Yamaha F100B - Assembling the Cylinder Body

60C5D11
5-48
1
2
3
4
5
6
7
8
9
5. 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 differ-
ent.
• Be sure to install the main bearings in
the middle of the cylinder body and
crankcase journal so they do not block
the oil holes.
NOTE:
Crankshaft bearing #3 is a thrust bearing.
6. If the difference between the cylinder
body journal diameter and crankshaft
journal diameter is more than the maxi-
mum value (6.058 mm), replace the
crankshaft.
Assembling the cylinder body
1. Install the oil ring
1
, second ring
2
, and
top ring
3
to the piston with the “T” mark
a
on the piston rings facing upward.
2. Offset the piston ring end gaps as
shown.
CAUTION:
Do not scratch the piston or break the pis-
ton rings.
NOTE:
After installing the piston rings, check that
they move smoothly.
3. Install the upper half of the bearing into
the connecting rod
4
and the lower half
into the connecting rod cap
5
.
Crankshaft bearing selection table
(20 °C [68 °F])
Cylinder body
journal diameters –
crankshaft journal
diameters (mm)
Bearing
(cylinder
side)/thrust
bearing
Bearing
(crankcase
side)
6.023–6.026 Green Yellow*
6.027–6.034 Blue Green*
6.035–6.042 Blue Blue
6.043–6.049 Red Blue*
6.050–6.058 Red Red
S60C5A70
UP
#1,#4
#1
#2
#2
#5
#5
#4
#3
#3
45° 45°
E
S60C5A80
E
Cylinder body