Shibaura SG280E, Руководство по ремонту

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44
N843 Standard Maintenance chart
* Numerical values for inspection items shown without units should be considered to be in units of mm.
C
a
te
g
o
ry
C
la
s
s
if
i-
c
a
ti
o
n
Inspection item
Standard
dimension
Assembly
standard
Required
repair
level
Usage
limit
Remarks
Cylinder compression pressure
Mpa (kg/cm
2
)
2.94(30) or
more
2.45(25) Engine 200rpm
Cylinder head tightening torque
N ⋅ m
98 to 102.9
Apply Molykote
grease.
Deformation in
bottom surface (installation
surface) of cylinder head
0.05 or less 0.12
Valve seat recess
0.6 to 1.2 1.8
Valve seat angle:
45 degrees
Intake
C
y
lin
d
e
r
h
e
a
d
Valve seat
contact
width
Exhaust
1.2 to 1.8
2.5 or
more
Liner format Wet type (single unit)
Inner diameter
φ 84 φ 84.0 to 84.019 φ 84.2
E
n
g
in
e
B
lo
c
k
Deformation on top surface of
cylinder block
05 or less 0.12
Skirt length φ 83.955
φ 83.948 to
83.963
φ 83.7
Clearance with cylinder 0.0040 to 0.0041 0.25
At 20 degrees
centigrade
P
is
to
n
s
Clearance between piston pin
hole and pin -0.00004 to
+0.00043
0.02
External diameter of pin φ 27 φ 27.996 to 28.0 φ 27.98
Clearance between rod small
end and pin
0.01 to 0.025 0.08 Oil clearance
P
is
to
n
p
in
s
Ring #1 0.07 to 0.11 0.25
Ring #2 0.04 to 0.08 0.25
Clearance bet-
ween piston ring
groove and ring
Oil ring 0.02 to 0.06 0.15
Ring #1 2.0 1.97 to 1.99
Ring #2 1.5 1.47 to 1.49 Ring width
Oil ring 3.0 2.97 to 2.99
Ring #1 0.20 to 0.35 1.0
Ring #2 0.20 to 0.40 1.0
P
is
to
n
r
in
g
s
Clearance
between piston
ring connection
openings
Oil ring 0.20 to 0.40 1.0
Distortion in large end and
small end holes
0.08 or less
0.2 or
more
(per 100mm)
Parallelism in large end and
small end holes
0.05 or less
0.15 or
more
(per 100mm)
Front/rear allowance in
connecting rods and crank pins
0.1 to 0.3 0.7
Clearance between
connecting rod metal and
crank pin
0.035 to 0.085 0.2 Oil clearance
Connecting rod tightening
torque (N
⋅
m)
49 to 53.9
P
ri
m
a
ry
m
o
v
in
g
p
a
rt
s
C
o
n
n
e
c
ti
n
g
r
o
d
s
Weight difference after piston
assembly (g)
10 or less
2-9 Engine standard maintenance chart