TM 5-3825-230-14&P
5-20. PISTON REPAIR/RING SET REPLACEMENT (CONT).
c. Installation.
(1)
Install compression rings (1 and 2) using a piston ring expander, mount with ring end gaps staggered 180°
starting just to either side of wrist pin.
Mount chromium-edged ring at top.
(2)
Install oil ring (3) 180° staggered from bottom compression ring (2).
(3)
Coat rings and piston with lubricating oil.
(4)
Measure ring to ring groove clearance using calipers. If excessive, replace piston.
(a)
Top compression ring clearance 0.0098 in. (0.25 mm).
(b)
Second compression ring clearance 0.0059 in. (0.15 mm).
(c)
Lower ring (oil control) clearance 0.0059 in. (0.15 mm).
NOTE
Follow-on maintenance: Install engine cylinder (para 5-9)
END OF TASK
5-42
