Yamaha WR400F(M) Owner's Service Manual page 430

CRANKCASE AND CRANKSHAFT
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EC4N4101
Crankcase
1. Inspect:
Contacting surface a
Scratches
Engine mounting boss b, crankcase
Cracks/damage
2. Inspect:
Bearing
Rotate inner race with a finger.
Rough spot/seizure
3. Inspect:
Oil seal
Wear/damage
EC4N4201
Crankshaft
1. Measure:
Run-out limit a
Small end free play limit b
Connecting rod big end side clearance
c
Crank width d
Out of specification
Use the dial gauge and a thickness
gauge.
Dial gauge and stand:
YU-03097/90890-01252
Standard
0.03 mm
Run-out
(0.0012 in)
limit:
Small end
0.4 ~ 1.0 mm
free play:
(0.016 ~ 0.039 in)
Side
0.15 ~ 0.45 mm
(0.0059 ~ 0.0177 in)
clearance:
Crack
61.95 ~ 62.00 mm
(2.439 ~ 2.441 in)
width:
ENG
Replace.
Replace.
Replace.
Replace.
Replace.
<Limit>
0.05 mm
(0.002 in)
2.0 mm
(0.08 in)
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