![](../../../img/11/AK600916AA00ENG.png)
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1.Check the cylinder head
gasket surface for flatness by using a straight edge and
feeler
gauge. Standard value: Less than 0.03 mm
Limit: 0.05 mm 2.If the service limit
is exceeded, correct to meet the
specification. Grinding limit: *0.15
mm
* Includes combined with
cylinder block grinding.
*If the
service limit is exceeded, correct to meet the
specification. Cylinder head height
(specification when new): 120 mm
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![](../../../img/11/AK600792AB01ENG.png)
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1.Check the valve seat
contact. Valve seat contact should be uniform at the centre
of the
valve face. If incorrect, reface using a valve
refacer. 2.If the margin is below the limit,
replace the valve. Standard
value:
Inlet 1.0 mm Exhaust 1.2
mm
Minimum limit:
Inlet 0.5
mm Exhaust 0.7 mm
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![](../../../img/11/AK600793AB00ENG.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:
Inlet 111.84 mm Exhaust 114.04
mm
Minimum limit:
Inlet 111.34
mm Exhaust 113.54 mm
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![](../../../img/11/AK600794AB01ENG.png)
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1.Measure the free height of
the spring. If it is less than the limit,
replace. Standard value:
Inlet
63.77 mm Exhaust 59.90 mm
Minimum
limit:
Inlet 62.77 mm Exhaust 58.90
mm
2.Measure the squareness of
the spring. If it exceeds the limit,
replace. Standard value: 2° or
less Limit: 4°
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![](../../../img/11/AK600799AB00ENG.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:
Inlet 0.020
- 0.047 mm Exhaust 0.035 - 0.062
mm
Limit:
Inlet 0.10
mm Exhaust 0.15 mm
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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: 11.050 -
11.068 mm
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![](../../../img/11/AK600917AB00ENG.png)
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3.Press-fit the valve guide
until it projects by the specified
amount. Standard value: 16.7 - 17.3
mm
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.
[Inlet side: 45.5
mm; exhaust side: 52.5 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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![](../../../img/11/AK600918AB00ENG.png)
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Assemble the valve, then measure
the contact width. If the measurement exceeds the specified
limit, replace the valve seat. Standard value:
0.9 - 1.3 mm
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![](../../../img/11/AK600795AB00ENG.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/AK600796AB00ENG.png)
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2.Rebore the valve seat hole
in the cylinder head to a selected oversize valve seat
diameter. Inlet seat ring hole
diameters
0.3 oversize: 36.300 -
36.325 mm
Exhaust seat ring hole
diameters
0.3 oversize: 32.300 -
32.325 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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![](../../../img/11/AK600919AB00ENG.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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