Yamaha e60hwd, Руководство по обслуживанию

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69D5G11 5-34
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Crankcase
Checking the piston diameter
1. Measure the piston outside diameter at
the specified measuring point. Replace if
out of specification.
Checking the piston clearance
1. Calculate the piston clearance using the
piston outside diameter and the cylinder
bore specifications. Replace the piston
and piston rings as a set or the cylinder
block or all parts, or rebore the cylinder if
out of specification.
Checking the piston rings
1. Check the piston ring dimensions of B
and T. Replace if out of specification.
2. Level the piston rings
1
in a cylinder with
a piston crown.
3. Check the piston ring end gap
a
at the
specified measuring point. Replace if out
of specification.
T
B
69D50410
Piston outside diameter:
71.940—71.965 mm
(2.8323—2.8333 in)
Measuring point
a
:
10.0 mm (0.39 in) up from the
bottom of the piston skirt.
Oversize piston diameter:
1st:
72.190—7.215 mm
(2.8421—2.8431 in)
2nd:
72.440—72.465 mm
(2.8520—2.8529 in)
Piston clearance:
0.055–0.060 mm
(0.0022–0.0024 in)
Piston ring dimensions
Top ring and 2nd piston ring:
B: 1.970—1.990 mm
(0.0776—0.0783 in)
T: 2.900—3.100 mm
(0.1142—0.1220 in)
6F650430
b
a
1
1
Piston ring end gap
a
:
Top ring and 2nd piston ring:
0.30—0.50 mm
(0.0118—0.0197 in)
Measuring point
b
:
10.0 mm (0.39 in)
69D5G11_05_1 06.10.16 13:51 Page 35