Shibaura ST318, Workshop Manual

Page: 94 / 247

93
S773L ENGINE (ST324)
* Unit for values without unit in the column of inspection item is mm.
Unit Part Inspection Items
Standard
Dimension
Standard Value To be Repaired
Allowable
Limit
Remarks
Compression pressure of cylinder
MPa (kgf/cm
2
)
More than 2.94
(More than 30)
Less than 2.45
(Less than 25)
Engine 200
rpm
Distortion of face of cylinder head Less than 0.05 More than 0.12
T220
0.85 – 1.15 1.8
Valve sheet
angle 45
°
Width of valve seat (intake/exhaust) 1.7 – 2.1 More than 2.5
Tightening torque of cylinder head
N
⋅
m (kgf
⋅
m)
49 ~ 52
(5.0 – 5.3)
Coat threads
with
molybdenum
bisulfulde
based grease.
Bore
∅
77
∅
77.99 – 77.005
∅
77.2
Over size
(0.5)
Distortion of upper face of cylinder
block
Less than 0.05 0.12
Skirt diameter (longer diameter)
∅
77
∅
77.9225 –
77.9375
Over size
(0.5)
Clearance to cylinder
∅
0.0525 – 0.0865 0.25 At 20
°
C
Inside diameter of piston pin hole
∅
21
∅
20.998 – 21.002
21.016
Piston pin hole-to-pin clearance -0.004 - +0.004 0.02
Outer diameter of pin
∅
21
∅
20.998 – 21.002
∅
20.98
Small end bush-to-pin clearance 0.008 – 0.023 0.08 Oil clearance
Piston ring gap: No.1 ring 0.15 – 0.27
1.0 No.2 ring 0.12 – 0.24
Oil ring 0.2 – 0.35
Piston ring
groove-to-ring
clearance No.1 ring 0.06 – 0.1
0.25
No.2 ring 0.05 – 0.09
Oil ring 0.02 – 0.06 0.15
Ring width No.1 ring 2 1.97 – 1.99
Over size
(0.5)
No.2 ring 1.5 1.47 – 1.49
Oil ring 4 3.97 – 3.99
MA
IN
MOVI
NG
S
Y
ST
EM
ENGI
NE
CYLINDER HE
A
D
CYL
INDER
BL
OCK
PIST
ON
PI
S
T
ON
PI
N
PIST
ON RI
NG