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1.Check the cylinder head
for water leakage, gas leakage, damage or cracks before
cleaning.
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2.Completely remove oil,
scale, sealants, carbon, etc. After cleaning oil passages,
blow air to make sure that they are not clogged.
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![](../../../img/11/AK802793AA00ENG.png)
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3.Check the cylinder head
gasket surface for flatness by using a straightedge in the
directions of illustration. Limit: 0.03
mm
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![](../../../img/11/AK305408AB00ENG.png)
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1.Repair the valve seat if
the contact with the valve seat is poor, uneven or
broken. 2.Measure the margin. If the limit is
exceeded, replace the valve. Standard
value:
Inlet 1.3 mm Exhaust 1.5
mm
Limit:
Inlet 0.6
mm Exhaust 1.0 mm
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![](../../../img/11/AK305409AB00ENG.png)
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3.Measure overall length of
the valve. If the limit is exceeded, replace the
valve. Standard value:
Inlet
121.64 mm Exhaust 112.95
mm
Limit:
Inlet 121.14
mm Exhaust 112.45 mm
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![](../../../img/11/AK305410AB00ENG.png)
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1.Measure free height of the
spring. If the limit is exceeded, replace the
spring. Standard value:
Inlet
side: 65.7 mm Exhaust side: 60.37
mm
Limit:
Inlet side: 65.2
mm Exhaust side: 59.87
mm
2.Measure squareness of the
spring. If the inclination exceeds the limit, replace the
spring. Standard value: 2° or
less Limit: Maximum 4°
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![](../../../img/11/AK300168AE00ENG.png)
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Measure clearance between the valve
guide and valve stem. If the clearance exceeds the
limit, replace the valve guide or valve, or
both. Standard value:
Inlet 0.02
- 0.04 mm Exhaust 0.04 - 0.06
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
caution |
If the variation in the width
exceeds 0.2 mm even if the contact width is
within the standard value, replace or correct
the valve sheet.
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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/AK802968AC00ENG.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:
0.3 O.S.: 31.10 -
31.12 mm
Exhaust valve seat bore
diameter:
0.3 O.S.: 27.10 - 27.12
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.Ream the valve guide hole
of the cylinder head to match it with the press fit oversize
valve guide.
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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Valve guide bore
diameter
0.05 O.S.: 11.05 - 11.07
mm
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![](../../../img/11/AK802674AC00ENG.png)
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3.Press fit the valve guide
to the illustrated dimension. Standard value:
17.1 - 17.7 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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