5-41
POWR
E
CRANKSHAFT AND PISTON/
CONNECTING ROD ASSY.
2. Adjust:
● Main-bearing oil clearance
NOTE:
Adjust the main-bearing oil clearance at
room temperature (20˚C (68 ˚F)).
Adjusting steps:
● Subtract the crankshaft journal diame-
ters (#1 ~ #5) from the cylinder block
journal diameters (#1 ~ #5).
● Select the suitable bearing from the
table below according to the calcu-
lated values.
Crankshaft bearing selection table
(20 ˚C (68 ˚F))
Cylinder block
journal diameters –
crankshaft journal
diameters (mm)
Bearing
(cylinder side)/
thrust bearing
Bearing
(crankcase
side)
6.023 ~ 6.026
6.027 ~ 6.034
6.035 ~ 6.042
6.043 ~ 6.049
6.050 ~ 6.058
Green
Blue
Blue
Red
Red
Yellow*
Green*
Blue
Blue*
Red
(#1)
(#2)
(#3)
(#4)
(#5)
#1
#2
#3
#4
#5
CAUTION:
Remove any oil or dust from the cylinder
block and crankcase bearing mounting
surfaces.
NOTE:
The cylinder block journal diameters (#1 ~
#5) and the crankshaft journal diameters,
(#1 ~ #5) can be determined by the
stamped value as described below.
Crankshaft journal diameter = 47.900 +
(stamped value/1000)
Example: #1 = 92 → 47.992
Cylinder block journal diameter = 54.000
+ (stamped value/1000)
Example: #1 = 32 → 54.032
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