Selecting The Connecting Rod Bearing - Yamaha F150B Service Manual

POWR
5. Tighten the connecting rod bolts to the
specified torques in 3 stages. In the 3rd
stage, make a mark b on the connecting
rod cap bolts, connecting rod caps, and
then tighten the bolts 90° from the mark.
c
Connecting rod bolt:
1st: 23 N·m (2.3 kgf·m, 17.0 ft·lb)
2nd: 43 N·m (4.3 kgf·m, 31.7 ft·lb)
3rd: 90°
TIP:
• Reuse the removed connecting rod bolts
when checking the oil clearance.
• Do not turn the connecting rod until the
crankpin oil clearance measurement has
been completed.
6. Remove the connecting rod cap and
measure the width of the compressed
Plastigauge (PG-1) on each crankpin.
Replace the connecting rod bearing if out
of specification.
7-57
Power unit
90
Crankpin oil clearance (reference data):
0.027–0.052 mm (0.0011–0.0020 in)

Selecting the connecting rod bearing

1. When replacing the connecting rod bear-
ing, select the suitable bearing as fol-
lows.
2. Measure the connecting rod big end
inside diameter a.
Example:
Connecting rod big
end inside diameter
a
53.035 mm
TIP:
Reuse the removed connecting rod bolts
when measuring the connecting rod bearing.
3. Check the crankpin mark b on the
crankshaft.
a
Numerical value in
table
35