Shibaura ST330, Workshop Manual

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64
2-5 Engine Maintenance Standards Table
N843 ENGINE
* 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
Cylinder head tightening torque
N ･ m {kgf ・ m}
98
－
103
{10.0 － 10.5}
Coat threads
with engine
oil.
Distortion of face of cylinder head Less than 0.05 0.12
184Y
0.85 – 1.15 1.8
Valve sheet
angle 45
°
Width of valve seat
Intake
1.66 － 1.87
2.5
Exhaust
1.66 － 1.73
2.5
Bore
∅
84
∅
84 – 84.019
∅
84.2
Distortion of upper face of cylinder
block
Less than 0.05 0.12
Skirt diameter (longer diameter)
∅
83.955
∅
83.948 －
83.963
∅
83.7
Clearance to cylinder 0.038 – 0.072 0.25 At 20
°
C
Clearance between piston pin hole
and pin
-0.001 – +0.007 0.02
Outer diameter of pin
∅
27.996 – 28.0
∅
27.98
Small end bush-to-pin clearance 0.010 – 0.025 0.08
Oil
clearance
Piston ring gap: No.1 ring 0.20 – 0.35
1.0
No.2 ring 0.20 – 0.40
Oil ring 0.20 – 0.8 1.2
Piston ring
groove-to-ring
clearance No.1 ring 0.07 – 0.11
0.25
No.2 ring 0.04 – 0.08
Oil ring 0.02 – 0.06 0.15
Ring width No.1 ring 2
No.2 ring 1.5
Oil ring 4
MAIN
MOVI
NG
SY
ST
EM
ENGI
E
CY
L
IND
ER
HE
AD
PISTON
PI
ST
O
N
PI
ST
ON RI
NG
C
Y
LIN
D
ER
B
L
OC
K