TM-9-2815-220-24 Maintenance Manual for AVDS-1790-2CA AVDS-1790-DA and AVDS-1790-2DR Engines Download
Page 40 of 1563
TM 9-2815-220-24 EQUIPMENT DESCRIPTION AND DATA 0002 00 WP 0002 00-2 ENGINE CHARACTERISTICS, CAPABILITIES, AND FEATURES (Continued) • Lubrication of engines by forced feed system consisting of four circuits − Scavenge, main or pressure oil, leveling, make up − Circuits are operated independently by one oil pump with four separate sections • Two intake manifold heaters − Installed in air intake systems between intake manifold elbows and turbosuperchargers − Preheats air entering cylinders to facilitate cold-weather starting and cold-weather idle operation • Crankcase vented by enclosed crankcase breather system − Vented through crankcase breather tube at left of turbosupercharger exhaust pipe • Fuel filters have top-mounted bleeder valves to remove air from fuel system − Primary and fuel/water separator type secondary fuel filters • Water in fuel filters is removed − Primary fuel filter: Water is removed by a constant bleed orifice − Fuel/water separator type secondary fuel filter: Water is removed by an automatic water drain Models Distinguishing Features 2CA • • • • Clean Air Package Oil-cooled 28-volt dc, 650 ampere generator − Produces alternating current rectified within the unit to give direct current to output terminals 2DA Clean Air Package Air-cooled, 28-volt dc, 300 ampere generator − Blower motor mounted on generator draws cooling air from crew compartment through air intake tube which extends along crankcase below intake manifold on right side of engine − Generator air exhaust tube elbow is connected to rear of engine shroud − Outlet air is exhausted through engine rear cooling fan vane