Yamaha RS90RK, Service Manual

Page: 560 / 841

5-71
ENG
CRANKCASE
18. Align:
• Bolt heads
(with the connecting rod caps)
19. Tighten:
• Connecting rod nuts
• Replace the connecting rod bolts and nuts
with new ones.
CAUTION:
Tighten the connecting rod bolts using the
plastic-region tightening angle method. Always
install new bolts and nuts.
• Clean the connecting rod bolts and nuts.
• Tighten the connecting rod nuts.
• Put a mark
a
on the corner of the connecting
rod nut 1 and the connecting rod 2 .
• Tighten the connecting rod nut further to
reach the specified angle (120°).
WARNING
When the nut is tightened more than the speci-
fied angle, do not loosen the nut and then
retighten it.
Replace the bolt with a new one and perform
the procedure again.
CAUTION:
• Do not use a torque wrench to tighten the nut
to the specified angle.
• Tighten the nut until it is at the specified
angles.
NOTE:
When using a hexagonal nut, note that the angle
from one corner to another is 60°.
20. Lubricate:
• Crankshaft journal bearings
(with the recommended lubricant)
T
R
.
.
Connecting rod nut:
1st: 20 Nm (2.0 m · kg, 14 ft · lb)
Final: Specified angle 120°
Recommended lubricant:
Engine oil