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 0047 00 GENERAL CRANKCASE AIR PRESSURE TEST 1. Leak Test. After final assembly, the engine must be pressure leak-tested by sealing all engine openings to ambient with appropriate plugs and covers and applying 5 psi (10.2” Hg.) air pressure into the engine crankcase through a gage and shut-off valve. Check all joints, seals, etc. for leaks by applying a solution of liquid soap or detergent and water. Repair leaks and retest. 2. Pressure Drop Test. The engine must be pressure leak-tested by sealing all engine openings to ambient with appropriate plugs and covers and applying 3 psi (6.1” Hg.) air pressure into the engine crankcase through a gage and shut-off valve and shutting off the air supply. A maximum pressure drop from 3 psi (6.1” Hg.) to 1.25 psi (2.5” Hg.) in a 3 minute period is acceptable. A pressure loss of more than 1.75 psi (3.6” Hg.) in a 3 minute period is cause for rejection. FINAL PERFORMANCE CHECK 1. Engine Specifications. The specifications listed below must be met by overhauled engines. a. Fuel and Oil. Final performance tests must be made using fuel conforming to MIL-DTL-83133 (JP8). Engine lubricating oil must conform to MIL-PRF-2104G, Type I, Grade 15W40. b. Speed Range. The engine must operate satisfactorily under all loads through a speed range of 1000 to 2400 rpm and must idle satisfactorily at 700 to 750 rpm. c. Corrected Gross Brake Horsepower (CGBHP) (Without Accessories). Under full throttle setting, the engine will develop 750 plus 30 or minus 15, corrected gross brake horsepower at 2400 rpm, using fuel conforming to MIL-DTL-83133 (JP8) when tested using proper correction factors. See 4. below. d. Gross Torque (Without Accessories). Under full throttle setting, engine will develop the following gross torque using fuel conforming to MIL-DTL-83133 (JP8). (1) 1770 to 1843 lbs-ft. at 1800 rpm (607-631 CGBHP). (2) 1609 to 1707 lbs-ft. at 2400 rpm (735-780 CGBHP). e. Oil consumption. The engine must not consume more than 0.0075 pounds per brake horsepower hour (lbs /bhp-hr) of lubricating oil when operating under full load with engine oil temperature between 140° F and 250° F (60° C and 121° C) measured at the main oil gallery (oil cooler outlet) and using engine oil conforming to MIL-PRF-2104G, Type I, Grade 15W40. f. Fuel Consumption (Without Accessories). When operating at full rack - full load, on a dynamometer, at a speed of 2400 rpm, the engine must consume not more than 0.420 pounds per brake horsepower hour (lbs/bhp-hr) of fuel conforming to MIL-DTL-83133 (JP8). When operating at full rack - full load on a dynamometer at 1800 rpm, the engine must consume not more than 0.400 lbs /bhp-hr of fuel conforming to MIL-DTL-83133 (JP8). g. Exhaust Gas Temperature. Exhaust gas temperatures, measured at individual cylinder ports, must not exceed 1250° F (677° C). Temperature variations between cylinders must not exceed 150° F (66° C). 0047 00-1 Change 1 Final Assembly. Final assembly consists of assembling the engine subassemblies. Refer to TM 9-2815-220- 34 for assembly instructions.