TM 5-4310-452-14
5-12. PISTONS AND CONNECTING RODS MAINTENANCE (Con't).
2.
Place piston (6) and connecting rod (8) in oven, and
heat to 176°F (80°C) for 30 minutes.
WARNING
Piston and connecting rod will be
hot and can cause severe burns.
3.
Remove piston (6) and connecting rod (8) from
oven and place in piston cradle.
4.
Drive piston pin (5) out of piston (6) and connecting
rod (8).
5.
Using ring expander, remove double trapezoidal
compression ring (1), tapered compression ring
(2), and oil control ring (3) from piston (6), Discard
rings.
6.
Remove piston pin bushing (7) and bearing sleeve
halves (12) from connecting rod (8).
7.
Remove alining pin (11) from connecting rod (8).
c.
ASSEMBLY
1.
Clean grooves in piston (6). Using ring expander and new rings as follows:
(a) TOP GROOVE - Double trapezoidal compression ring.
(b) MIDDLE GROOVE - Tapered compression ring. Install with 'top" facing up.
(c) BOTTOM GROOVE - Oil control ring.
2.
Insert new double trapezoidal compression ring (1) and tapered compression ring (2) in cylinder one at a time and
check gap with feeler gage. Gap for compression rings (1 and 2) should be 0.35-0.55 mm (0.014-0.022 in.).
3.
Insert new oil control ring (3) in cylinder and check gap with feeler gage. Gap should be 0.25-0.40 mm (0.0098-
0.0157 in.).
4.
Install piston pin bushing (7) and bearing sleeve halves (12) in connecting rod (8).
5.
Install alining pin (11) in connecting rod (8).
TA505576
5-30
