Yamaha F100B, Service Manual

Page: 138 / 345

POWR
Power unit
5-45
60C5D11
3. Check the crank pin mark on the crank-
shaft
2
.
4. Select the suitable color
b
for the con-
necting rod bearing from the table.
5. Subtract the crank pin diameters (#1–#4)
from the connecting rod big end diame-
ters (#1–#4).
NOTE:
The crank pin diameters (#1–#4) can be
determined by the stamped value as
described below.
Crank pin diameter = 43.900 + (stamped
value/1,000)
Example: #1 = 92
→
43.992
6. Select the suitable bearing from the table
below according to the calculated values.
CAUTION:
The (*) mark indicates that the color of the
upper and lower bearings are different.
7. If the measurement value is more than
the maximum value (3.063 mm), replace
the crankshaft, connecting rod, or both.
Checking the crankshaft main
journal oil clearance
1. Clean the bearings, main journals, and
bearing portions of the crankcase and
cylinder body.
2. Place the cylinder body upside down on
a bench.
(#1)
(#2)
(#3)
S60C5A45
(#4)
S60C5A65
Connecting rod bearing selection table
(20 °C [68 °F])
Connecting rod big
end diameters –
crank pin
diameters (mm)
Upper
bearing
Lower
bearing
3.025–3.027 Yellow Yellow
3.028–3.034 Yellow Green*
3.035–3.041 Green Green
3.042–3.049 Green Blue*
3.050–3.057 Blue Blue
3.058–3.063 Blue Red*