TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download
Page 184 of 532
TM 9-2815-220-34 tighten securely. Crank engine several seconds, or until the compression gage reaches maximum reading. Cylinder compression must be within 330 to 480 psi at engine cranking speed. Depress gage vent valve (fig. 2-150) to release pressure and reset gage to zero after compression reading is taken. Test compression on all cylinders in the same manner. 2ยท96 Change 2 NOTE ๎๎ cylinder pressures are caused by com- bustion of lubricating oil in the engine combustion chamber. If this occurs, allow combustion gases to escape prior to taking compression readings by motoring the engine with the starter for 30 seconds with the fuel supply shut off. (