TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download
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(3) Remove piston rings from piston ((1) above). Scrape carbon from end gap and measure end gap. (4) Place rings in the specified ring gage (table 3-10) and measul'e end gap of oil rings as shown in figure 3-185). Replace rings not conforming to lim- its specified in the repair standards (table 3-11). Ring gages are identified according to ring size. Some gages are dual purpose tools, i.e., each side for a different size ring. TM 9-2815-220-34 � : t ' - l \ I . �1 I � · - TA021758 FigureS-185. Msuring pisto1t 1ing e1ulgapus pisto11 ri+g gage. Table -10. Piston ri 119 gages Ring gage 10912589 10912589-1 10912589-2 Gage identification 5. 7500 and 5. 7700 5.7600 and 5. 7800 0.7500 and 5.7900 Ring size identification Standard and 0.020 in. oversize 0.010 a11d 0.030 i11. overize Standard and 0.040 in. oversize I ����������������� ���������- . Inspect piston pin (8, fig. 3-183) for cracks, nicks, or wear. Check diameter of pins against lim- its specified in repair standards (table 3-11). Table 3-J J. Pistons, Pisto11 Rings a11d Piston Pi11s Repair Sta1idanl Fig. Ref. Point of Sizes and fits Component No. letter measurement of new parts Piston 3-183 u Diameter at bottom of skirt Z degrees to piston pin STD 5.7410 5.7420 0.0100 oversize 5.7510 5.7520 0.0200 oversize 5.7610 5.7620 0.0300 oversize 5.7710 5.7720 0.0400 ovei·size 5.7810 5.7820 3-183 q Diameter of top groove in piston (measured over 0.ll67 dia. pins) STD 5.7140 5.7240 0.0100 oversize 5.7240 5.7340 0.0200 oversize 5.7340 5.7440 0.0300 oversize 5.74'10 5.7540 0.0400 oversize 5.7540 5.7640 See fꝏtno at end of table. Wear limits 5.7380 5.7480 5.7580 5.7680 5.7780 5.7040 5.7140 5.7240 I 5.7340 5.7440 Change 2 3·96 .1