4.7.4 Option la, lb
Options for operating in fire hazard areas
4.7.4.1 Option la
Spark arrestor
A spark arrestor on the exhaust silencer is required when operating a diesel engine in a fire hazard
area and in forestry and agricultural applications. In such applications, a spark may ignite flamma‐
ble materials.
The spark arrestor prevents the exhaust silencer emitting any glowing fuel residue.
4.7.4.2 Option lb
Engine air intake shut-off valve
Any flammable gas drawn into the diesel engine's air intake alters and enriches the controlled fuel/
air mixture fed to the engine. This causes a sudden and uncontrolled increase in engine speed that
can lead to serious mechanical damage. Without appropriate preventive measures, the engine and
compressor can be destroyed. Explosion or fire are also possible.
When flammable gas is drawn into the engine, shutting off the fuel supply will not stop the engine
right away. Only by shutting off the air intake can the engine be brought to an immediate stop.
The self-closing valve shuts off the engine air intake as soon as flammable gas is drawn in. This
brings the engine to an immediate stop.
Manual actuating the engine air shut-off valve:
The engine air intake shut-off valve may also be operated manually. Pulling a wire pull lever closes
the intake valve.
NOTICE
Thermal overload of the engine!
Damage to the turbo charger by abrupt engine shutdown after high loading.
➤ Use the wire pull handle only in an emergency when the surrounding air contains a flam‐
mable gas.
➤ Do not use the wire pull handle as the normal means of shutting down the machine.
Fig. 13 Pull handle of engine air shut-off valve
1 Handle
4 Design and Function
4.7 Options
42
Service manual Portable compressor
M122 No.: 9_6974 20 E
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