Shibaura N843, Workshop Manual

Page: 70 / 75

7
-2
1
0
9
8
23 2/09
Ro
ta
ti
n
g As
sembly
Piston Pin
Piston pin outside dia. .8266–0.8568
(20.996–21.002)
1.1021–1.1024
(27.994–28.0)
0.8260
(20.98)
1.1012
(27.97)
Clearance between small end
bush and piston pin
0.0003–0.0010
(0.008–0.025)
0.0004–0.0011
(0.010–0.027)
0.0003
(0.08)
0.0003
(0.08)
Oil clearance
Pist
on Ring
Piston ring end
gap:
Top ring .0079–0.0138
(0.20–0.35)
0.0079–0.0138
(0.20–0.35)
0.0394
(1.0)
0.0394
(1.0)
2nd ring 0.0079–0.0138
(0.20–0.35)
0.0079–0.0157
(0.20–0.40)
0.0394
(1.0)
Oil ring 0.0059–0.0138
(0.15–0.35)
0.0098–0.0197
(0.25–0.50)
0.0394
(1.0)
0.0472
(1.2)
Clearance
between piston
ring groove and
ring
Top ring 0.0031–0.0047
(0.08–0.12)
0.0028–0.0043
(0.07–0.11)
0.0010
(0.25)
0.010
(0.25)
2nd ring 0.0020–0.0040
(0.05–0.09)
0.0016–0.0031
(0.04–0.08)
Oil ring 0.0008–0.0024
(0.02–0.06)
0.0008–0.0024
(0.02–0.06)
0.0060
(0.15)
Ring width Top ring 0.079(2) 0.079(2)
2nd ring 0.059(1.5) 0.059(1.5)
Oil ring 0.118(3) 0.157(4)
Con
n
ec
ting Rods
Torsion between small and
large end holes (per 3.937 in
(100 mm))
Less than
0.003(0.08)
Less than
0.003(0.08)
More than
0.0080(0.2)
Parallelism between small
and large end hole (per 3.937
in (100 mm))
Less than
0.0020(0.05)
Less than
0.0020(0.05)
More than
0.0059(0.15)
Axial play of connecting rod
and crank pin
0.0039–0.0118
(0.1–0.3)
0.0039–0.0118
(0.1–0.3)
0.0276
(0.7)
0.0276
(0.7)
Clearance between crank pin
and connecting rod metal
0.0014–0.0033
(0.035–0.085)
0.0014–0.0033
(0.035–0.085)
0.008
(0.2)
0.008
(0.2)
Oil clearance
Connecting rod tightening
torque
lb
f
•ft(N•m) {kgf•m}
21.4–25.1(29–34)
{3.0–3.5}
36.1–39.8(49–54)
{5.0–5.5}
Unit Part Inspection Items
Standard Dimension Standard Value
To be
Repaired
Allowable Limit
S773L N843(L) S773L N843(L) S773L N843(L) Remarks