Yamaha FZ6-ST Supplementary Service Manual - Eng
ENG
20
CHECKING THE BIG END BEARINGS
1. Measure:
• crankshaft-pin-to-big-end-bearing clear-
ance
Out of specification
→ Replace the big end
bearings.
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 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.
NOTE:
NOTE:
Align the projections
on the big end bear-
ings with the notches
in the connecting rod
and connecting rod cap.
c. Put a piece of Plastigauge
®
on
the
crankshaft pin.
d. Assemble the connecting rod halves.
NOTE:
NOTE:
• Do not move the connecting rod or crankshaft
until the clearance measurement has been
completed.
• Lubricate the bolt threads and seats with
molybdenum disulfide grease.
• Make sure that the “Y” mark
on the con-
necting rod faces towards the left side of the
crankshaft.
• Make sure that the characters
on both the
connecting rod and connecting rod cap are
aligned.
Crankshaft-pin-to-big-end-bearing
clearance
0.028 ~ 0.052 mm
(0.0011 ~ 0.0020 in)
CONNECTING RODS AND PISTONS