14
⑥
Requirement of connecting rod bearing matching group is in the table below:
Piston pin matching relation
Matching
group
number
Connecting rod small
end
A B
C
Piston pin
A
B
C
Piston pin boss hole
A
B
C
⑦
Requirement of connecting rod big end matching group is in the table below
：
Group and mark
Connecting rod big end dimension
（
Ф
43
0
+0.024
）
4
≥
0
≤
+ 0.008
5
＞
+0.008
≤
+0.016
6
＞
+0.016
≤
+0.024
⑧
Requirement of connecting rod bearing matching group is in the table below
：
Connecting rod bearing matching group
Group and mark
Identifying color
Center thickness
（
1.5
+0.006
–0.014
）
1
Yellow
≥
－
0.014
≤
+0.010
2
Green
＞－
0.010
≤
－
0.006
3
Brown
＞－
0.006
≤
－
0.002
4
Blake
＞－
0.002
≤
+0.002
5
Blue
＞
+0.002
≤
+0.006
⑨
Connecting rod matching relation is in the table below
：
Connecting rod matching relation
Connecting rod neck group number
connecting rod
matching group
1 2 3
4 3
2
1
5 4
3
2
Connecting rod
big end group
number
6 5
4
3
Note:
(1) Connecting rod bearing matching group number=connecting rod big end matching
group number-connecting rod neck matching group number
。
(2) Upper and lower connecting rod should be fitted with the same group bearing
。
B. When installing two gas ring and the combined oil ring into grooves of piston. Stagger their
opening (fig.3-9). The marked surface of the first and second rings should face piston head
C .Main points for installing piston and connecting rod assembly. There are fitting marks on
piston head and connecting rod shank. Sure that the mark s are in the same direction (refer to
fig.3-10) .Be careful to avoid mistakes.
