Yamaha F50F, Service Manual, Page: 136 / 305

POWR
Power unit
5-45
6C13G11
6. Install the crankcase onto the cylinder
block.
7. Apply engine oil to the threads of the
crankcase bolts, and then tighten them to
the specified torques in two stages and in
the sequence shown.
8. Remove the crankcase, and then mea-
sure the width of the compressed Plasti-
gauge (PG-1) on each main journal.
Replace the main bearing if out of speci-
fication.
Selecting the main bearings
1. When replacing the main bearing, select
the suitable bearing as follows.
2. Check the crankshaft journal mark on the
crankshaft
1
and the cylinder block mark
on the cylinder block
2
.
3. Select the suitable color
a
for the main
bearing from the table.
T
R
.
.
Crankcase bolt (M8):
1st: 15 N·m (1.5 kgf·m, 11.1 ft·lb)
2nd: 30 N·m (3.0 kgf·m, 22.1 ft·lb)
Crankcase bolt (M6):
1st: 6 N·m (0.6 kgf·m, 4.4 ft·lb)
2nd: 12 N·m (1.2 kgf·m, 8.9 ft·lb)
Crankshaft main journal oil
clearance:
0.012–0.036 mm
(0.0005–0.0014 in)