TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
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1. Sparingly coat cylinder stud threads (A) on crankcase with antiseize thread lubricant FSN 9150-527-1752 or 9150-663-1770. Caution: If lubricant is extended to face of washer nut, reliable retaining torque cannot be obtained. 2. Rotate engine crankshaft using engine turning splined wrench-5120-793-7895 (fig. 5-91) until the No. 1R connecting rod (B) is at the top of its stroke. 3. Remove crankcase protector-4910-795-7951 from cylinder No. 1R mounting studs (C) being careful not to allow connecting rod to forceably drop against the crankcase cylinder mounting surface or mounting studs. 4. Remove piston pin from piston of No. 1R cylinder assembly and place piston and cylinder over No. 1R connecting rod. Insert piston pin (D) with plugs through connecting rod and piston and center pin in position. Center piston pin plugs in piston. 5. Slide cylinder (E) over piston on crankcase studs and temporarily secure with two extended washer nuts (fig. 5-144) positioned approximately 180 degrees apart. (c) When all cylinder assemblies are installed as described and illustrated in figure 7- 13, install remaining cylinder extended washer nuts and torque tighten the nuts alternately to 640 pound-inches. Use box wrench - 5120-678- 5287 in combination with a torque wrench as shown in figure 5-143. b. Cylinder Air Deflectors. Refer to figures 5- 142 and 5-141. c. Crankshaft Damper and Oil Filter Housing. Refer to figures 5-139 and 5-138. d. Oil Pan. Refer to figures 4-125, 5-137 through 5-135 and torque tighten oil pan bolts to 175 pound-inches and self-locking nuts to 225 pound-inches. Tighten four slotted nuts (C, fig. 6-90 or C, fig. 6-92) and install locking wire. Note. During overhaul operations, con- sideration must be given to engine model, when assembling oil pan to engine. Engine Model AVDS-1790-2-M had an oil pan (10865039, fig. 7-14) with oil drain plugs located specifically designed for a certain vehicle and the engine model was not interchangeable with other vehicles. The oil pan (10912162, fig. 7-15) on engine Models AVDS-1790-2-AM and AVDS- 1790-2A provides an oil drain plug location that is accessible in all vehicles. Although limited numbers of early oil pans are in current use, care must be taken in Depot overhaul to identify the early oil pans and properly designate engine model. Figure 7-13. Installing cylinder assemblies on crankcase. 7-10