TM 5-4310-386-14
5-43. Engine Piston and Rings.
This task covers:
a.
Replace
b.
Repair
INITIAL SETUP
Tools
Materials/Parts
General Mechanic's Tool Kit
Piston, Engine
(NSN 5180-00-177-7033)
Piston Rings, Engine
Piston Heater (PN 0030414)
Solvent, Dry Cleaning (Item 24, Appendix E)
Piston Ring Expander (PN 0030496)
Rags, Wiping (Item 21, Appendix E)
Piston Ring Squeezer (PN 0030430)
Gage (PN 0030438)
Equipment Condition
Fixture (PN 003 1079)
Circlip Plier (NSN 5120-00-789-0492)
Compressor unit shut down (para. 2-13)
Engine cylinder removed (para. 5-42)
a.
Replace. (figure 5-64)
(1)
Using piston heater, heat piston (1) to about 178°F (80°C).
(2)
Using circlip pliers, remove two circlips (2) and slide piston pin (3) out of piston (1) and connecting rod (4),
and remove piston (1).
(3)
Using fixture, remove piston bushing (5).
(4)
Remove expander spring (6) from bottom ring (7).
(5)
Using piston ring expander, remove bottom oil control ring (7), two middle control rings (8) and (9) and top
compression ring (10).
(6)
Using piston ring expander, install bottom oil control ring (7).
(7)
Install expander spring (6) on bottom oil control ring (7).
(8)
Using piston ring expander, install two middle control rings (8) and (9), and top compression ring (10).
(9)
Using fixture, install piston pin bushing (5).
(10)
Install circlip (2) in boss that is to face cylinder that has not been dismantled.
(11)
Position piston (1) so that exhaust side (marked with an arrow on piston crown) faces the push rod bores.
(12)
Using piston heater, heat piston (1) to about 178°F (80°C).
(13)
Press piston pin (3) into piston boss and connecting rod (4).
(14)
Install second circlip (2) in piston boss.
5-178
