Yanmar YSE8 Service Manual 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 . 1 5
T 3.3
,0.1J 3.7
0.37
N o . 2 &
No.3 rings
B _2.0
0 . 1 5 2.5 0 . l 5
T
l . l
0.33 3 . 1
,o.3'7
Oil dng
B . 4.0
0 . 1 5 4.0 0 . 1 5
T .].1
,0.33 3 . 1
0.3'7
Renew iI wear exceeds max. auowable value
YSE8
Y S E I 2
No I ring
104200
- 2 2 1 l 0
104500
- 2 2 1 l 0
N o . 2 & N o . 3
rings
104200
2 2 1 0 0
loi438
-27l0o
Oil ring
104200
.22200
r03438
-22200