TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download
Page 346 of 779
6-29. Disassembly a. Cylinder. Disassemble cylinder assembly following instructions which accompany figures 6-47 through 6-49. Note. The 12 rocker arm cover assemblies are machined with cylinder assemblies as matched units. The covers are stamped with matching numbers (fig. 5-105) to correspond with the number stamped on the cylinder. Keep covers with their respective cylinders. 1. Place cylinder with valves, springs, and retainers on removing and inserting valve stand - 4910-554-1317 (A). 2. Secure valve lifter assembly - 5120-678-5285 to the cylinder head with four bolts (B) and flat washers. Figure 6-47. Cylinder showing position of valve lifter assembly - 5120-678-5285 and removing and inserting valve stand - Warning: The valves and locks are under heavy spring tension. Exercise extreme care when removing locks, retainers and springs. 1. Compress exhaust valve spring and upper retainer. 2. Remove two valve locks (A) from the groove in valve stem. Tap valve spring retainers to free locks. Carefully loosen lifter screw to release valve springs. 3. Remove intake valve spring upper retainer locks (B) in the same manner. 4. Remove lifter assembly (C). Figure 6-48. Compressing exhaust valve springs to remove or install upper valve spring retainer and locks. 4910-554-1317. 6-52