Yamaha 2005 MT-01, Руководство по обслуживанию

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CYLINDERS AND PISTONS
5-44
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 PINS
The following procedure applies to all of the pis-
ton 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 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.
EAS24460
INSTALLING THE PISTONS AND
CYLINDERS
The following procedure applies to all of the pis-
tons and cylinders.
1. Install:
• Top ring “1”
• 2nd ring “2”
• Lower oil ring rail “3”
• Upper oil ring rail “4”
• Oil ring expander “5”
NOTE:
Be sure to install the piston rings so that the
manufacturer’s marks or numbers face up.
Piston ring
Top ring
End gap (installed)
0.30–0.50 mm (0.01–0.02 in)
Limit
0.70 mm (0.0276 in)
2nd ring
End gap (installed)
0.30–0.45 mm (0.01–0.02 in)
Limit
0.80 mm (0.0315 in)
Oil ring
End gap (installed)
0.20–0.70 mm (0.01–0.03 in)
Piston pin outside diameter
21.991–22.000 mm (0.8658–
0.8661 in)
Limit
21.971 mm (0.8650 in)
Piston pin bore inside diameter
22.004–22.015 mm (0.8663–
0.8667 in)
Limit
22.045 mm (0.8679 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
0.004–0.024 mm (0.00016–
0.00094 in)
Limit
0.074 mm (0.00291 in)