Yamaha YZFR1W, Руководство по обслуживанию

Страница: 273 / 429

CRANKSHAFT
5-73
2. Install:
• Piston ring
(into the cylinder)
NOTE:
Level the piston ring into the cylinder with the
piston crown.
3. Measure:
• Piston ring end gap
Out of specification
→
Replace the piston
ring.
NOTE:
The oil ring expander spacer’s end gap cannot
be measured. If the oil ring rail’s gap is exces-
sive, replace all three piston rings.
EAS24440
CHECKING THE PISTON PIN
1. Check:
• Piston pin
Blue discoloration/grooves
→
Replace the
piston pin and then check the lubrication
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 piston.
Piston ring side clearance
Top ring
0.030–0.065 mm (0.0012–
0.0026 in)
Limit
0.115 mm (0.0045 in)
2nd ring
0.020–0.055 mm (0.0008–
0.0022 in)
Limit
0.115 mm (0.0045 in)
a. 5 mm (0.20 in)
Piston ring end gap
Top ring
0.15–0.25 mm (0.0059–0.0098
in)
Limit
0.50 mm (0.0197 in)
2nd ring
0.30–0.45 mm (0.0118–0.0177
in)
Limit
0.80 mm (0.0315 in)
Oil ring
0.10–0.40 mm (0.0039–0.0157
in)
Piston pin outside diameter
16.991–17.000 mm (0.6689–
0.6693 in)
Limit
16.971 mm (0.6682 in)
Piston pin bore inside diameter
17.002–17.013 mm (0.6694–
0.6698 in)
Limit
17.043 mm (0.6710 in)