Yamaha FJR1300A(D), Service Manual

Page: 390 / 662

CONNECTING RODS AND PISTONS
5-89
4. Calculate:
• Piston-pin-to-piston-pin-bore clearance
Out of specification
→
Replace the piston pin
and piston as a set.
ET3P61028
CHECKING THE CONNECTING RODS
1. Measure:
• Crankshaft-pin-to-big-end-bearing clearance
Out of specification
→
Replace the big end
bearings.
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The following procedure applies to all of the
connecting rods.
NOTICE
ECA13930
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.
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
• Do not move the connecting rod or crankshaft
until the clearance measurement has been
completed.
• Lubricate the bolt threads and nut seats with
molybdenum disulfide grease.
• Make sure the “Y” mark “c” on the connecting
rod faces towards the left side of the crank-
shaft.
• Make sure the characters “d” on both the con-
necting rod and connecting rod cap are
aligned.
Piston pin bore inside diameter
19.004–19.015 mm (0.7482–
0.7486 in)
Limit
19.045 mm (0.7498 in)
• Piston-pin-to-piston-pin-bore clearance =
Piston pin bore diameter “b” -
Piston pin outside diameter “a”
Piston-pin-to-piston-pin-bore
clearance
0.004–0.024 mm (0.00016–
0.00094 in)
Oil clearance
0.031–0.048 mm (0.0012–0.0019
in)
1
d
c
E