Yamaha 2012 TMAX XP500A Service Manual page 338

3. Measure:
• Crankshaft-pin-to-big-end-bearing clear-
ance
Out of specification → Replace the big
end bearings.
Oil clearance
plastigauge®)
Connecting rod
0.040–0.064
0.0025 in)
Balancer connecting rod
0.036–0.060
0.0024 in)
The following procedure applies to all of the
connecting rods and balancer connecting
rod.
ECA13930
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 orig-
inal 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 bear-
ings with the notches "b" in the connecting rod
and connecting rod cap.
c. Put a piece of Plastigauge® "1" on the
crankshaft pin.
(using
mm (0.0016–
mm (0.0014–
5-77
d. Assemble the connecting rod halves.
TIP
• Do not move the connecting rod or crank-
shaft 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
connecting rod and connecting rod cap are
aligned.
e. Tighten the connecting rod nuts.
Refer to "INSTALLING THE CONNECTING
RODS" on page 5-80.
f. Remove the connecting rod and big end
bearings.
Refer to "REMOVING THE CONNECTING
RODS" on page 5-76.
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
replacement big end bearings.
CRANKSHAFT