Removing The Connecting Rods; Checking The Crankshaft And Connecting Rods - Yamaha Star XVS13AA(C) 2011 Service Manual

EAS26010

REMOVING THE CONNECTING RODS

1. Remove:
• Connecting rod caps "1"
• Connecting rods
• Big end bearings
TIP
Identify the position of each big end bearing so
that it can be reinstalled in its original place.
1
EAS26090
CHECKING THE CRANKSHAFT AND
CONNECTING RODS
1. Measure:
• Crankshaft runout
Out of specification → Replace the crank-
shaft.
Runout limit C
0.020 mm (0.0008 in)
2. Check:
• Crankshaft journal surfaces
• Crankshaft pin surfaces
• Bearing surfaces
Scratches/wear → Replace the crankshaft.
3. Measure:
• Crankshaft-pin-to-big-end-bearing clearance
Out of specification → Replace the big end
bearings.
Oil clearance
0.030–0.054 mm (0.0012–0.0021
in)
The following procedure applies to all of the
connecting rods.
ECA13930
NOTICE
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.
M MMM M MMM M M MMM M
a. Clean the big end bearings, crankshaft pin,
and the inside of the connecting rod halves.
b. 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.
c. Put a piece of Plastigauge® "1" on the crank-
shaft pin.
e
d. Assemble the connecting rod halves.
TIP
• Do not move the connecting rod or crankshaft
until the clearance measurement has been
completed.
• Lubricate the bolts threads and nut seats with
molybdenum disulfide grease.
• Make sure the projection "c" on the connecting
rod faces towards the left side of the crank-
shaft.
5-84
CRANKSHAFT
M MMM M M MMM M M MMM M
1
MMM