TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download
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- - - - - > - - -��»[ , __ , ' "---� ENGl E OIL COOLER OIL COOLER - BYPASS VALVE ITHERMOSTATICl CLOSES AT IW f OPEllS IT 100 PSI OIL PRESSURE REGULATOR VALVE WAIN OIL FILTER BYPASS VALVE OIL FILHRS TM 9-2815-220-34 ' ;' ' " " TURBOSUPERCHArGE __ FUEL INJECTIl PUMP ' " OIL PUMP PRESSURE EUEF VALVE OPES AT 2SO PSI RESERVE COMPrRTME flT t'AKE UP PU�'PS fl VY.HEEL mo TA 126161 Fi s ure /.JO. E11si11e oil flow co111rol - j101U diagram. e. Oil mpling System. The oil sampling sy stem (fig. 1-1 and 1-6) on Models A V D.S -1 7 9 0 -2 C, AV D S - 1 7 9 0 - 2 D, AVDS-l 790-2CA, and AVDS-l 790-2DA is located on top of the right bank transmission oil cooler. The system consists of two toggle valves, one each for engine oil and transmission oil, and the tubing necessary to draw oil samples from the respeclive oil coolers. The valves permit easy sampling of the engine and transmission oil to determine the necessity for an oil change. 11tis feature eliminates unnecessary oil changes. f Oil Sampling Drain Cock. An oil sampliJ1g drain cock (fig. 1-7.3) is located on the oil filter cover of the Model AVDS-l 790-2DR engine.The drnin cock permits sampling of the engine oil to determine if its condition warrants an oil change. 1-16. Fuel System a. Fuel Supply Pump Assembly (Models A VDS- 1790-2C and AVDS-J 790-2D). The engine driven vane type fuel supply pump assembly (fig. 1-3) is used to supply fuel under pressure to the fuel injection pump. The fuel pump is crankshaft driven by the fuel pump drive adapter (44, fig. 1-8) and the drive coupling (43) located at the front of the engine. a. I. Fuel Supply Pump Assembly (Model A VDS- J 790-2DR). A right angle drive is provided on the drive housing for the vane type fuel supply pump assembly. The pump is similar to the one used on Models AVDS-1790-2C and AVDS- 1790-20 except that it rotates counterclockwise. The drive housing is lubricated with oil exteally routed from the engine main oil gallery on U1e right side of the crankcase. b. Fuel Injection Metering Pump. The fuel injec- tion metering pump is located in the "V" of the engine between the fan drive housings, and suppUes fuel under high pressure to each cylinder. The pump is driven at engine speed from the fan drive housing located at the rear of the engine. A fuel injection pump advance assembly (9, fig. 1-8) is incorporated in the accessory drive housing to au- tomatically provide a gradual degree advance of injection timing during the engine speed range from idle to 1800 rpm. c. Fuel Injector Nozzles and Tubes. Twelve fuel injector nozzles (fig. 1-11), one per cylinder, are used to inject fuel into the combustion chambers. Twelve fuel injector tubes of equal length carry the fuel from the fuel injection pump to the nozzles. The nozzles on each cyUnder bank are intercon- nected by fuel retu lines to provide a path for the retu of excess fuel. Change 3 1-15