TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download
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TM 9-2815-220-34 cl. i� :: 1tgine Oil Temvernture IVarning Light Switch. The oil temperature warning light switch is located in lhe oil passage above the oil pressure waing light switch in the right side of the crankshaft damper and oil filter housing. The warni ng light sending switch thermostatically controlled electrical contact points close when oil temperature in the engine main oil passage reaches 245 ± 5°. Completion of the electrical circuit will light the oil high temperature waing lamp on the vehicle instrument panel. e. Auxiliary Generator lligll Oil Pressure Sending Switch (Model AVDS- J790- 2DR only, fig. 1-7.1). The auxiliary generator high oil pressure sending switch is located at the right front of the crankcase in the tee that mounts the oil pressure gage transmitter. This switch prevents simultaneous operation of the main engine and auxiliary genera- ting systems. 1·22 Change 3 1·21.1 Smoke Generating System 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 re'ar of the engine (fig. 1- 14.1 ). When the solenoid valves are energized (opened) they allow diesel fuel to be sprayed into the engine exhaust system. The fuel vaporizes and exits together with the engine exhaust gases. The fuel vapor cools on contact with the ambient air and condenses to form a dense ho- mogeneous smoke screen. The electrical power lo energize the solenoid valves is supplied by the vehicle air cleaner blower motor circuit on Model A V D S -17 90-2C, A V D S-1 7 90-2CA, I AVDS- 1790-20, and AVDS-1790- 2DA engines, and the waing indicator and waing ho circuit on Model AVDS - l 790-2DR engines. Tltis prevents accidental activatJon of the smoke generating system when the engine is not running.