Checking The Big End Bearings - Yamaha YZF-R6 99 Service Manual

CONNECTING RODS AND PISTONS
4-72
4. Calculate:
S piston-pin-to-piston-pin-bore clearance
Out of specification ! Replace the piston
pin.
Piston-pin-to-piston-pin-bore clearance =
Piston pin bore diameter (in the piston)
–
Piston pin outside diameter
Piston-pin-to-piston-pin-bore
clearance
0.002
<Limit>: 0.072 mm

CHECKING THE BIG END BEARINGS

1. Measure:
S crankshaft-pin-to-big-end-bearing clearance
Out of specification ! Replace the big end
bearings.
Crankshaft-pin-to-big-end-
bearing clearance
0.028
The following procedure applies to all of the
connecting rods.
CAUTION:
Do not interchange the big end bearings and
connecting rods. To obtain the correct
crankshaft-pin-to-big-end-bearing clearance
and prevent engine damage, the big end
bearings must be installed in their original
positions.
a. Clean the big end bearings, crankshaft pins,
and bearing portions of the connecting rods.
b. Install the big end upper bearing into the con-
necting rod and the big end lower bearing
into the connecting rod cap.
NOTE:
Align the projections a on the big end bearings
with the notches b in the connecting rod and
connecting rod cap.
ENG
0.022 mm
0.052 mm