TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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(a) Check fuel level and oil level gages (figure 6-199c). Fill supply tank (s) if either gage indicates less than half full (use oil, specification MIL-L-45199 (Grade 30) or fuel, specification VV-L-800). (b) Check to insure that the master switch, the oil heater switch, the jog run (clutch engage) switch, and the motor switch are all in the “OFF” position and that the speed regulator control is at zero (0). (c) Turn master switch handle to the “ON” position. Note that power indicator light comes on. If power indicator light does not light, press the reset buttons. If light still does not operate, investigate and correct the deficiency before starting. Figure 6-199c. Test stand heater control and supply tanks. (d) Turn oil heater (thermostat) control, figure 6-199c, to a setting of 250 degrees and turn oil heater switch, figure 6-199b “ON”. The oil heater indicator lamp will light when the heater switch is turned on and will go out when the oil has reached the selected oil temperature heater control setting (250 degrees). (e) Turn the electronic counter switch, figure 6-199b, “ON”. The electronic com- ponents in the counter will reach operating temperature by the time the test is begun. (f) Loosen fasteners and remove fuel injection pump drive housing cover from top of test stand. Remove the two bearing caps and intermediate bearing support from the mounting fixture, figure 6-201. (g) Install retaining ring on oil retaining shaft. Install short (stub) end of oil retaining shaft in driven (small) end of the advance assembly. Install support over bearing on large gear end of advance assembly and install ad- vance assembly in bearing supports of mounting fixture and secure with hardware removed above. Install drive housing cover and secure with fasteners. Caution: The fuel injector pump advance assembly drive housing cover must always be installed and secured before operating test stand. (h) Push jog run (clutch engage) switch to engage eddy current clutch and turn speed regulator control to obtain advance assembly speed of 300 rpm on tachometer. Turn speed regulator control clockwise to increase rpm. (i) Observe oil and fuel pressure in- dicator gages, figure 6-199b. These gages should register more than zero (0); however, maximum pressures will not be evident until a speed of 2000 rpm is obtained. Caution: Turn master switch handle “OFF” if there is no indication of oil or fuel pressure on the gages. Investigate and correct the deficiency before starting the test. (j) Operate test stand at 300 rpm until the oil temperature dial thermometer (H) stabilizes at 250 degrees. It may require several minutes to warm the entire system to operating tem- perature. Note and record electronic counter (K) reading (illuminated decimal digits on the front of the counter panel). (k) Press oil drain push switch, located immediately below the oil pressure indicator gage. The gage should register zero (0) psi with the switch depressed. observe the counter reading. If the counter has changed more than one (1) degree, the advance assembly requires adjustment. (1) Release oil pressure drain switch. Turn speed regulator control clockwise to in- crease the speed to 600 rpm. Note and record the 6-167