TM-9-2815-200-35 Maintenance Manual for AVDS-1790-2M AVDS-1790-2A and AVDS-1790-2AM Engines Download

Table 6-13. Pistons, Piston Rings and Piston Pins overhaul Standards Fig. Component No. — Piston B-4 B-4 B-4 B-4 B-4 B-4 Piston Pins B-4 B-4 B-4 B-4 B-4 Piston Rings B-4 B-4 B-4 B-4 B-4 B-4 B-4 B-4 B-4 Piston Rings B-4 B-4 B-4 Ref. letter QQ KK LL MM NN J J-H G F-G CC EE LL- EE DD GG MM- GG FF JJ NN- JJ HH L 00-L Point of measurement Diameter at bottom of skirt 90 degrees to piston pin Diameter of top groove in piston (measured over 0.11547 dia. pins) Inside width of top intermediate groove in piston Inside width of lower intermediate groove in piston Inside width of oil control ring groove in piston Inside diameter of piston pin bore in piston Outside diameter of piston pin Fit of piston pin in Piston Outside diameter of piston pin plugs Inside diameter of bore in piston pin Fit of piston pin plug in piston pin Gap clearance of top compression ring when fitted in gage Outside width of top intermediate compression ring Clearance between ring and piston Gap clearance of ring when fitted in gage Outaide width of lower compression ring Clearance between ring and piston Gap clearance of ring when fitted in gage Outaide width of oil control ring Clearance between ring and piston Gap clearance of ring when fitted in gage Cylinder bore diameter measured up 2.250 inches from bottom of cylinder skirt Fit of piston in cylinder bore, measured up Sizes and fits of new parts 5.7415 5.7425 5.7380 5.7480 0.0990 0.1000 0.0980 0.0990 0.1880 0.1890 2.0018 2.0020 2.0000 2.0002 0.0016L 0.0020L 0.9975 0.9985 0.9995 1.0005 0.0010L 0.0030L 0.0500 0.0600 0.0925 0.0935 0.0055L 0.00075L 0.0500 0.0600 0.0925 0.0935 0.0045L 0.0065L 0.0500 0.0600 0.1850 0.1865 0.0015L 0.0040L 0.0300 0.0500 5.7510 5.7530 0.0075L 0.0115L Wear limits 5.7385 to 5.7435 5.7280 0.1035 0.1025 0.1910 2.0012 to 2.0030 1.9998 0.0006L: to 0.0032L * * * * * 0.0110L * * 0.0100L * * 0.0060L * 5.7600 0.0215L 2.250 inches from bottom of cylinder skirt, 90 degrees to piston pin Note. Refer to paragraph 6-3b for explanation of symbols. 6-49