Yamaha F50A - Selecting the Crankshaft Main Journal Bearing

62Y3A11
5-62
1
2
3
4
5
6
7
8
I
NOTE:
• Align the alignment marks
b
on the con-
necting rod cap and connecting rod.
• Face the embossed “Y” mark on the con-
necting rod toward the flywheel side of the
crankshaft.
5. Tighten the connecting rod bolts to the
specified torques in two stages.
NOTE:
Do not turn the connecting rod until the crank
pin oil clearance measurement has been
completed.
6. Remove the connecting rod cap and
measure the width of the compressed
Plastigauge (PG-1) on each crank pin.
Replace the connecting rod bearing if out
of specification.
Selecting the crankshaft main
journal bearing
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 body mark
on the cylinder body
2
.
3. Select the suitable color
a
for the main
bearing from the table.
Connecting rod bolt:
1st: 6 N·m (0.6 kgf·m, 4.3 ft·lb)
2nd: 17 N·m (1.7 kgf·m, 12 ft·lb)
Crank pin oil clearance:
0.016–0.040 mm (0.0006–0.0015 in)
Cylinder
body mark
Crankshaft
journal mark
Bearing
color
AAYellow
AB
Red
BA
BB
Pink
CA
C B Green
Cylinder body