Checking The Crankshaft - Yamaha PW50W 2007 Service Manual

2
a
b
c
d
CRANKCASE AND CRANKSHAFT
3. Check:
1
4. Check:

CHECKING THE CRANKSHAFT

1. Measure:
a
5-41
9 Crankcase (left) 1
9 Crankcase (right) 2
→
Cracks/damage
crankcase.
9 Bearing
Unsmooth operation → Replace the
bearing.
9 Runout a
9 Small end free play b
9 Connecting rod big end side clearance c
9 Crank width d
Out of specification → Replace the crank-
shaft assembly.
Use the dial gauge and thickness gauge.
Dial gauge and stand
90890-01252
Runout
0.050 mm (0.0020 in)
Small end free play
0.40-0.80 mm (0.02-0.03 in)
Connecting rod big end side
clearance
0.350-0.550 mm
(0.0138-0.0217 in)
Crank width
37.90-37.95 mm (1.492-1.494 in)
ENG
Replace the