TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download

TM 9-2815-220-34 Section XXIX. ENGINE TEST AND ADJUSTMENTS 3-190. Engine Specifications a. Speed Ra11ge. The engine must operate satis- factorily under all loads through a speed range of I 000 to 2400 rpm �111d must idle satisfactorily at 675 to 725 rpm. b. Cross llorsepower (Without Accessories). Under full throttle setting, engine will clcvelop 735 to 780 gross horsepower at 2400 rpm, using fuel conforming lo Specification VV-f'-800 (DF-2). c. Cross Torque (Without Accessories). Under full throttle setting, engine will develop the follow- ing gross lorq ue using fuel conforming to Specifica- tion VY-F-800 (OF-2). (I) 1770 to 1842 lb/ft@1800 rpm. (2) 1609 to 1707 lb/ft@2400 rpm. d. Oil Co11s11mptio11. Engine shall not consume more than 0.0075 pounds per brake horsepower hour (lbs/bhp/hr) or lubricating oil when operating under full load and using engine oil conforming lo Military Specificntion MIL-L-45199 Gracie 2 (OE 30). e. Fuel Co11s11111ptio11 (Jllithout Accessories). When operating nt full throttle under full loncl, on a dynamometer, at a speed of 2400 rpm, engine shall consume not more than 0.420 pounds per brake horsepower hour (lbs/bhp/hr) fuel conform- ing to Specification YV-F-800 (DF-2). When op- erating al full throttle under full load, on a dynamo meter a I 1800 rpm, the engine shall not consume more than 0.400 lbs/bhp/hr of fuel conforming to VY-F-800 (DF-2). f. Exhaust Gas Temperature. Ex11aust gas temp- eratures, measured at individual cylinder ports, shall not exceed 1250" F. Temperature variation a between cylimlers shall not exceed 150° P. under  full load conitions. g. Blow-by Pressure. With engine under full throllle and full load, blow-by shall not exceed 18 cfm with new cylinders, and 21 cfm wiU1 used cylinders. 11. lubricating Oil Temperature. Temperature of oil in U1e engine oil pan sump shall not exceed 250° f. Temperature of oil entering the engine through the oiJ pump shall be maintained between 140° F. and 250° r. i. Oil Pressure. Engine oil pressure shall not be more than 70 psi or less than 40 psi when engine is operating at 2400 rpm, and shall not be less than 15 psi when engine is idling at 700 rpm, measured at and/or adjacent to Lhe oil pressure sending unit, with oil temperature of 140° to 250° P., using engine oil specified ind above. j Temperatures. The preferred induction air inlet temperature is 85° F. plus or minus 10° r. 3·246 Change 3 k. Fuel Pressure. The fuel pressure at the injection pump inlet shall be 40-60 psi al engine speeds of 1800 lo 2400 rpm. I. Manifold Presure. Intake manifold pressure rise above atmospheric after the turbosupercharger with boost to 0 inches Ilg. atmospheric pressure, shall not exceed 35 inches I lg.; without boost 28 to 32 inches Ilg. Variation between left and right banks shall not exceed 4 inches Hg. 111. Exhaust Smoke Density Test. The maximum exhaust smoke clensi ty at full power position, with breather tube disconnected, when measured within one foot or the exhaust outlet, shnll nol exceed the following conditions when using fuel i11 accordance with grade DF-2 of Specification YV-F-800. Engine Robc•rt bosch RPM No. Vis11al meter No. 1800 3 Light Gray 3.5 2000 3 Light Gray 3.2 2200 2 llnze 2.6 2400 I Clear 2.4 NOTE The meter readings shall have precedence over the visual reading. 3-191. Engine Run-In a. General. This paragraph describes run-in schedules for overhauled or rebuilt engines prior to being placed in service. Engine run-in is performed after rebuild to assist in breaking in new parts. to detect faulty ;1ssembly, to check for oil leaks, and to determine whether an engine will operate satisfactorily when installed in vehicle. b. Preparation for R1111-i11. (I) Couple engine to suitable lond. The load may be a water brake or electric dynnmometcr. (2) Lubricate engine by forcing engine oil under pressure into lubrication system. This will insure adequate lubrication to engine parts until oil is circulated under pressure from engine oil pump. When prelubrication equipment is not :wailable, fill all ex leal lines and oil coolers with proper grade oil. Fill crankcase with proper grade oil. (3) Connect exteal source of fuel supply to engine. Connect same type air cleaners that are used with engine when installed in vehicle. Air intake should be located so that only cool, fresh air will be inducted into engine. A means must be provided for conducting exhaust gases and cooling air from engine to avoid recirculation through engine cool- ing fans. ) )