Yamaha 2012 TMAX XP500A, Service Manual

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CRANKSHAFT
5-78
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4. Select:
• Big end bearings (P
1
–P
3
)
TIP
• The numbers “A” stamped into the crank-
shaft web and the numbers “B” on the con-
necting rods are used to determine the
replacement big end bearing sizes.
• P
1
–P
3
refer to the bearings shown in the
crankshaft illustration.
For example, if the connecting rod P
1
and
the crankshaft web P
1
numbers are 5 and 1
respectively, then the bearing size for P
1
is:
5. Measure:
• Crankshaft-journal-to-crankshaft-journal
bearing clearance.
Out of specification
→
Replace the crank-
shaft journal bearings.
The following procedure applies to all of the
crankshaft journal bearings.
ECA13920
Do not interchange the crankshaft journal
bearings. To obtain the correct crankshaft-
journal-to-crankshaft-journal-bearing clear-
ance and prevent engine damage, the
crankshaft journal bearings must be
installed in their original positions.
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ECA4B51026
On the journal, the larger value is used as a
basis for calculation of the oil clearance,
and on the journal bearing, the smaller
value is used.
a. Clean the crankshaft journal bearings,
crankshaft journals, and bearing portions of
the crankcase.
b. Check the bearing surface. If the bearing
surface is worn or scratched, both bearings
should be replaced.
TIP
If either of the right or left journal bearing is
worn or scratched, both bearings should be
replaced as a set.
c. Measure the crankshaft journal diameter
“a” of each crankshaft journal at two
P
1
(connecting rod) - P
1
(crankshaft)
=
5 - 1 = 4 (green)
Bearing color code
1.Blue 2.Black 3.Brown
4.Green
Journal oil clearance
0.040–0.082 mm (0.0016–
0.0032 in)