The engine head assembly (Figure 3) consists of an engine head, a 16-petal engine valve, and a
flowjector. The engine head assembly is accessible after opening the front cover. The engine valve is
circular in shape and is equipped with 16 petals. It is held to the rear of the engine head by a backstop, a
backstop washer, and a machine bolt. The flowjector is a device through which fuel is introduced to the
mixing chamber in the engine head. It consists of an air tube and a body with three fuel spray orifices.
The fuelmetering jet, which is installed in the end of the flowjector, meters the flow of fuel from the
flexible tube.
Figure 3. Engine head assembly.
The engine tube is a trombone-shaped assembly that serves as a combustion chamber and exhaust
tube. The engine head is attached to the front end of the combustion chamber by the engine head
adapter. The engine tube conducts exhaust gases and vaporized fog oil to the space inside the engine
tube housing assembly. The engine tube housing assembly is flanged at each end for attaching the
engine tube and cooling baffle assemble at the engine head end, and for attaching the inner and outer
discharge-baffle assemblies at the smoke outlet end. The inner discharge baffle is a welded assembly
consisting of the baffle and two mufflers. The baffle assembly is welded to the flange on the engine
tube housing assembly. The outer discharge baffle consists of a domeshaped plate with three outlet
nozzles welded to it. The outer discharge baffle, a gasket, and a backup ring are bolted to the flange on
the engine tube housing. A discharge cover assembly is fastened to the smoke outlet end of the outer
shell. The front cover is mounted on the engine head section of the engine by a hinge. It can be opened
for access to the engine head, float bowl, fuel-metering valve, or to other components mounted on the
front of the engine. The cover is held partly open by a stop when the engine is being operated. It is
closed when the generator is being transported or is in storage.
Fuel System. A gravity-fed, float-controlled fuel system (Figure 4) is used to supply fuel to the pulse jet
engine. The fuel system consists of the fuel tank assembly and the float bowl assembly. The fuel tank
assembly consists of a fuel tank, a cap, a fuel drain cock, a fuel line shutoff valve, a fuel sediment
strainer, a fuel filter, and a fuel hose assembly. The float bowl assembly consists of the float bowl, float
assembly support rod, float adjuster support bracket, adjustment knob, float bowl toggle valve, fuel tube,
and hose clamps. Fuel flows by gravity from the fuel tank through the fuel line valve, fuel strainer, fuel
filter, and fuel line to the float bowl. The
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