Crankshaft And Connecting Rods; Checking The Crankshaft And Connecting Rods - Yamaha XV17AS(C) Supplementary Service Manual

CRANKSHAFT AND CONNECTING RODS

CRANKSHAFT AND
CONNECTING RODS
EAS00398
CHECKING THE CRANKSHAFT AND
CONNECTING RODS
1. Measure:
• crankshaft runout
Out of specification → Replace the crank-
shaft.
Maximum crankshaft runout
0.04 mm (0.0016 in)
2. Check:
• crankshaft journal surfaces
• crankshaft pin surfaces
• bearing surfaces
Scratches/wear → Replace the crankshaft
and bearings.
• generator shaft drive gear 1
Damage/wear → Replace the crankshaft.
3. Measure:
• crankshaft pin-to-big end bearing clearance
Out of specification → Replace the big end
bearings.
Crankshaft pin-to-big end bearing
clearance
0.037 ~ 0.074 mm
(0.0015 ~ 0.0029 in)
<Limit>: 0.09 mm (0.0035 in)
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The following procedure applies to all of the
connecting rods.
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.
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ENG
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