Yanmar ViO12-2A, Руководство по обслуживанию

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4. ENGINE
4-3-18
2) Color Check of Crank Shaft
Clean the crank shaft and check it using a color check kit
or a magnetic inspector. Replace the crank shaft if it is
cracked or badly damaged. If the damage is minor, cor-
rect it by re-grinding.
3) Checking the Metals
Check the metals for flaking, melting, seizure, and the
state of the contact spur face. Replace any of the metals
if it is damaged.
4) Bend of the Crank Shaft
Support the journals of the crank shaft with V-blocks at
both ends. Measure the runout at the center journal with
a dial gauge while rotating the crank shaft to check the
bend of the crank shaft.
5) Measuring the of Crank Pin and Journal
Measure the outside diameters, roundness, taper angles
of the crank pin and journal. If the partial wear or the
roundness exceeds the wear limit but the measured out-
side diameter is within the limit, correct it by regrinding.
Replace the crank shaft with a new one, if it is unrepara-
ble. An under sized crank pin metal by 0.25
mm is
available. (Refer to Section 4-2-5, 4-2-8 in this
chapter.)
Bend
Refer to Section "3-2 1)
Nominal and Allowable Val-
ues".
(Inspection by color check)
Runout
(Measuring the crank shaft bend)
Bend
Dial gauge
V-block V-block
R
R
Crank pin
Crank journal
Measuring points of the crank pin
and journal
(
)