Yanmar YSE8 - Page 30

Diaassembly
1) Ring
removal
1-1 Make bi,lo
4 cm-dia. rings
of
tag
wire.
1-2 Slightly
pull
each
ring and
open with the
wires
placed
al its ends and
remove.
Excessive opening
will cause
ring breakage.
1-3 After
remola.I of all
the rings, clean the
ring
glooves,
-
2l Disassembly
o{
piston
and
connecting rod
rD
The
piston
and the connecting
rod are connected
to each
other through
the
piston pin.
The
piston pin
hole has
a
little
tigitening allo\4
ance
\lhen cold. It is
thelefore
neces-
'
sary
to heat the
piston
when it
is
lo
be talien
out
or inserteci
2-l Remove
t1'ro
piston pin
stop rings.
2-Z Heat ttlre
piston pin
for 15
min. in oil
at oil
temperalure
of
8tr
C.
2-3 Take
out the
piston
pin
using the
exclu-
sive tool.
Checking
& Sewicing
a;
Note: 1t
is recommended
that
parts
be renewed at
ma-x. allowable values,
Check
point
Remedy
ring.
using a
Thickness
YSE8
YSEI ]
No. I
ring
plated
B
2.0 0.t
5 2.5
0.15
T 3.3
,0.1J
3.7
0.37
No.2&
No.3
rings
B
_2.0 0.15
2.5
0.l5
T l.l 0.33
3.1
,o.3'7
Oil
dng
B. 4.0
0.15
4.0 0.15
T .].1
,0.33
3.1 0.3'7
Renew
iI wear
exceeds max.
auowable value
YSE8 YSEI2
No I ring
104200
-221l0
104500
-221
l0
No.2 & No.3
rings
104200
22100
loi438
-27l0o
Oil ring
104200
.22200
r03438
-22200