Checking The Big End Bearings - Yamaha YZFR1W 2007 Service Manual

4. Calculate:
• Piston-pin-to-piston-pin-bore clearance
Out of specification → Replace the piston
pin and piston as a set.
Piston-pin-to-piston-pin-bore clearance =
Piston pin bore diameter "b" -
Piston pin outside diameter "a"
Piston-pin-to-piston-pin-bore
clearance
0.002–0.022
0.0009 in)
Limit
0.072 mm (0.0028 in)
EAS4C81015

CHECKING THE BIG END BEARINGS

1. Measure:
• Crankshaft-pin-to-big-end-bearing clear-
ance
Out of specification → Replace the big end
bearings.
Crankshaft-pin-to-big-end-bear-
ing clearance
0.034–0.058 mm
(0.0013–0.0023 in)
Limit
0.09 mm (0.0035 in)
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
The following procedure applies to all of the
connecting rods.
ECA14900
CAUTION:
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.
mm (0.0001–
5-74
a. Clean the big end bearings, crankshaft
pins, and the inside of the connecting rods
halves.
b. Install the big end upper bearing into the
connecting rod and the big end lower bear-
ing into the connecting rod cap.
NOTE:
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.
d. Assemble the connecting rod halves.
NOTE:
• Do not move the connecting rod or crank-
shaft until the clearance measurement has
been completed.
• Lubricate the bolt threads with molybdenum
disulfide grease.
• Make sure that the "Y" mark "c" on the con-
necting rod faces towards the left side of the
crankshaft.
• Make sure that the characters "d" on both the
connecting rod and connecting rod cap are
aligned.
CRANKSHAFT