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 o. Transmitters and Switches. The engines are equipped with an oil pressure gage transmitter, an oil temperature transmitter, a low oil pressure warning light switch, and a high engine oil temperature warning light switch. In addition to these, the AVDS-1790-2DR engine also is equipped with an auxiliary generator high oil pressure sending switch. (1) Oil Pressure Gage Transmitter. The electrical oil pressure gage transmitter is located to the front of the crankcase at the opening in the gallery line below the No. 1 right cylinder. This sealed transmitter consists of a threaded plate to which a diaphragm, a radially notched spring, and an overload guard plate are crimped. Electrical resistance in the transmitter varies directly as the oil pressure varies. The resulting variation in the current is transmitted to the electrical oil gage on the vehicle instrument panel. (2) Low Oil Pressure Warning Light Switch. The low oil pressure warning light switch is furnished with the engine and is located at the lower right side of the crankshaft damper and oil filter housing. The electrical contact points in this switch close when the oil pressure in the main oil gallery is below 11 ± 2 psi. The completion of the electrical circuit lights the low pressure warning lamp on the vehicle instrument panel. (3) Oil Temperature Transmitter. The oil temperature gage transmitter is located at the upper right side of the crankshaft damper and oil filter housing above the oil pressure regulator valve. (4) High Engine Oil Temperature Warning Light Switch. The oil temperature warning light switch is located in the oil passage above the oil pressure warning light switch in the right side of the crankshaft damper and oil filter housing. The warning light sending switch, thermostatically controlled electrical contact points, close when oil temperature in the engine main oil passage reaches 245 ± 5°. The completion of the electrical circuit lights the oil high temperature warning lamp on the vehicle instrument panel. (5) Auxiliary Generator High Oil Pressure Sending Switch (Model AVDS-1790-2DR). The auxiliary generator high oil pressure sending switch is located at the right front of the crankcase in the tee that mounts the oil pressure gage transmitter. This switch prevents simultaneous operation of the main engine and auxiliary generating systems. DIFFERENCES BETWEEN MODELS 1. General. This section describes the differences between the engine Models AVDS-1790-2CA, AVDS-1790- 2DA, and AVDS-1790-2DR. All models are similar, and all use the same major components. The major components consist of the crankcase, crankshaft, cylinders, pistons, connecting rods, camshafts, damper housing, turbosuperchargers, starter, fuel injection pump, and fuel supply pump. 2. Model AVDS-1790-2CA. This engine is equipped with a 28 volt, 650 ampere oil cooled dc generator and a clean air package consisting of the dust detector system and the dust ejector system. a. Dust Detector System. The dust detector system provides dust detection capabilities for dust being ingested into the engine air induction system. b. Dust Ejector System. The dust ejector system provides dust ejection capabilities for dust being ingested into the vehicle air cleaner system. 0002 00-17 Change 1