TM-9-2815-205-24 Technical Manual for M113 Engine 6V53 6V53T Download
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ASSEMBLY - Continued WARNING Rings are extremely sharp. Do not grasp or graze sharp edges of oil control rings with bare hands. Failure to comply may result in injury to personnel. CAUTION Do not spread rings more than necessary to slip over piston. Ring breakage and overstressing will result. NOTE Upper oil control ring groove requires one thick ring and lower groove requires two thin rings. Install upper and lower oil control rings in lower groove by hand. Scraper edges of all oil control rings must face downward (toward bottom of piston) for proper oil control. d. Install new lower oil control ring (Figure 13, Item 13) in lower groove with gap 180 degrees from gap in expander (Figure 13, Item 14) in groove C and then install upper oil control ring in lower groove with gap 45 degrees from gap in other ring. e. Using piston ring tool, position new upper oil control ring (Figure 13, Item 9) over groove (Figure 13, Item D). Position gap in oil ring 180 degrees from gap in expander (Figure 13, Item 15). Press ring against gap side of expander to prevent ends of expander from overlapping. Align ring with groove and release tension on remover and replace. f. Starting with bottom compression ring, install three new compression rings (Figure 13, Item 12) and new fire ring (Figure 13, Item 11) using piston ring tool. Install fire ring with side marked “TOP" or side with dark color dot toward top of piston (Figure 13, Item 10). 9 15 13 14 13 11 12 D C 90° 90° 180° 10 LOWER PISTON RING LOCATION UPPER PISTON RING LOCATION MAINT_365 Figure 13. Piston Ring Placement. TM 9-2815-205-24 0094 0094-15