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Replace the piston if scratches or
seizure is evident on its surfaces (especially the
thrust surface). Replace the piston if it is
cracked.
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1.Insert the piston pin into
the piston pin hole with your thumb. You should feel a
slight resistance. Replace the piston pin if it can be
easily inserted or there is an excessive
play.
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2.The piston and piston pin
must be replaced as an assembly.
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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, the piston
rings must also be replaced.
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![](../../../img/11/AK300195AA00ENG.png)
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2.Check for clearance
between the piston ring and ring groove. If it exceeds the
limit,
replace the ring or piston, or
both. Standard value:
Number 1:
0.03 - 0.07 mm Number 2: 0.02 - 0.06
mm
Limit: 0.1 mm
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![](../../../img/11/AK301481AD00ENG.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:
0.15 - 0.30 mm Number 2: 0.28 - 0.43
mm Oil: 0.10 - 0.40
mm
Limit:
Number 1, Number 2:
0.8 mm Oil: 1.0 mm
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1.Remove oil from the
crankshaft pin and the connecting rod bearing.
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![](../../../img/11/AK300196AE00ENG.png)
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2.Cut plastigage to the same
length as the width of the bearing and place it on the pin,
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/AK300197AE00ENG.png)
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5.Measure the width of the
plastigage at its widest part by using a scale printed on
the
plastigage package. Standard value: 0.02
- 0.05 mm Limit: 0.1 mm
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