Shibaura CM284, Workshop Manual

Page: 76 / 219

75
2-5 Engine Maintenance Standard Table
1. J843
* Unit for values without unit in the column of inspection item is mm.
Part Inspection Items
Standard
Dimension
Standard
Assembling Value
Repair Value
Service
Limit
Remarks
Cy
linder
hea
d
Cylinder compression pressure
MPa {kgf/cm
2
}
More than 2.94
{30}
2.45 {25}
Engine speed
at 200 rpm
Cylinder head tightening torque
N
⋅
m {kgf
⋅
m}
98 – 103
{10.0 – 10.5}
Coat
Molycoat
grease.
Distortion of cylinder head bottom surface
(mounting surface)
Less than 0.05 0.12
Valve seat recess (intake/exhaust)
137X
0.85 – 1.15 1.8
Valve sheet
angle 45
°
Valve seat contact width
Intake 1.66 – 1.87 2.5
Exhaust 1.66 – 1.73 2.5
Cylin
der
block
Bore φ 84 φ 84 – 84.019 φ 84.2 φ 84.2
Distortion on cylinder block top surface Less than 0.05 0.12
Pi
st
on
Longer dia. at skirt φ 83.955
φ 83.9475 –
83.96
φ 83.7
Clearance to cylinder 0.0375 – 0.0715 0.25 At 20
°
C
Clearance between piston pin hole and pin -0.010 – +0.007 0.02
Piston
pi
n
Pin outside dia.
φ
25
φ 24.996 –
25.0
φ
24.98
Clearance between rod small end bush and pin.
0.010 –
0.025
0.08 Oil clearance
Piston ring
Clearance between
piston ring groove and
ring Top ring 0.07 – 0.11
0.25
2nd ring 0.04 – 0.08
Oil ring 0.03 – 0.13 0.25
Ring width
Top ring 2
2nd ring 1.5
Oil ring 4
Piston ring end gap
Top ring 0.20 – 0.35 1.0
2nd ring 0.20 – 0.40 1.0
Oil ring 0.20 – 0.80 1.2
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