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5-37
CYLINDER AND PISTONS
ENG
a
b
EAS00266
CHECKING THE PISTON PINS
The following procedure applies to all of the pis-
ton pins.
1. Check:
S
piston pin
Blue discoloration / grooves
!
Replace the
piston pin and then check the lubrication sys-
tem.
2. Measure:
S
piston pin outside diameter
a
Out of specification
!
Replace the piston
pin.
Piston pin outside diameter
20.991
X
21.000 mm
<Limit>: 20.971 mm
3. Measure:
S
piston pin bore diameter (in the piston)
b
Out of specification
!
Replace the piston.
Piston pin bore diameter
(in the piston)
21.004
X
21.015 mm
<Limit>: 21.045 mm
4. Calculate:
S
piston-pin-to-piston-pin-bore clearance
Out of specification
!
Replace the piston pin
and piston as a set.
Piston-pin-to-piston clearance =
Piston pin bore diameter
–
Piston pin outside diameter
Piston-pin-to-piston clearance
0.004
X
0.024 mm
<Limit>: 0.074 mm