Yamaha R1 Series 2015, Service Manual

Page: 417 / 704

CONNECTING RODS AND PISTONS
5-76
EAS30750
CHECKING THE CONNECTING RODS
1. Measure:
• Crankshaft-pin-to-big-end-bearing clearance
Out of specification
o
Replace the big end
bearings.
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The following procedure applies to all of the
connecting rods.
NOTICE
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 origi-
nal positions.
a. Clean the big end bearings, crankshaft pins,
and the connecting rods with oil cleaner.
TIP
When cleaning the connection rod, clean the
bearing surface “a” of the connecting rod bolt
and threads “b”.
b. Wait five minutes to dry the remaining oil
cleaner component.
c. Install the big end upper bearing into the con-
necting rod and the big end lower bearing 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.
d. Put a piece of Plastigauge® “1” on the crank-
shaft pin.
e. Assemble the connecting rod halves.
NOTICE
ECA18390
Tighten the connecting rod bolts using the
plastic-region tightening angle method. Al-
ways install new bolts.
TIP
•
Install the new connecting rod bolt without
cleaning and without any oil.
•
Make sure that the projection “a” on the con-
necting rod cap faces the same direction as the
“Y” or “ ” mark “b” on the connecting rod.
• After installing the big end bearing, assemble
the connecting rod and connecting rod cap
without installing them onto the crankshaft.
Piston-pin-to-piston-pin-bore
clearance
0.002–0.022 mm (0.0001–0.0009
in)
Limit
0.072 mm (0.0028 in)
Oil clearance
0.033–0.057 mm (0.0013–0.0022
in)
a b
a b
1
a
b