5-43. Engine Piston and Rings.

Figure 5-64. Engine Piston and Rings, Replace.

TM-5-4310-386-14 Compressor Reciprocating Air: Electric Motor Driven & CFM 175 PSI C & H Model 20-918 Manual
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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

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