Главная Manuals Yamaha YF70GG, YF70GPG, YF70GPSG, YF70GPLG, YFM70GDXG, YFM70GDHG, YFM70GPXG, YFM70GPHG, YFM70GPSG, YFM70GPLG, YFM700FWAD. Service manual (2016)
|
|
|
-------------------------------------------------------------------------------------------------------------------------------------------------------------
CYLINDER HEAD, CYLINDER, AND PISTON
b. If out of specification, replace the cylinder,
Top ring
and replace the piston and piston rings as a
Ring side clearance limit
set.
0.12 mm (0.0047 in)
c. Measure piston skirt diameter “P” with a mi-
2nd ring
crometer.
Ring side clearance limit
0.12 mm (0.0047 in)
Diameter
102.960-102.975 mm (4.0535-
4.0541 in)
a
P
2. Install:
• Piston ring
(into the cylinder)
a.
11.0 mm (0.43 in) from the bottom edge of the
piston
TIP
Use the piston crown to level the piston ring near
d. If out of specification, replace the piston and
bottom of cylinder “a”, where cylinder wear is
piston rings as a set.
lowest.
e. Calculate the piston-to-cylinder clearance
with the following formula.
• Piston-to-cylinder clearance =
a
Cylinder bore “C” -
Piston skirt diameter “P”
Piston-to-cylinder clearance
0.040-0.075 mm (0.0016-0.0030
in)
b
f. If out of specification, replace the cylinder,
and replace the piston and piston rings as a
b. Upper of cylinder
set.
3. Measure:
▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
• Piston ring end gap
EBS30148
Out of specification → Replace the piston
CHECKING THE PISTON RINGS
ring.
1. Measure:
• Piston ring side clearance
TIP
Out of specification → Replace the piston
The oil ring expander end gap cannot be mea-
and piston rings as a set.
sured. If the oil ring rail gap is excessive, replace
TIP
all three piston rings.
Before measuring the piston ring side clearance,
eliminate any carbon deposits from the piston
ring grooves and piston rings.
5-24
|