Yamaha TMAX 2020 Service Manual page 311

3. Measure:
• Crankshaft-pin-to-big-end-bearing clearance
Out of specification  Replace the big end
bearings.
Connecting rod
Oil clearance
0.039–0.063 mm (0.0015–0.0025
in)
Balancer
Balancer shaft journal to balanc-
er shaft bearing clearance
0.036–0.060 mm (0.0014–0.0024
in)
The following procedure applies to all of the
connecting rods and balancer connecting
rod.
ECA13930
NOTICE
Do not interchange the big end bearings and
connecting rods. To obtain the correct
crankshaft-pin-to-big-end-bearing clear-
ance and prevent engine damage, the big
end bearings must be installed in their origi-
nal positions.
a. Clean the big end bearings, crankshaft
pins, and the inside of the connecting rod
halves.
b. Install the big end upper bearing into the
connecting rod and the big end lower bear-
ing into the connecting rod cap.
TIP
Align the projections "a" on the big end bearings
with the notches "b" in the connecting rod and
connecting rod cap.
c. Put a piece of Plastigauge® "1" on the
crankshaft pin.
d. Assemble the connecting rod halves.
TIP
• Do not move the connecting rod or crankshaft
until the clearance measurement has been
completed.
• Lubricate the bolts threads and nut seats with
molybdenum disulfide grease.
• Make sure the "Y" mark "c" on the connecting
rod faces towards the left side of the crank-
shaft.
• Make sure the characters "d" on both the con-
necting rod and connecting rod cap are
aligned.
e. Tighten the connecting rod nuts.
Refer to "INSTALLING THE CONNECT-
ING RODS" on page 5-79.
f. Remove the connecting rod and big end
bearings.
Refer to "REMOVING THE CONNECTING
RODS" on page 5-75.
g. Measure the compressed Plastigauge®
width "e" on the crankshaft pin.
If the crankshaft-pin-to-big-end-bearing
clearance is out of specification, select re-
placement big end bearings.
5-76
CRANKSHAFT
1