TM-9-2815-202-34 Technical Manual for 8V71T Engines for M109 Howitzer Download
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(c) (d) TM9-2815-202-34 Install lower half of lower oil control ring (17) with gap 90 degrees from gap in expander. Then install upper half of lower oil control ring (18) with gap 180 degrees from gap in expander. Install upper oil control ring (19) over upper groove. Aline gap in oil ring 180 degrees from gap in expander (1 6). Press ring against gap side of expander to prevent ends of expander from overlapping. CAUTION Do not spread rings more than necessary to slip over piston. Ring breakage and overstressing will result. NOTE Compression rings have no marks on top or bottom of rings. Fire ring has one mark (indentation near gap) on top of ring. (e) (f) Starting with bottom compression ring (20), install three compression rings using piston ring pliers. Install fire ring (21 ) with identification mark toward top of piston (10). Stagger ring gaps around piston a minimum of 90 degrees from each other. 6-39