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1.Before cleaning, check the
cylinder head for leakage of coolant or exhaust gas as
well as cracks or other damage.
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2.Remove oil, scale,
sealant, carbon and other residues completely. Clean the oil
passages
and blow compressed air through them to verify that they are
free of restriction.
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![](../../../img/11/AK304889AA00ENG.png)
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3.
caution |
The grinding limit for the
cylinder head and block combined
is 0.2 mm.
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Using a straight edge and a thickness gauge, measure
the flatness of the cylinder head
bottom surface. Bottom face
distortion
Standard value: 0.03 mm or
less
Cylinder head height (standard value
for new part): 112.9 - 113.1 mm
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![](../../../img/11/AK305408AB00ENG.png)
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1.If the valve face-to-seat
contact is uneven or interrupted, correct the valve
seat. 2.Measure the valve head margin. If the
measured value exceeds the limit, replace with
a new valve. Standard
value:
Inlet 0.85 mm Exhaust 1.50
mm
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![](../../../img/11/AK305409AB00ENG.png)
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3.Measure the valve overall
length. If the measured value exceeds the limit, replace
with
a new valve. Standard
value:
Inlet 87.21 mm Exhaust 88.54
mm
Limit:
Inlet 86.71
mm Exhaust 88.04 mm
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![](../../../img/11/AK305410AB00ENG.png)
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1.Measure the valve spring
free height. If the measured value exceeds the limit,
replace
with a new spring. Standard value: 49.6
mm Limit: 48.6 mm 2.Measure the valve
spring out-of-squareness. If the measured value exceeds the
limit,
replace with a new spring. Standard value:
2° or less Limit: 4°
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![](../../../img/11/AK300168AE00ENG.png)
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Measure the clearance between the
valve guide and the valve stem. If the measured value
exceeds the limit, replace the valve guide or the valve, or
both. Standard value:
Inlet 0.020
- 0.047 mm Exhaust 0.030 - 0.057
mm
Limit:
Inlet 0.10
mm Exhaust 0.15 mm
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![](../../../img/11/AK802963AC00ENG.png)
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Assemble the valve, then measure
the contact width. If the measurement exceeds the specified
limit, replace or correct the valve
seat. Standard value: 1.1 - 1.5
mm
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1.Check clearance between
valve guide and valve and replace the valve guide if
necessary
before repairing the valve seat.
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![](../../../img/11/AK600919AG00ENG.png)
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2.Repair the valve seat so
that seat width and seat angle can become the specified
shape. 3.Smear a lapping compound on the valve and
valve seat after the repair. Fit the valve
into the valve seat.
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![](../../../img/11/AK300719AB01ENG.png)
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1.Scrape the valve seat to
be replaced from inside. Make its wall thickness thin before
pulling out.
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![](../../../img/11/AK300720AB00ENG.png)
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2.Repair the valve seat hole
of the cylinder head to match it with the diameter of the
press
fit oversize valve seat. Inlet valve seat
bore diameter
0.30 O.S.: 31.83 -
31.85 mm
Exhaust valve seat bore
diameter
0.30 O.S.: 28.32 - 28.34
mm
3.Press fit the valve seat,
paying attention not to score the cylinder head inner
diameter
at room temperature. 4.Ream the valve
seat. Refer to “Repair procedures of valve
seat."
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1.Pull out the valve guide
with a press toward the cylinder block side.
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2.
caution |
Do not use a valve guide with
the same size as the pulled out
valve guide because it cannot be press
fitted.
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Ream the valve guide hole of the cylinder head to
match it with the press fit oversize
valve guide. Inlet valve guide bore
diameter
0.05 O.S.: 10.56 - 10.58
mm
Exhaust valve guide bore
diameter
0.05 O.S.: 10.55 - 10.57
mm
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![](../../../img/11/AKA00088AB00ENG.png)
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3.Press fit the valve guide
to the illustrated dimension. Standard value:
12.7 - 13.3 mm
note |
Press fit the valve guide from
the cylinder head top surface.
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4.After pressing fit the valve guide, insert
a new valve to check for sliding.
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