Yamaha F115A - Page 278

5-42
POWR
E
2. Adjust:
• Main-bearing oil clearance
NOTE:
Adjust the main-bearing oil clearance at
room temperature (20˚C (68 ˚F)).
Adjusting steps
CAUTION:
Remove any oil or dust from the cylinder
block and crankcase bearing mounting sur-
faces.
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
(1) Subtract the crankshaft journal diame-
ters (#1 - #5) from the cylinder block
journal diameters (#1 - #5).
(2) 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)
5550
#1
#2
#3
#4
#5
5560
5570
CRANKSHAFT AND PISTON/
CONNECTING ROD ASSEMBLY