Yamaha VMX12 2001, Руководство по обслуживанию

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ENG
CONNECTING RODS AND PISTONS
2. Measure:
• piston pin outside diameter
a
Out of specification
→
Replace the piston
pin.
3. Calculate:
• piston-pin-to-piston clearance
Out of specification
→
Replace the piston
pin.
Piston pin outside diameter
18.991 ~ 19.000 mm
Piston-pin-to-piston clearance =
Piston pin bore size
b
–
Piston pin outside diameter
a
Piston-pin-to-piston clearance
0.004 ~ 0.024 mm
<Limit>: 0.072 mm
4. 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.
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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.
Crankshaft-pin-to-big-end-bear-
ing clearance
0.021 ~ 0.039 mm