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Crankshaft Removal; Crankshaft Inspection - Yamaha YW50AP Service Manual

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2
F
C
1
C
D
CRANKSHAFT

CRANKSHAFT REMOVAL

1. Attach:
8 Crankcase separating tool 1
Crankcase separating tool:
YU-01135-A
2. Remove:
8 Crankshaft 2
NOTE:
Make sure the crankcase separating tool is cen-
tered over the crankshaft assembly.

CRANKSHAFT INSPECTION

1. Measure:
8 Runout limit " C"
8 Connecting rod big end side clearance
"D"
8 Small end free play limit "F"
Out of specification→Replace.
Use V-blocks, dial gauge and thickness
gauge.
Runout limit "C":
0.03 mm(0.0012 in)
Connecting rod big end side clear-
ance "D":
0.2 ~ 0.5 mm(0.0079 ~ 0.020 in)
Small end free play " F":
0.4 ~ 0.8 mm(0.016 ~ 0.031 in)
2. Inspect:
8 Bearings (crankshaft)
Spin the bearing inner race.
Excessive play/Roughness→Replace.
Pitting/Damage→Replace.
4-39
ENG

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