3.2.5 Crankshaft
1) Inspection of crankshaft
(1) Defect check
By naked eyes, check for any scratch or damage on
the crankshaft journal and crank pin.
By means of magnetic particle test and color check,
check the crankshaft for any crack and if found, replace
it.
(2) Wear measuring
With an outside micrometer measure the diameter of
the crankshaft journals and pins in the directions as
shown, and compare the measured values to determine
the amount of wear.
If the amount of wear is beyond the limit, have the
crankshaft ground and install undersize bearings.
However, if the amount of wear is within the limit, you
can correct the wear using an oil stone or oiled grinding
paper of fine grain size. (Be sure to use grinding paper
which has been immersed in oil.)
In case that pin‘s wear is more than the limit value,
grind the crankshaft journal and crank pin, and use the
undersized bearings.
CAUTION:
Be sure to use grinding paper which
has been immersed in oil.
5ton Diesel Engine SPC000006
Page 55
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