5. Inspection and Servicing of Basic Engine Parts
105
(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.
5.3.3 Piston rings
There are 2 compression rings and 1 oil ring.
The absence of an oil ring on the piston skirt prevents
oil from being kept on the thrust surface and in turn
provides good lubrication
Standard
Limit
Piston pin hole
inside dia.
Ø26.000-26.009
Ø26.020
Piston pin
outside dia.
Ø25.995-26.000
Ø25.965
Clearance
0-0.014
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)
(Ring components)
Top ring
Oil ring
Second ring
