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 (3) Observed Brake Horsepower. The observed brake horsepower (obs. bhp.) is calculated as follows: obs. bhp. = rpm x scale units = 2400 x 255 = 612.0 1000 1000 or obs. bhp. = torque x rpm = 1340 x 2400 = 612.0 5252 5252 (4) Corrected Net Brake Horsepower. The corrected net brake horsepower value is calculated from the observed brake horsepower using the previously determined correction factor: corrected net bhp. = obs. bhp. x correction factor = 612.0 x 1.03240 = 631.83 hp. (5) Fan Horsepower. The fan horsepower is determined at 2400 rpm from Table 5 to be 108.0 hp. (6) Corrected Gross Brake Horsepower. The corrected gross brake horsepower is determined by adding the fan horsepower to the corrected net brake horsepower - corrected gross bhp. = corrected net bhp. + fan hp. = 631.83 + 108.0 = 739.83 bhp. (7) Brake Specific Fuel Consumption. The brake specific fuel consumption is calculated by dividing the corrected fuel consumption (lbs/hr.) by the corrected gross brake horsepower - brake specific fuel consumption = obs. fuel flow (lbs/hr.) x CF F = 308 x 1.010 = 0.420 lbs/bhp - hr. corrected gross bhp. 739.83 ENGINE PRESERVATION PROCEDURE 1. Equip an auxiliary fuel container, with a fuel line, and fill with a sufficient amount of preservative oil, conforming to Specification QPL-32033-1, to operate the engine as prescribed below. Arrange the container to provide adequate pressure to assure proper supply of the preservative oil to the fuel system. Disconnect the fuel line at the most convenient point nearest to the engine fuel pump and connect the line from the auxiliary fuel container to the fuel-to-engine line at the point of disconnect. Disconnect the engine fuel return line and connect a transparent plastic tube to the fuel return connection. Insert other end of plastic tube into a container to collect the return diesel fuel. The fuel valve on the auxiliary fuel container must be turned to the ON position; the engine started and operated at 750-1000 rpm until observed fuel return is purged of diesel fuel and the system filled with preservative oil. 2. Drain lubricating oil from engine. 3. Remove engine from test stand and cap or plug all openings. 0047 00-7 Change 1