TM 5-4320-302-14
6-16.
PISTON ASSEMBLY (CONT)
Location/Item
Action
Remarks
Piston and cylinder damage may result if pistons are not returned to
their original cylinders. Observe matchmarks so that mixups do not
occur.
15. Piston to
Insert each piston in its respective cylinder or
cylinder
replacement and measure the piston skirt-to-
clearance
cylinder clearance with feeler gage. If clear-
ance is not within 0.0012 to 0.0224 inch
(0.031 to 0.569 mm), inspect pistons and
replace if necessary.
NOTE
Each piston is fitted with three rings: two compression rings and an oil
control ring. The top compression or trapezoidal ring can be identified
by the bright chrome plating. The second compression or taper piston
ring can be identified by its cast iron construction. A two-piece oil
control ring is used in the oil ring groove. All new piston rings must be
installed whenever a piston is removed, replaced, or when a new
cylinder is installed.
6-115
