5. Inspection and servicing of basic engine parts
117
(3) Removing the piston pin
A floating type piston pin is used in this engine. The piston pin can be pressed into the piston pin hole at
room temperature (Coat with oil to make it slide easily).
5.3.2 Piston pin
Measure the outer diameter and replace the pin if it is
excessively worn.
Piston outside diameter.
D2
Tolerance
below + 0.005
0 min.
below 0
-0.005 min.
Size mark
ML
MS
Cylinder inside
diameter
D1
+0.030 max.
+0.020 min.
L
{
X
below
+0.020
+0.010 min.
M
{
{
below
+0.010
0 min.
S
X
{
Model
Cylinder inside diameter
D1
Piston outside diameter.
D2
3YM30
76
75.970
3YM20
70
69.975
Standard
Limit
Piston pin hole
inside dia.
22.000-22.009
22.039
Piston pin
outside dia.
21.995-22.000
21.965
Clearance
0.000-0.014
0.074
(Piston pin hole)
A
a
Measure at positions a and b
in directions A and B.
b
B
Measure at positions a, b and c
in directions A and B.
A
B
a
b
c
(Piston pin outside diameter)
Summary of Contents for 3YM20
Page 1: ...M9961 03E100 ...
