Yamaha TMAX 2020, Service Manual

Page: 312 / 688

5-77
CRANKSHAFT
4. Select:
• Big end bearings (P
1
–P
3
)
TIP
• The numbers “A” stamped into the crankshaft
web and the numbers “B” on the connecting
rods are used to determine the replacement
big end bearing sizes.
• P
1
–P
3
refer to the bearings shown in the crank-
shaft illustration.
For example, if the connecting rod P
1
and the
crankshaft web P
1
numbers are 5 and 1 re-
spectively, 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.
TIP
On the journal, the larger value is used as a ba-
sis for calculation of the oil clearance, and on the
journal bearing, the smaller value is used.
The following procedure applies to all of the
crankshaft journal bearings.
NOTICE
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 crank-
shaft journal bearings must be installed in
their original positions.
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.
e
B
P
1
(connecting rod) - P
1
(crankshaft)
= 5 - 1
= 4 (green)
Bearing color code
Code 1
Blue
Code 2
Black
Code 3
Brown
Code 4
Green
Journal oil clearance
0.040–0.087 mm (0.0016–0.0034
in)