TM-9-2815-205-34

ENGINE WITH CONTAINER; MODELS 5063-5299, 5063-5392, 5063-5393, 5063-5395, 5063-5398, 5063-539F, 5063-539L

TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

AUGUST 1992

TM-9-2815-205-34 - Page 320 of 596

TM 9-2815-205-34

3-50. PISTON AND CONNECTING ROD MAINTENANCE - TRUNK (MODELS 5063-5299,

5063-5395, AND 5063-5398) (Cont)

Do not grasp or graze sharp edges of oil control rings with bare hands. Rings are

extremely sharp and can cut personnel when mishandled.

CAUTION

Do not spread rings more than necessary to slip over piston. Ring breakage and

overstressing will result.

NOT E

•

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)

(e)

(f)

(g)

Install lower oil control ring (12) in lower groove with gap 180 degrees from gap in expander

(15) in groove C and then install upper oil control ring in lower groove with gap 45 degrees

from gap in other ring.

Using piston ring pliers, position upper oil control ring (11) over groove D. Position gap in oil

ring 180 degrees from gap in expander (14). Press ring against gap side of expander to

prevent ends of expander from overlapping. Align ring with groove and release tension on

pliers.

Starting with bottom compression ring, install three compression rings (10) and fire ring (9)

using piston ring pliers. Install fire ring with side marked "TOP” or side with dark color dot

toward top of piston (13).

Stagger compression and fire ring gaps around piston a minimum of 90 degrees from each

other.

3-190

WARNING