YG125-30A Maintenance Manual
Crankcase, crankshaft and Shift mechanism
100
13
Nut M14*1.25
1
14
bear
1
Apply engine oil while assembling
Crankshaft and balance shaft inspection
1.
Check whether the crankshaft journals are
abnormally worn, whether the connecting rod can
rotate flexibly and whether there is significant noise
while rotating.
Measure the connecting rod small end bore diameter.
Maintenance limit:
≤Ф
20.063mm.
2.
Measure the crankshaft radial run out.
Maintenance limit:
≤
0.10mm.
3.
Measure the connecting rod big end radial
clearance.
Maintenance limit:
≤
0.06mm.
4.
Measure the connecting rod large end side
clearance, the maintenance limit:
≤
0.80mm.
5.
Measure the left hand crank journal.
Maintenance limit:
≥Ф
29.87mm.
6.
Check whether the balance shaft supplementary
tooth spring fails and whether the balance shaft
supplementary tooth can return.
Inside micrometer
105
80
Radial runout
detector
Dial gauge
Suppo
r
t
Outside
micromete
r
Clearance gauge
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