NMWR-9-2815-220 Overhaul Manual for M60 M88 Engine AVDS-1790-2CA, AVDS-1790-2DA, AVDS-1790-2DR Download
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NMWR 9-2815-220 EQUIPMENT DESCRIPTION AND DATA—Continued 0002 00 LOCATION AND DESCRIPTION OF MAJOR COMPONENTS - CONTINUED (5) Oil Sampling System. The oil sampling system consists of two toggle valves connected to the oil cooling system permitting easily accessible sampling of the engine and transmission oil to determine the need for oil changes. This permits a more precise method of determining the frequency of oil changes. On the models AVDS-1790-2CA and AVDS-1790-2DA there are two valves mounted together on top of the right bank oil coolers, one valve for engine oil and one for transmission oil. Engine model AVDS-1790-2DR has only one valve located on the filter housing cover on the front of the engine. i. Fuel System. The fuel systems used on the AVDS-1790-2CA and AVDS-1790-2DA engines are identical. Figure 3 is a schematic diagram of the main fuel system used on these engines. The fuel system used on the AVDS-1790-2DR engine is similar except for the differences in the fuel supply pump assembly drive and routing of fuel injection pump overflow fuel. Figure 4 is a schematic diagram of the main fuel system used on the AVDS-1790-2DR engine. (1) Fuel Supply Pump Assembly (AVDS-1790-2CA and AVDS-1790-2DA). The engine driven vane type fuel supply pump assembly is used to supply fuel under pressure to the fuel injection pump. The fuel pump is crankshaft driven by the fuel pump drive adapter (50, Figure 1) and the fuel pump drive coupling (49, Figure 1) located at the front of the engine. (2) Fuel Supply Pump Assembly (Model AVDS-1790-2DR). 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 the other models except that it rotates counterclockwise. The drive housing is lubricated with oil externally routed from the engine main oil gallery on the left side of the crankcase. Figure 2. Engine Oil Flow Control – Flow Diagram. 0002 00-7 Change 1