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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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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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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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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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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 Max.
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