Shibaura N843, Workshop Manual

Page: 27 / 75

109823 2/09 3-9
Disassembly, inspection and reassembly of
bearing holder
Disassembly and inspection
Center bearing
1. Remove the bearing holder, and replace the bearing
if peeling, melting, uneven wear, or improper contact
is noticed.
2. Measure the oil clearance of the crankshaft center
journal and bearing using a plasti-gauge.
3. If the oil clearance exceeds the service limit
according to the result of the measurement, replace
the bearing and/or crank shaft.
Reassembly
Bearing holder, Center bearing
1. Install the bearing holder with identification cutting
mark at the center and the aluminum bearing holder
on the flywheel side, facing the stepped side to the
front side.
2. Install the bearing with oil groove to the upper side
and the one without oil groove to the lower side.
Note: Be sure that the oil holes of the bearing
holder and cylinder block are aligned.
Crankshaft bearing (bushing)
Clearance between crankshaft center journal and
bearing (Oil clearance) in(mm)
Standard assembling value Service limit
0.0012-0.0036
(0.03-0.092)
More than 0.008(0.2)
Bearing
size
Bearing part No. Crankshaft center
journal finishing
dia ø in(mm)
STD 198517572 (upper)
198517582 (lower)
1.8883-1.8888
(47.964– 47.975)
Bearing holder tightening
torque
14-17.5 lb
f
•ft(20–25 Nm)
{2.0–2.5 kgfm}
Fig. 3-25
Bearing holder (Upper)
Upper Bearing
(with oil groove)
Oil groove
Upper Bearing
(without oil groove)
Bearing holder (Lower)
Cutting mark
Stepped side