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3.
2
CYLINDER
HEAD
37
6.
Ring tension
The
piston ring tension
is
measured with a
tension
measuring
instrument.
(Fig. 3,
68)
Item
I
Standard
value
I
Serviceabl
e
limit
Top, ring
0.92-l.37kg
I
Replace if under
12.0-3.0
lbl
0 .6 kg t 1.3 tbl
Second ring
0.75-1.15
kg
I
Replace
if
under
t
1 .65-2.5
lbl
0.5
kg
t
1.l
lbl
Oil
ring
l.47-2.14kg
I
Replace
if
under
(3.2-4
.7 lbl
1.2
kg
12.6 lbl
I
7.
Ring width and
thickness.
Item
I
Standard value
'.
S~rviceab
le
limit
Wi
dth
I
A
ll
rings
3.1-3.3
mm
I
Replace
if
under
IO. l
22-
0.130
in)
2.9
mm IO.
l l
41 inl
I
1.45-l
:4
65
mm
I
Replace if under
I
Tap
I0.057-0.058
inl,
1.4
mm 10.0551 in!
I
; l.475-l.485mm
'
.
Thickness
I
2nd
I
10 0580 _
I
Replace
,
f under
·
0
_
0584
inl
1.43
mm
10.566
inl
2.48-2.495
mm
R
1
'f
d
I
O
il
IO
0976
_
1
ep
ace
, un
er
I
·
0
_
0982
inl
2.4 mm I0.0944 inl
Y.
Piston and Piston Ring
Reassembly
l.
Assemble
the
piston to the
sm
all
end
of
the
connecting
rod.
Only a slight hand pressure
should
be
required to
insert
the
piston pin.
A
lwa
ys
install
a
new piston
pin clip
.
NOTE,
a. Cover the
crankcase wi
th
a rag
to
prevent
possibility of the pin clip from
dropping
into
the
crankcase.
b.
Set
the
clip
so that the
opening
is away from
the
groove
cutout.
(Fig.
3.
70)
c. The
piston must be
assembled
so that the
"E "
stamped
on the piston
hea
J
is
toward
the
top
when the
engine is
in
the
normal attitude.
(Fig. 3. 69)
2.
Install
the
piston rings
on
the
piston
in
the
reverse order of
disassembly.
The
bot
tom
oil
ring
must
be
installed
first.
NOTE:
a. When new piston ring is
installed,
a
check
should
be made to
assu
re
that the ring
fits
freely in the groove.
This can be
done by
rolling
the piston
ring
externally
in
the piston
groove
.
(Fig. 3.
71)
CD
Fig.
3. 68
Piston ring
tension
measuring
CD
Piston
ring
®
Load
Fig.
3.
70
Shift the
cul
portion
of the
clip
from the cut
port ion
of
the clip
groove
CD
Piston pin
cl
ip
Fig. 3. 71
Turn the
rin
g around to
the piston
and check
to
c
ontact
condition
CD
Piston
ring
®
Piston
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