![](../../../img/11/AK300167AA00ENG.png)
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1.Check the cylinder head
gasket surface for flatness by using a straight edge and
feeler
gauge. Standard value: 0.03 mm Limit: 0.2
mm 2.If it exceeds the limit, correct to
meet specification. Grinding limit: *0.2
mm
* Includes combined with
cylinder block grinding.
Cylinder head
height (Specification when new): 120 mm
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![](../../../img/11/AK300593AB00ENG.png)
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1.Check the valve seat
contact. Valve seat contact should be uniform at the center
of
the valve face. If incorrect, reface using a valve
refacer. 2.If the margin is below the limit,
replace the valve. Standard
value:
<Intake> 1.0
mm <Exhaust> 1.2
mm
Minimum
limit:
<Intake> 0.5
mm <Exhaust> 0.7mm
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![](../../../img/11/AK304590AB00ENG.png)
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3.Measure the valve’s
total length. If the measurement is less than the limit,
replace the valve. Standard
value:
<Intake> 111.33
mm <Exhaust> 113.54 mm
Minimum
limit:
<Intake> 110.83
mm <Exhaust> 113.04
mm
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![](../../../img/11/AK300718AB00ENG.png)
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1.Measure the free height of
the spring. If it is less than the limit,
replace. Standard
value:
<Intake> 54.8
mm <Exhaust> 56.1
mm
Minimum
limit:
<Intake> 53.8
mm <Exhaust> 55.1
mm
2.Measure the squareness of
the spring. If it exceeds the limit,
replace. Standard value: 2 degrees or
less Limit: 4 degrees
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![](../../../img/11/AK300168AE00ENG.png)
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Measure the clearance between the
valve guide and valve stem. If it exceeds the limit,
replace the valve guide or valve, or
both. Standard
value:
<Intake> 0.02 -
0.04 mm <Exhaust> 0.04 - 0.06
mm
Limit:
<Intake>
0.10 mm <Exhaust> 0.15
mm
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![](../../../img/11/AK300596AB00ENG.png)
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Assemble the valve, then measure
the valve stem projection between the end of the valve
stem and the spring seating surface. If the measurement
exceeds the specified limit, replace
the valve seat. Standard
value:
<Intake> 48.33
mm <Exhaust> 48.34
mm
Limit:
<Intake>
48.83 mm <Exhaust> 48.84
mm
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![](../../../img/11/AK300385AB00ENG.png)
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1.Before correcting the
valve seat, check for clearance between the valve guide and
valve
and, if necessary, replace the valve
guide. 2.Using the seat grinder, correct to obtain
the specified seat width and angle. 3.After
correcting the valve seat, lap the valve and valve seat
using lapping compound.
Then, check the valve stem projection.
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![](../../../img/11/AK300719AB00ENG.png)
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1.Cut the valve seat from
the inside to thin the wall thickness. Then, remove the
valve
seat.
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![](../../../img/11/AK300720AB00ENG.png)
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2.Rebore the valve seat hole
in the cylinder head to a selected oversize valve seat
diameter. Intake seat ring hole
diameters
0.3 oversize: 35.30 -
35.33 mm 0.6 oversize: 35.60 - 35.63
mm
Exhaust seat ring hole
diameters
0.3 oversize: 33.30 -
33.33 mm 0.6 oversize: 33.60 - 33.63 mm
3.Before fitting the valve seat,
either heat the cylinder head up to approximately
250°C
or cool the valve seat in liquid nitrogen, to prevent the
cylinder head bore from galling. 4.Using a valve
seat cutter, correct the valve seat to the specified width
and angle. See "VALVE SEAT RECONDITIONING PROCEDURE" on
the previous page.
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1.Using a press, remove the
valve guide toward the cylinder block.
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2.
caution |
Do not install a valve guide
of the same size again.
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Rebore the valve guide hole of the cylinder head so
that it fits the press-fitted oversize
valve guide. Valve guide hole
diameters
0.05 oversize 11.05 -
11.07 mm 0.25 oversize 11.25 - 11.27
mm 0.50 oversize 11.50 - 11.52 mm
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![](../../../img/11/AK304591AB00ENG.png)
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3.Press-fit the valve guide
until it protrudes 14.0 mm from the cylinder head top
surface
as shown in the illustration.
note |
When press-fitting the valve
guide, work from the cylinder head top
surface.
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note |
Pay attention to the
difference in length of the valve guides.
(Intake side: 45.5 mm;
exhaust side: 50.5 mm)
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note |
After installing the valve
guides, insert new valves in them to check for
smooth operation.
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