Yamaha 2008 WR450F, Owner'S Service Manual

Page: 153 / 220

5-59
CRANKCASE AND CRANKSHAFT
• Crank width "d"
Out of specification
→
Replace.
Use the dial gauge and a thick-
ness gauge.
CHECKING THE OIL STRAINER
1. Inspect:
• Oil strainer
Damage
→
Replace.
INSTALLING THE CRANKCASE
BEARING
1. Install:
• Bearing
•
Bearing stopper
• Bolt (bearing stopper)
• Screw (bearing stopper)
• Screw [bearing stopper (crank-
shaft)] "1"
To left and right crankcase.
•
Install the bearing by pressing its
outer race parallel.
•
To prevent the screw [bearing stop-
per (crankshaft)] from becoming
loose, crush the screw head periph-
ery "a" into the concave "b" using a
punch etc. In so doing, take care
not to damage the screwdriver re-
ceiving hole in the screw head.
INSTALLING THE CRANKSHAFT
1. Install:
•
Crankshaft "1"
Use the crankshaft installing tool
"2", "3", "4" and "5".
• Hold the connecting rod at top dead
center with one hand while turning
the nut of the installing tool with the
other. Operate the installing tool un-
til the crankshaft bottoms against
the bearing.
• Before installing the crankshaft,
clean the contacting surface of
crankcase.
Do not use a hammer to drive in
the crankshaft.
A. For USA and CDN
B. Except for USA and CDN
2. Check:
• Shifter operation
•
Transmission operation
Unsmooth operation
→
Repair.
3. Install:
• Oil strainer "1"
•
Bolt (oil strainer) "2"
4. Apply:
• Sealant
On the right crankcase.
Clean the contacting surface of left
and right crankcase before applying
the sealant.
Dial gauge and stand:
YU-3097/90890-01252
Standard <Limit>
Runout
limit: 0.03 mm
(0.0012 in)
0.05 mm
(0.002 in)
Small
end
free
play:
0.4–1.0 mm
(0.016–0.039
in)
2.0 mm
(0.08 in)
Side
clear-
ance: 0.15–0.45
mm (0.0059–
0.0177 in)
0.50 mm
(0.02 in)
Crack
width:
61.95–62.00
mm (2.439–
2.441 in)
—
Bolt (bearing stopper):
10 Nm (1.0 m•kg, 7.2
ft•lb)
Screw (bearing stopper):
10 Nm (1.0 m•kg, 7.2
ft•lb)
Screw [bearing stopper
(crankshaft)]:
14 Nm (1.4 m•kg, 1.0
ft•lb)
Crankshaft installing pot
"2":
YU-90050/90890-01274
Crankshaft installing bolt
"3":
YU-90050/90890-01275
Adapter (M12) "4":
YU-90063/90890-01278
Spacer (crankshaft in-
staller) "5":
YM-91044/90890-04081
Bolt (oil strainer):
10 Nm (1.0 m•kg, 7.2
ft•lb)
YAMAHA Bond No. 1215
(ThreeBond
®
No.1215):
90890-85505