TM 5-3805-280-24-2
Cylinder Block, Liners, Pistons and Rods
INSTALL PISTON RINGS
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IMPORTANT: Piston rings can be damaged if
expanded too far. Expand piston rings
only as far as necessary to install rings
on piston.
1. When installing new piston rings, use JDE85, JDE135,
or KJD10140 Piston Ring Expander. Install oil ring
expander in bottom ring groove. Position end gap
toward either side of piston pin.
2. Install oil control ring (C) in bottom ring groove over
ring expander. Install with end gap on opposite side of
piston from ring expander gap.
NOTE: If standard-duty top piston ring is used, identify
top as follows: hold ring with gap facing you and
turn ring so that paint strip is to the left side of
gap.
If heavy-duty top ring is used, the "pip" mark
should be on top as shown (A).
3. Identify top side of compression rings. Top side of
rectangular and keystone compression rings will be
identified by depression marks (A) on the top side of
two rings.
NOTE: Rectangular compression ring with two depression
marks goes in the second groove.
4. Install rectangular compression ring (B) in center ring
groove with top of ring toward top of piston.
5. Position gap in rectangular compression ring on
opposite side of piston from oil control ring (C) gap.
6. Install keystone compression ring (D) in top ring groove
A--Depression Marks
with top of ring toward top of piston.
B--Rectangular Compression Ring
C--Oil Control Ring
7. Position gap in Keystone compression ring on opposite
D--Keystone Compression Ring
side of piston from rectangular compression ring gap.
Continued on next page
RG,10,DT7388 1911NOV971/2
13-170
