![](../../../img/11/AK404142AA00ENG.png)
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Check the cylinder head gasket
surface for flatness by using a straightedge in the
directions
of illustration. Standard value: 0.03
mm Limit: 0.2 mm Cylinder head height (standard
value for new part): 129.9 - 130.1 mm
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![](../../../img/11/AK300593AB00ENG.png)
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1.Check the valve face for
correct contact. If incorrect, reface using valve refacer.
Valve
seat contact should be maintained uniform at the centre of
valve face. 2.If the margin is smaller than the
service limit, replace the valve. Standard
value:
Inlet: 1.3 mm Exhaust: 1.5
mm
Limit:
Inlet: 0.8
mm Exhaust: 1.0 mm
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![](../../../img/11/AK304590AB00ENG.png)
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3.Measure the valves total
length. If the measurement is less than the limit, replace
the
valve. Standard value:
Inlet:
107.58 mm Exhaust: 107.98
mm
Limit:
Inlet: 107.08
mm Exhaust: 107.48 mm
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![](../../../img/11/AK300594AB00ENG.png)
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1.Measure the free height of
spring and if it is smaller than the limit,
replace. Standard value: 53.1 mm Limit: 52.1
mm 2.Measure the squareness of the spring
and, if the limit is exceeded,
replace. Standard value: 2° or
less Limit: Max. 4°
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![](../../../img/11/AK300168AE00ENG.png)
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Measure the clearance between the
valve guide and valve stem. If the limit is exceeded,
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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![](../../../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:
1.1 - 1.5 mm
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![](../../../img/11/AK500585AB01ENG.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
correction, valve and valve seat should be lapped with a
lapping compound.
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![](../../../img/11/AK400379AC00ENG.png)
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1.Cut the valve seat to be
replaced from the inside to thin the wall thickness. Then,
remove
the valve seat.
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![](../../../img/11/AK400380AD00ENG.png)
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2.Rebore the valve seat hole
in cylinder head to the oversize valve seat
diameter. Inlet valve seat hole
diameter:
0.30 O.S.: 33.300 -
33.325 mm
Exhaust valve
seat hole diameter:
0.30 O.S.: 29.300
- 29.321 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 valve seat cutter, correct
the valve seat to the specified width and angle. See
"VALVE SEAT RECONDITIONING PROCEDURE."
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1.Force out the valve guide
toward the cylinder block using a press.
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2.Machine the valve guide
hole in the cylinder head to the size matched to the
selected
oversize valve guide. Valve guide hole
diameter:
0.05 O.S.: 11.050 -
11.068 mm
note |
Do not install a valve guide
of the same size again.
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![](../../../img/11/AK500586AB00ENG.png)
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3.Press-fit the valve guide
until it remains protruded above the cylinder head by the
amount
indicated in the illustration. Standard value:
18.3 - 18.9 mm
note |
Press the valve guide from
above the cylinder head.
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note |
The valve guides for the inlet
valves are different in length from those for
the exhaust
valves (45.2 mm for inlet valves; 48.2 mm for
exhaust valves)
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4.After installing the valve guide, insert a
new valve in it to check for smooth movement.
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