SELVA MARINE Kingfish 25, Руководство по обслуживанию

Страница: 205 / 398

7-57
POWR
Power unit
6. Remove the piston pin clips
B
and pis-
ton pin
C
, and then remove the connect-
ing rod
c
.
TIP:
Make sure to keep the parts in the order as
they were removed.
7. Remove the piston rings.
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 in direction
e
(D
2
,
D
4
, D
6
), which is at a right angle to the
crankshaft.
a
10.0 mm (0.39 in)
b
48.0 mm (1.89 in)
c
85.0 mm (3.35 in)
Checking the piston ring
1. Measure the piston ring dimensions B
and T.
Piston diameter
a
:
64.950–64.965 mm (2.5571–2.5577 in)
Measuring point
b
:
5.0 mm (0.20 in) up from the bottom of
the piston skirt
Oversize piston diameter:
Oversize 1st:
65.200–65.215 mm (2.5669–2.5675 in)
Oversize 2nd:
65.450–65.465 mm (2.5768–2.5774 in)
c
B
B
C
b
a
Cylinder bore (D
1
–D
6
):
65.000–65.015 mm (2.5591–2.5596 in)
Piston ring dimensions:
Top ring
a
:
B: 1.170–1.190 mm (0.0461–0.0469 in)
T: 2.300–2.500 mm (0.0906–0.0984 in)
2nd ring
b
:
B: 1.470–1.490 mm (0.0579–0.0587 in)
T: 2.600–2.800 mm (0.1024–0.1102 in)
Oil ring
c
:
B: 2.360–2.480 mm (0.0929–0.0976 in)
T: 2.750 mm (0.1083 in) (reference
data)
D
1
D
2
D
3
D
4
D
5
D
6
a
b
c
d
e
c
B
T
T
B
b a
T
B