Shibaura ST318, Руководство по ремонту

Страница: 45 / 247

44
8) Crankshaft bearing (bush)
Inspection
(1) Check the bearing (bush) and replace if peeling,
melting, uneven wear, 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)
or grind the crankshaft journal according to paragraph
9) and replace with a bearing (bush) of undersize.
Clearance between crankshaft journal and bearing
(bush) (oil clearance) (mm)
Model
Standard
assembling value
Service limit
S753
·
S773
·
S773L
0.039 – 0.106 More than 0.2
T131 T132
Model Bush size
Bush code
No.
Crankshaft journal outside
dia. Finishing dimension
(
∅ )
S753
·
S773
STD. 198517080 45.964 – 45.975
U.S. 0.25 198517084 45.714 – 45.725
U.S. 0.50 198517087 45.464 – 45.475
S773L
STD. 198517590 47.975 – 47.964
U.S. 0.25 198517594 47.725 – 47.714
U.S. 0.50 198517597 47.475 – 47.464
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.
T133