Yamaha TMAX XP500F 2015, Руководство по обслуживанию, Страница: 271 / 478

CYLINDER AND PISTONS
5-34
EAS30293
CHECKING THE PISTON PINS
The following procedure applies to both of the
piston pins.
1. Check:
• Piston pin
Blue discoloration/grooves
→
Replace the
piston pin and then check the lubrication sys-
tem.
2. Measure:
• Piston pin outside diameter “a”
Out of specification
→
Replace the piston pin.
3. Measure:
• Piston pin bore inside diameter “b”
Out of specification
→
Replace the piston.
4. Calculate:
• Piston-pin-to-piston-pin-bore clearance
Out of specification
→
Replace the piston pin
and piston as a set.
EAS30294
INSTALLING THE PISTON AND CYLINDER
The following procedure applies to all of the pis-
tons and cylinders.
1. Install:
• Oil ring expander “1”
• Lower oil ring rail “2”
• Upper oil ring rail “3”
• 2nd ring “4”
• Top ring “5”
(into the piston)
Piston ring
Top ring
End gap (installed)
0.25–0.35 mm (0.0098–0.0138
in)
Limit
0.60 mm (0.0236 in)
2nd ring
End gap (installed)
0.35–0.50 mm (0.0138–0.0197
in)
Limit
0.75 mm (0.0295 in)
Oil ring
End gap (installed)
0.10–0.35 mm (0.0039–0.0138
in)
a. Bottom of cylinder
b. Upper of cylinder
Piston pin outside diameter
15.991–16.000 mm (0.6296–
0.6299 in)
Limit
15.971 mm (0.6288 in)
a
b
Piston pin bore inside diameter
16.002–16.013 mm (0.6300–
0.6304 in)
Limit
16.043 mm (0.6316 in)
Piston-pin-to-piston-pin-bore clearance =
Piston pin bore inside diameter -
Piston pin outside diameter
Piston-pin-to-piston-pin-bore
clearance
0.002–0.022 mm (0.0001–0.0009
in)