NMWR-9-2815-220 Overhaul Manual for M60 M88 Engine AVDS-1790-2CA, AVDS-1790-2DA, AVDS-1790-2DR Download
Page 821 of 1014
NMWR 9-2815-220 FINAL ASSEMBLY AND TESTING—Continued 0047 00 FINAL PERFORMANCE CHECK – Continued m. Governor shall be adjusted to limit the engine no-load speed as follows: Low Idle 700-750 rpm High Idle 2600-2660 rpm n. Adjust for smooth low idle, if necessary. Governor under-run below low idle setting during deceleration is permissible providing the governor return to low idle response is positive with a steady operation at the low idle setting. o. During test with oil temperature of 140° F to 250° F (60° C to 121° C) measured at the main oil gallery (oil cooler outlet), the oil pressure shall not be more than 70 nor less than 40 psi measured at and/or adjacent to the pressure sending unit, when the engine is operating at 2400 rpm, using MIL-PRF-2104G Type I, Grade 15W40 oil and shall not be less than 15 psi when engine is idling (700 to 750 rpm). p. After completing run no. 16, check flame heater system for operation and fuel leaks. q. On ADVS-1790-2DR engines, after run no.11, adjust the PTO speed to 1750-1800 rpm, no load, dyno water off. 4. Final Performance Check Computations. The computational data included below is for use in entering information in the final performance check log sheets. a. Observed Brake Horsepower (obs. bhp.). Calculate obs. bhp. as follows: obs. bhp. = 2 p LWN or 2 p NT = TN = beam x 3 x 1.75 x N = beam x N 33000 33000 5252 5252 1000 where - L = length of torque arm in feet (21.0080 in. or 1.7507 ft.) (53.3603 cm) N = rpm of dynamometer shaft T = torque in lb-ft. = LW = beam x 3 x 1.75 W = force in lbs. at length L p = 3.1416 b. Corrected Net bhp. The corrected net brake horsepower is calculated as follows: corrected net bhp. = obs. bhp. x correction factor c. Correction Factor. Correction Factor = CF T x CF P x CF F where - CF T = Temperature Corr. Factor at turbocharger air inlet (Table 2) CF P = Barometer Air Pressure Corr. Factor at turbocharger air inlet (Table 3) CF F = Fuel Temperature Corr. Factor at the primary fuel filter inlet (Table 4) d. Corrected Gross Brake Horsepower. Determine corrected gross brake horsepower as follows: corrected gross bhp. = corrected net bhp. + fan hp. Fan horsepower values are listed in Table 5 0047 00-5 Change 1