distances from one location to another by two men. It can be transported by any suitable wheeled
Location and Description of Major components
Figure 2 gives the location of the major components of the M3A4 smoke generator. A description
of the components follows. (Letters refer to Figure 2.)
The engine assembly (A) is a gasoline-operated, pulse jet engine with an outer shell and front
cover. It heats fog oil into vapor and releases it into the air where it cools and forms a smoke cloud.
The adjustable float assembly (B) regulates fuel flow to the engine head assembly.
The engine head assembly (C) injects fuel air mixture into the combustion chamber of the engine
The air pump assembly (D) is a hand-operated pump that pressurizes the air accumulator assembly
to provide air to start the engine.
The magneto air pump assembly (E) is a magneto and hand-operated pump that provides a spark to
start the engine and air to purge hot gases from the engine.
The M4 fog oil pump assembly (F) consists of an air motor and oil pump operated by engine
The fuel tank assembly (G) is a steel 3 1/2-gallon tank with fuel gage assembly and cap.
The toolbox assembly (H) is an aluminum box with a hasp and hinged cover. It is used to store on-
board spares and tools.
The frame assembly (I) consists of a welded tubular steel frame and four sliding handles. It serves
as a mount for all major components of the M3A4 smoke generator.
The handles (J) are sliding steel tubes on the frame assembly. Handles are extended to carry the
smoke generator and retracted when not in use.
The fog oil inlet hose (K) is a rubber hose assembly with a fog oil strainer at the loose end. The
other end is clamped to the M4 fog oil pump.
The loose end is inserted in the fog oil drum to supply fog oil to the engine through the fog oil
The fog oil exhaust hose (L) is a rubber hose used to return excess fog oil to the supply drum. One
end is clamped to the M4 fog oil pump. The loose end is inserted in the fog oil drum.