![](../../../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
Limit:
Intake 0.5
mm Exhaust 0.7 mm
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![](../../../img/11/AK103808AC00ENG.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 112.00 mm Exhaust 113.81
mm
Limit:
Intake 111.50
mm Exhaust 113.31 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: 51.03
mm Limit: 50.03 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/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
0.020 - 0.047 mm Exhaust 0.035 -
0.062 mm
Limit:
Intake 0.10
mm Exhaust 0.15 mm
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![](../../../img/11/AK601281AC00ENG.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/AK600715AC00ENG.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. Standard
value: 43.5° -
44° 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: 34.300 -
34.325 mm 0.6 oversize: 34.600 - 34.625
mm
Exhaust seat ring hole
diameters
0.3 oversize: 31.800 -
31.825 mm 0.6 oversize: 32.100 - 32.125 mm
3.When the valve sheet is a
press fit, engine oil is applied to the valve sheet or the
cylinder head not to damage the inside diameter of the
cylinder head. 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/AK600712AC00ENG.png)
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1.Remove the snap ring from
the exhaust valve guide. 2.Using a press, remove
the valve guide toward the cylinder
block. 3.
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. The valve guide hole diameter
of the cylinder head
0.05 oversize 11.050
- 11.068 mm 0.25 oversize 11.250 -
11.268 mm 0.50 oversize 11.500 - 11.518
mm
4.Install the new snap ring
into the groove of exhaust valve guide.
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![](../../../img/11/AK400856AD00ENG.png)
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5.Press-fit the valve guide
until it protrudes 13.7 - 14.3 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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