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CYLINDER AND PISTON
5-27
EAS24440
CHECKING THE PISTON PIN
1. Check:
• Piston pin
Blue discoloration/grooves → Replace
the piston pin and then check the lubrica-
tion system.
2. Measure:
• Piston pin outside diameter “a”
Out of specification → Replace the piston
pin.
3. Measure:
• Piston pin bore diameter “b”
Out of specification → Replace the pis-
ton.
4. Calculate:
• Piston-pin-to-piston-pin-bore clearance
Out of specification → Replace the piston
pin and piston as a set.
EAS24450
INSTALLING THE PISTON AND CYLINDER
1. Install:
• Lower oil ring rail “1”
• Oil ring expander “2”
Piston ring
Top ring
End gap (installed)
0.19–0.31 mm (0.007–0.012 in)
Limit
0.56 mm (0.022 in)
2nd ring
End gap (installed)
0.30–0.45 mm (0.012–0.018 in)
Limit
0.80 mm (0.032 in)
Oil ring
End gap (installed)
0.10–0.35 mm (0.004–0.014 in)
a. 40 mm (1.476 in)
Piston pin outside diameter
16.991–17.000 mm (0.6689–
0.6693 in)
Limit
16.971 mm (0.6681 in)
Piston pin bore inside diameter
17.002–17.013 mm (0.6694–
0.6698 in)
Limit
17.043 mm (0.6710 in)
• Piston-pin-to-piston-pin-bore clearance =
Piston pin bore diameter “b” -
Piston pin outside diameter “a”
Piston-pin-to-piston-pin-bore
clearance
0.002–0.022 mm (0.0001–
0.0009 in)
Limit
0.072 mm (0.0028 in)