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The oil clearance can easily be
measured by using a "plastigage."
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When using the "plastigage,"
perform the measurement in the following
procedures.
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1.Fully wipe oil off the
outside diameter of the crankshaft and the inside diameter
of the bearing.
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2.Assemble the
crankshaft.
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![](../../../img/11/AK802794AC00ENG.png)
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3.Place the plastigage in
length equal to the bearing width on the journal shaft
straight in alignment with the shaft
centre. 4.Carefully install the lower crankcase
and tighten the bolt according to the main points to
installation. 5.Remove the bolt, and then
carefully remove the bearing cap.
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![](../../../img/11/AK802795AA00ENG.png)
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6.Measure the crushed
plastigage width (area most widely crushed) using the scale
printed on the plastigage bag. If the measurement value
exceeds the limits, replace the
bearing. Standard value: 0.029 - 0.047
mm Limit: 0.1 mm
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1.Visually check the
cylinder block for scratch, rust and corrosion. Use a flaw
detecting agent to check for cracks. If it is found faulty,
repair or replace it.
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![](../../../img/11/AK802797AA00ENG.png)
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2.Use a straight edge and
free gauge to measure distortion on the top surface of the
cylinder block. If distortion exceeds the limit, grind
and repair it. A gasket or the like must not be adhered
to the top surface of the cylinder block during the
measurement. Limit: 0.05
mm 3.Check the cylinder wall for scratch
or seizure. If there is any defect, replace the cylinder
block.
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![](../../../img/11/AK802796AC00ENG.png)
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4.Use the cylinder gauge to
measure the inside diameter and cylindricity of the
cylinder. If the cylinder is excessively worn, replace
the cylinder block or the piston and piston ring, or the
both. Measuring points are as shown in the
illustration. Standard
value:
Cylinder inside diameter: 86
mm Cylindricity: 0.0076 mm or
less
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