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 FINAL ASSEMBLY AND TESTING—Continued 0047 00 FINAL PERFORMANCE CHECK – Continued c. Crank the engine several revolutions with the fuel shut-off switch in the OFF position to make certain the engine is not hydrostatically locked and is otherwise free. d. Start engine by operating electric starting motor while slightly depressing throttle. CAUTION Do not operate the starting motor continuously for more than thirty seconds. Allow a two-minute cool-off period before re-energizing starter. CAUTION Do not re-engage starter when engine is rotating. CAUTION If oil pressure does not reach indicated pressure within twenty seconds, stop the engine immediately by holding the fuel shut-off switch in the OFF position. Determine cause of low oil pressure. While engine is running, one operator is to be at the control at all times. e. After starting, check all items vital to safe engine operation, such as fuel lines, oil lines, oil pressure, throttle control, mounting bolts, couplings, thermocouple harness, etc. Make sure test cell, observation window, and control room are neat and clean. During the warm-up period, fill out heading of log sheet completely. f. Set manifold pressure manometers to the local uncorrected wet barometer reading and entrance air inclinometer to local uncorrected dry barometer reading, as applicable. g. Check cylinders for firing. Enter time and rpm at start of each period. Complete readings as soon as engine temperatures have stabilized. h. Exhaust gas temperatures, measured at individual ports, must not exceed 1250° F (676° C). Temperature variation between cylinders must not exceed 150° F (66° C). i. Record the entrance air temperature between 60° F to 100° F (16° C to 38° C) and use air entrance temperature correction factor per Table 2. j. On run no. 10, repair all fuel and oil leaks. Upon completion of the power runs and prior to the cool-down run, the rear oil seal area and the transmission shrouds will be cleaned of all oil and grease. On completion of the cool-down run, the rear oil seal area will be inspected, and if there is no evidence of oil being slung to the transmission shrouds, the engine will be accepted. Check again before engine is removed from stand and again before shipping. k. At completion of acceptance run, check acceleration, idle speed, and idle oil pressure. Acceleration should be checked with a moderate steady throttle movement. l. On acceptance test, if power is outside limits, check for cause and make correction. Gross corrected brake hp. shall be maintained between 735 and 780 at 2400 rpm, full rack - full load and 607-631 at 1800 rpm. 0047 00-4 Change 1