TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
Page 549 of 779
(7) Add oil as required to bring oil in oil pan to full level as indicated on oil level gage, carefully measuring amount added. (8) Maximum allowable oil consumption at 2400 rpm, with SAE 30 oil, is 0.0075 pounds per brake horsepower hour (lbs / bhp / hr). g. Checking Exhaust Gas Temperature. Pipe plugs (4, fig. B-12) are provided in exhaust manifold elbows for installation of ther- mocouples to measure exhaust gas temperatures (para 8-1f). Variations of temperatures between cylinders should not exceed 150°F. Check fuel injector nozzles of cylinders that exceed this variation. h. Lubricating Oil Pressure Outlets. Lubricating oil pressure outlets are provided in the main and piston oiler nozzle gallery lines for installation of pressure sensing gages to measure the engines oil pressures (para 8-1i, (1) and (2)). i. Induction Air Temperature. An outlet is provided in the bottom of the intake manifold, on each side of the engine, for installation of thermocouples to measure induction air tem- perature (para 8-1j). j. Manifold Pressure. An outlet is provided in the intake manifold elbows, on each side of the engine, for installation of a manometer gage and / or connection (para 8-11). Table 8-1. Overhaul Test Schedule-Beam Length...1.75 Ft. (or 21.008 in.) Run No. Time Min. RPM Scale limits Obs. BHP 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 10 700 Warm-up 15 1000 16.0 16.0 15 1400 83.5 116.9 20 1800 159.5 287.1 20 2200 195.0 429.0 20 2400 208.0 499.2 30 2400 229.0 549.6 Torque Lh-Ft. 84 438 837 1024 1092 1202 F.R. - F.L. 30 2400 F.R. - F.L. F.R. - F.L. Check for low idle at 675 to 725 rpm. Adjust if necessary. Check oil filter and inspect for oil and fuel leaks. 5 2200 F.R. - F.L. 5 2000 F.R. - F.L. 5 1800 F.R. - F.L. Check governor high idle speed. This shall not exceed 2640 rpm, (No-Load, water off). If adjustment is required, recheck horsepower at 2400 full load. Borescope cylinders (para 8-6), check for fuel and oil leaks, prepare engine for removal from stand. Note. Run numbers 1 through 8, and 11 through 14, shall equal three hours. Sequence of operations may be varied. 8-6. Inspection of Cylinders for Scuffing a. General. (1) As used in this publication, cylinder wall “scuffing” is defined as a streak or streaks, running the length of the piston ring travel, on the cylinder wall, which are greater than 1 / 4 inch wide and which reveal a high gloss or polish where the cylinder wall honing pattern has been completely worn away. (2) Scuffing is caused by excessive localized heat on the contact face of the piston ring and cylinder bore. The excessive heat is due to a breakdown of the oil lubricating film and is the result of one or more conditions such as; abrasives in the oil or induction air, lack of or improper honing, defective piston ring, etc. The heat and pressures involved during the scuffing process will flow or smear the cylinder wall metal and destroy the honing pattern. The process in general generates additional heat due to friction and in many cases the scuffing will progress or the width of the afflicted area will grow and may envelope the entire cylinder bore. Scuffing is detrimental to the engine, since oil consumption and blow-by gases can no longer be controlled. b. Borescope Inspection. (1) After completion of dynamometer in- spection, all overhauled engines shall have cylinders inspected by borescope as follows: 8-7