Checking The Connecting Rods - Yamaha VMAX 2009 Service Manual

Piston pin bore inside diameter
19.004–19.015 mm (0.7482–
0.7486 in)
Limit
19.045 mm (0.7498 in)
b
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 inside diameter "b" -
Piston pin outside diameter "a"
Piston-pin-to-piston-pin-bore
clearance
0.004–0.024 mm (0.0002–0.0009
in)
Limit
0.074 mm (0.0029 in)
EAS2S31042

CHECKING THE CONNECTING RODS

1. Measure:
• Crankshaft-pin-to-big-end-bearing clearance
Out of specification → Replace the big end
bearings.
Oil clearance
0.032–0.056 mm (0.0013–0.0022
in)
M MMM M MMM M M MMM M
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 M MMM M M MMM M
CONNECTING RODS AND PISTONS
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 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.
d. Assemble the connecting rod halves.
TIP
• Lubricate the bolt threads and seats with mo-
lybdenum disulfide oil.
• Make sure that the projection "a" on the con-
necting rod cap faces the same direction as the
"Y" mark "b" on the connecting rod.
MMM
a
e. Replace the connecting rod bolts with new
ones.
5-85
1
b