TM 9-2350-256-20-1
0003 00
Engine
The Continental model AVDS-1790-2DR engine is a 12-cylinder, 90-degree, V-type, 4-cycle, air-cooled, turbosupercharged,
diesel engine. The cylinder assemblies are individually replaceable units with overhead valves and valve rocker assemblies
in the head. The cylinders are arranged in two banks of six cylinders each. Each bank of cylinders has an overhead camshaft
arrangement to actuate the valves of each cylinder.
The engine features a fuel injection system and a turbosupercharged, air induction system. The fuel injection system utilizes a
fuel injection metering pump which supplies metered fuel to individual cylinders through fuel injector nozzles. The fuel pump
assembly (22), located at the front of the engine, delivers fuel to the injector pump. A turbosupercharger (7 and 29) is located on
each side of the engine at the rear. The turbosuperchargers are exhaust-gas driven and increase the airflow pressure entering the
air intake manifolds. The engine is equipped with a 28-V, 300-A, dc generator (9) and a 24-V, solenoid-operated starter (34).
The engine is lubricated by a forced-feed system. The system consists of three circuits: the scavenge circuit, the main or pressure
oil circuit, and the piston cooling circuit. These circuits are operated independently by one oil pump, which consists of four
separate pump sections.
The engine is equipped with two intake manifold heaters (15 and 33) which are installed in the air intake system between the
intake manifold elbows and the turbosuperchargers (7 and 29). The heaters, when operated, preheat the air entering the cylinders
to facilitate cold-weather starting and cold-weather idle operation.
The engine crankcase is vented by the crankcase breather system which exhausts through the crankcase breather tube at the left
turbosupercharger exhaust outlet.
The engine primary fuel filter (2) and fuel/water separator-type secondary fuel filter (26) both have top-mounted bleeder valves
to assist in the removal of air from the fuel system. Water is removed automatically by a constant-bleed orifice in the primary
fuel filter and an automatic water drain in the fuel/water separator fuel filter.
Figure 2.
Engine (1 of 4).
0003 00-2
