Figure 1-2. M1059 and M157/M998 Smoke Generator Systems
The engine consists of a nozzle assembly, an engine head assembly, a nozzle clamp assembly, an engine
tube, an ignitor, and a sensing element assembly.
(1) Nozzle assembly. The nozzle assembly (Figure 1-3) consists of a nozzle (1), a
support assembly (2), a fuel nozzle (3), and an air nozzle (4). The nozzle assembly is a cone-shaped
device through which fuel-air mixtures are introduced into the engine head and through it into the
(2) Engine head assembly. The engine head assembly (Figure 1-4) consists of an engine
head (1), an engine valve (2), an engine valve backstop (3), a backstop washer (4), a lock washer (5),
and a machine bolt (6). The engine head assembly is accessible after removal of the nozzle clamp and
nozzle assembly. The engine head is missing one cooling fin to allow attachment of the nozzle clamp.
The engine valve is circular and has 16 petals. During operation fuel-air mixtures are sucked through
the engine valve into the combustion chamber where they explode.
(3) Nozzle clamp assembly. The nozzle clamp assembly (Figure 1-5) consists of a clamp
(1), a clamp nut (2), and a lifting catch (3). The lifting catch fits over the tab on the clamp nut.
Tightening the clamp nut collapses the clamp around the nozzle and engine head and secures them to