TM 9-2350-256-20-1
UNIT MAINTENANCE
RECOVERY VEHICLE, FULL TRACKED: MEDIUM, M88A1
NSN 2350-00-122-6826, EIC AQA
EXHAUST SMOKE GENERATING SYSTEM THEORY OF OPERATION
Exhaust Smoke Generating System
The exhaust smoke generating system consists of solenoid valves, switch assemblies, shutoff valve, indicator light, mounting
brackets, fuel hose assemblies, electrical leads, and attaching parts.
The solenoid valves and fuel tube assemblies are attached to the rear of the engine. Fuel to operate the smoke generating system
is taken from the main fuel supply at the front of the engine.
The switch (1) to operate the smoke generating system is installed in the driver's compartment and the commander's station, and
is connected to the main wiring harness using electrical leads provided in the smoke generating system kits.
The smoke generating system uses the engine fuel pump to supply diesel fuel, from the vehicle fuel tanks, to two solenoid valves
mounted at the rear of the engine. When the solenoid valves are energized (opened), they allow diesel fuel to be sprayed into
the exhaust system. The fuel vaporizes and exits together with the engine exhaust gases. The fuel vapor cools on contact with
the moving exhaust air and condenses to form a dense smoke screen. The electrical power to energize the solenoid valves is
supplied by the warning indicator and warning horn systems. The warning horn will not sound unless the engine is running, and
connection to this system prevents accidental activation of the smoke generating system when the engine is not running.
The manual fuel shutoff valve can be used to determine if the smoke produced is from a malfunctioning engine, or from the
smoke generating system.
Figure 1. Exhaust Smoke Generating System.
END OF WORK PACKAGE
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