TM 5-3825-229-14&P
6-11. PISTONS AND CONNECTING RODS (cont)
a.
Removal (cont).
(3)
Turn crankshaft until piston is at bottom of its stroke. Remove connecting rod nuts (1). Remove bearing
caps (2) and free lower end of connecting rods (3) from crankshaft. Remove bearings (4) from bearing
caps (2) and connecting rods (3). Remove bolts (10).
CAUTION
Avoid scratching crankpin and cylinder wall when removing piston and rod. Protect crankshaft rod journals by placing a
piece of plastic tubing over rod bolts during removal.
(4)
Push rod and piston assembly out through top of cylinder using ahammer handle. Protect crankshaft rod
journals by placing a piece of plastic tubing over rod bolts during removal.
b.
Disassembly.
(1)
Remove piston rings (5) with a piston ring spreader.
(2)
Remove two retaining rings (6) with snap ring pliers. Push piston pin (7) out of piston (8).
(3) Remove connecting rod bushing (9) if visibly damaged. Press bushing from piston rod.
c.
Cleaning and Inspection.
CAUTION
Do not use a caustic cleaning solvent or wire brush for cleaning pistons. These materials will cause piston damage.
WARNING
Wear protective goggles when using the cleaning solvent. Avoid contact with the eyes. If contact occurs, flush eyes with
cold water for 5 minutes and seek immediate medical attention. Dry cleaning solvent (PD-680) is both toxic and
flammable. Avoid prolonged breathing of vapors. Avoid skin contact. Use only in a well-ventilated area. Keep away from
open flame. Flash point of solvent is 138°F (59C).
6-23
