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

  TM-9-2815-205-34 - Page 338 of 596

TM 9-2815-205-34
3-51. PISTON AND CONNECTING ROD MAINTENANCE - CROSS-HEAD (MODELS 5063-5392,
5063-5393, 5063-539F, AND 5063-539L) (Cont)
(2)
Installation - Piston Rings
(a) Lubricate piston rings and piston with engine oil before installing rings.
CAUTION
Do not allow ends of oil ring expanders to overlap. An overlapped expander will cause
oil ring to protrude beyond allowable limits and result in breakage when piston is
inserted in ring compressor during installation in cylinder liner.
Do not cut or grind ends of expanders to prevent overlapping. Cutting or grinding ends
will decrease expanding force on oil control rings and result in high lubricating oil
consumption.
(b) Install two oil ring expanders (15) in oil control ring grooves in piston skirt (21) with legs of
free ends pointing toward bottom of piston.
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 any more than necessary to slip them over piston. Ring breakage
and overstressing will result.
NOT E
Install oil control rings in lower groove by hand.
Upper oil control ring groove requires one thick ring and lower groove requires two thin
rings.
Install upper oil control ring in lower groove with scraper edge facing up. Install lower oil
control ring with scraper edge facing down.
(c)
(d)
Install lower thin oil control ring (13), scraper edge down, in groove C (lower groove) with
gap in ring 180 degrees from gap in expander (15). Then install upper ring (13), scraper
edge up, in groove C with gap 180 degrees from gap in lower ring.
Using ring pliers, install thick oil control ring (12) in groove D (upper groove). Position gap in
ring 180 degrees from gap in expander (15). Press ring against gap side of expander to
prevent ends of expander from overlapping. Align ring with groove and release tension on
pliers.
3-208
Change 1


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