Crankshaft; Timing Chain And Timing Chain Guide - Yamaha YZ426F(P) Owner's Service Manual

Fahrer- und wartungs-handbuch
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CRANKCASE AND CRANKSHAFT
4 - 87

Crankshaft

1. Remove:
Crankshaft 1
G
Use the crankcase separating tool 2.
Crankcase separating tool:
YU-1135-A/90890-01135
CAUTION:
Do not use a hammer to drive out the
crankshaft.
Crankshaft bearing
1. Remove:
Bearing 1
G
NOTE:
Remove the bearing from the crankcase by
G
pressing its inner race.
Do not use the removed bearing.
G
INSPECTION

Timing chain and timing chain guide

1. Inspect:
Timing chain
G
Cracks/stiff → Replace the timing chain
and camshaft sprocket as a set.
2. Inspect:
Timing chain guide
G
Wear/damage → Replace.
EC4N4101
Crankcase
1. Inspect:
Contacting surface a
G
Scratches → Replace.
Engine mounting boss b, crankcase
G
Cracks/damage → Replace.
2. Inspect:
Bearing
G
Rotate inner race with a finger.
Rough spot/seizure → Replace.
3. Inspect:
Oil seal
G
Wear/damage → Replace.
ENG

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Yz426f

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