37.
The engine turns on starting
air but receives no fuel. Fuel
quantity piston stays in
position zero %.
The speed control system is defective. No fuel
quantity signal released to the fuel quantity
sensor.
See documentation of remote
control supplier. Do a check
of the electrical signal from
the speed control system to
the WECS−9520.
The engine turns on starting
air but gets no fuel.
Fuel rail pressure is too low. The connection
between the actuators and the toothed rack is
disconnected.
Install the connecting
elements (see the
Maintenance Manual
5801−1).
The fuel rail pressure is too low. The toothed
rack is blocked in the position zero.
Do a check of the toothed
rack. Repair the damage.
The fuel rail pressure too low. The knurled
screw on the fuel pressure control valve 3.06
is open.
Do a check of the fuel
pressure control valve 3.06
(see 0515−1).
The piston or control slide in the injection
control unit 3.02 cannot move. The piston in
the rail valve ZV7201 cannot move.
Replace the injection control
unit, or the rail valve (see
0515−1).
Heavy leakage in the high pressure fuel
system on the engine.
Do a check for leaks, see
8019−1 Fuel leakage system.
2014
Problems during Engine Start and Stop
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