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1.Check the piston ring for
damage, excessive wear, and breakage. Replace if defects
are evident. If the piston has been replaced with a new one,
the piston rings must also be replaced
with new ones.
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![](../../../img/11/AK600927AA00ENG.png)
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2.Check for clearance
between the piston ring and ring groove. If the limit is
exceeded,
replace the ring or piston, or
both. Standard value:
Number 1:
0.04 - 0.08 mm Number 2: 0.03 - 0.07
mm
Limit: 0.1 mm
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![](../../../img/11/AK600928AB00ENG.png)
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3.Insert the piston ring
into the cylinder bore. Force the ring down with a piston,
the
piston crown being in contact with the ring, to correctly
position it at right angles to the
cylinder wall. Then, measure the end gap with a feeler
gauge. If the ring gap is excessive, replace the piston
ring. Standard value:
Number 1:
0.18 - 0.33 mm Number 2: 0.28 - 0.48
mm Oil: 0.10 - 0.60
mm
Limit:
Number 1: 0.4
mm Number 2: 0.6 mm Oil: 0.8
mm
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The crankshaft oil clearance can be
measured easily by using plastigage method, as
follows:
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1.Remove oil from the
crankshaft pin and the bearing inner surface.
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![](../../../img/11/AK600906AB00ENG.png)
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2.Cut plastigage to the same
length as the width of the bearing and place it on the pin
in parallel with its axis. 3.Install the
connecting rod cap carefully and tighten the nuts to the
specified torque. 4.Carefully remove the
connecting rod cap.
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![](../../../img/11/ACF02823AA00ENG.png)
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5.Measure the width of the
smashed plastigage at its widest section by using a scale
printed
on the plastigage bag. Standard value: 0.022
- 0.049 mm Limit: 0.1 mm
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