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TM 5-4320-308-13
4-19.
INSPECT/REPAIR/REPLACE PISTON (Continued)
ASSEMBLY:
1 If cylinder has been replaced, piston must also be replaced.
CAUTION
Piston rings are marked TOP and should be installed as marked. Piston ring
breakage may occur if rings are opened more than necessary when removing or
installing them. Do not strain rings.
2
If piston replacement is necessary, piston rings must also be replaced.
3
Install piston rings with piston ring pliers 612 090 00. Install oil control ring (1), cast iron compression ring (2),
and chrome compression ring (3) in order. Be careful not to strain rings by opening them too wide during
installation. Make sure that the piston ring gaps are equally spaced around the piston 120 degrees from each
other.
4 Install new circlip (1) in lip groove of piston (3) gudgeon bore.
CAUTION
When installing piston, make sure piston or connecting rod do not knock against
crankcase. This could result in serious damage to piston or connecting rod.
5
Insert connecting rod (4) into bottom of piston (3). Make sure that opening of combustion chamber is on the
flywheel side.
6
Insert gudgeon pin (2) into piston (3) gudgeon bore and through rod bushing of connecting rod (4). Push in
gudgeon pin until it contacts installed circlip (1) and stops.
7
Install new circlip (5).
4-57
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