TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download
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TM 9-2815-220-34 USE END OF TOOL IDENTIFIED AS TOP TAPERED RING GROOVE GAGE PISTON NO. 1168394.3 ONLY TA055584 re 3·183. J. Cecki11g piston top ring grꝏve usg tapered piston ring gage. c. Inspect compression ring (11) and (12), and oil control ring (10) for scuffing, scoring, chipping, scratches or abrasions. Pay particular attention to those rings which were found to be sticking in the piston ring grooves. Instal I the three lower rings in their original position and check side clearance as described in (1) through (4) below. (1) Insert remover and replacer Part No. 7950177 in end gap ofring (fig: 3-181) and install oil control ring in bottom piston l' ing groove. Install two in- termediate compression rings in the same manner. (2) Measure side clearance of the three bottom rings with a thickness gage as shown in figure 3·184. Mark all rings for replacement that are not within limits specified in repair standards (table 3-10). 'he upper compression ring (12, fig. 3-183) may be checked by measuring the diameter over roll pins or by using the tapered piston ring groove improvised tool. Excessive side clearance indicates worn rings and/or worn piston grooves. Less th'n normal !clearance� indicates probable damage or breakage at the ring land. 3·96 Change 3 TA021792 Figure 3·184. Checki11g piston 1ing side clearance. )