Shibaura ST330, Workshop Manual

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41
8) Crankshaft bearing (bush)
Inspection
(1) Check the bearing (bush) and replace if peeling, melting,
uneven wears, improper contact, or other damage is
notice.
(2) Measure the oil clearance of the bearing (bush) and
crankshaft journal using a cylinder gauge and micrometer.
(3) If the oil clearance exceeds the service limit according to
the result of measurement, replace the bearing (bush)
and/or crankshaft.
Clearance between crankshaft journal and bearing
(bush) (oil clearance) (mm)
Model
Standard
assembling value
Service limit
N843
0.044 － 0.116 0.2
131Y
NOTE:
1. Measure the dimensions in the A and B directions
at the position 1 and 2 in the right figure avoiding
the oil hole of the bearing (bush) and calculate
difference from the maximum value of the
crankshaft journal (oil clearance).
2. When replacing the bush, push it up using a press
or the like. At this time, align the oil holes and push
it up until the bush end surface becomes level with
the outside machined surface of the cylinder block
(see the arrow mark in the right figure).
3. When the crankshaft journal is ground, confirm
the oil clearance before reinstalling it. 132Y
Model
Bush
size
Bush code
No.
Crankshaft journal
outside dia. Finishing
dimension (
∅
)
N843 STD. 198517222 67.957
－
67.970