5. Inspection and servicing of basic engine parts
117R1
(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
Tol er a n c e
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.
SX{
Model Cylinder inside diameter
D1
Piston outside diameter.
D2
3YM30 76 75.970
3YM20/2YM15 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
ab c
(Piston pin outside diameter)
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