Shibaura ST318, Workshop Manual

Page: 44 / 247

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7) Disassembly, inspection and reassembly of bearing holder
Disassembly and inspection
Center bearing
(1) Remove the bearing holder, and replace the metal if
peeling, melting, uneven wear, or improper contact is
noticed.
(2) Measure the oil clearance of the crankshaft center
journal and metal using a plasti-gauge.
(3) If the oil clearance exceeds the service limit according
to the result of the measurement, replace the metal or
grind the crankshaft center journal according to
paragraph 9) and replace with a metal of undersize.
Clearance between crankshaft center journal and metal
(oil clearance) (mm)
Model
Standard
assembling value
Service limit
S753
·
S773
·
S773L
0.039 – 0.092 More than 0.2
Rear bearing holder
Check the bearing holder and replace if wear, improper
contact, seizure, or other damage is noticed, or thickness
exceeds the service limit.
Rear bearing holder thickness (mm)
Model
Standard
assembling value
Service limit
S753
·
S773
·
S773L
21.85 – 21.95 21.55
Reassembly (bearing holder, center bearing,
thrust washer)
(1) Install the bearing holder with identification cutting
mark at the center and the bearing holder with thrust
washer to the flywheel side, facing the chamfered side
frontward.
(2) Install the thrust washer facing the oil groove to the
crankshaft thrust surface.
Bearing holder tightening torque
(Made of aluminium die cast only)
20 – 25 N · m
(2.0 – 2.5 kgf · m)
(3) Install the metal with oil groove to the upper side and
the one without oil groove to the lower side.
NOTE: Be sure to confirm that the oil holes of the
bearing holder and block are aligned.
Model S753 · S773
Metal size Metal code No.
Crankshaft center
journal finishing
dimension (
ø
)
STD.
198517101 (upper)
198517110 (lower)
45.964 – 45.975
U.S. 0.25
198517105 (upper)
198517114 (lower)
45.714 – 45.725
U.S. 0.50
198517108 (upper)
198517117 (lower)
45.464 – 45.475
Model S773L
Metal size Metal code No.
Crankshaft center
journal finishing
dimension (
ø
)
STD.
198517570 (upper)
198517580 (lower)
47.975 – 47.964
U.S. 0.25
198517574 (upper)
198517584 (lower)
47.725 – 47.714
U.S. 0.50
198517577 (upper)
198517587 (lower)
47.475 – 47.464
T129
T130