Yamaha F200B, Руководство по обслуживанию

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7-86
7
Checking the piston diameter
1. Measure the piston diameter
a
at the
specified measuring point
b
.
Checking the cylinder bore
1. Measure the cylinder bore (D
1
–D
6
) at
measuring points
a
,
b
, and
c
, and in
direction
d
(D
1
, D
3
, D
5
), which is parallel
to the crankshaft, and direction
e
(D
2
,
D
4
, D
6
), which is at a right angle to the
crankshaft.
a
20 mm (0.8 in)
b
50 mm (2.0 in)
c
80 mm (3.1 in)
Checking the piston ring
1. Check the piston ring dimensions B and
T.
Checking the piston ring end gap
(reference)
1. Level the piston ring
1
in the cylinder
using a piston crown at the specified
measuring point
a
.
2. Measure the piston ring end gap
b
.
Water
temperature
Valve opening
a
58–62 °C
(136–144 °F)
Starts opening
above 70 °C
(158 °F)
4.3 mm (0.17 in) or above
Piston diameter
a
:
93.921–93.941 mm (3.6977–3.6985
in)
Measuring point
b
:
13.500 mm (0.5315 in) up from the
bottom of the piston skirt
b
a
D
1
D
2
D
3
D
4
D
5
D
6
a
b
c
d
e
Cylinder bore (D
1
–D
6
):
94.000–94.017 mm (3.7008–3.7014
in)
Piston ring dimensions:
Top ring
a
:
B: 1.200 mm (0.0472 in)
T: 2.800–3.000 mm (0.1102–0.1181 in)
Second ring
b
:
B: 1.170–1.190 mm (0.0461–0.0469 in)
T: 3.700–3.900 mm (0.1457–0.1535 in)
Oil ring
c
:
B: 2.400–2.470 mm (0.0945–0.0972 in)
T: 2.300–2.700 mm (0.0906–0.1063 in)
T
B
T
T
B
B
a b
c
b
a
1
Cylinder block