![](../../../img/11/AK202723AE00ENG.png)
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Use the special tool Cylinder head
bolt wrench (MB991654) to loosen the cylinder head
bolts.
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![](../../../img/11/AK300383AD00ENG.png)
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Compress the valve spring using the
special tool Valve spring compressor (MD998735) and Retainer
holder C (MB992089), then remove the retainer
lock.
note |
Store removed valves, springs
and other parts, after putting to each of them a
tag that identifies its cylinder No. or
installation location.
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![](../../../img/11/AK300589AA00ENG.png)
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caution |
Do not reuse any removed stem
seal.
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![](../../../img/11/AK300164AF00ENG.png)
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1.Install the valve spring
seat.
caution |
- Do not reuse any removed valve stem
seal.
- The special tool must always be used
when installing the valve stem seal.
Improper installation could result in
oil leaks past the valve guide.
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2.Use the special tool Valve stem seal
installer (MD991999) to install a new stem seal on the valve
guide.
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![](../../../img/11/AK202551AB00ENG.png)
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Install each valve spring with the
painted end toward the rocker arm.
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![](../../../img/11/AK300383AD00ENG.png)
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Compress the valve spring using the
special tool Valve spring compressor (MD998735) and Retainer
holder C (MB992089), then install the retainer
lock.
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![](../../../img/11/AK202750AB00ENG.png)
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1.When reusing a cylinder
head bolt, check that its nominal length (shank length) is
not greater than the limit. If the limit is exceeded,
replace the bolt. Limit: 99.4
mm 2.Apply engine oil to the threads and
washer of the bolt.
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![](../../../img/11/AK306004AC00ENG.png)
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3.Use the special tool
Cylinder head bolt wrench(MB991654) to tighten the bolts to
the specified torque in the indicated
sequence. Tightening torque: 78 ± 2
N·m 4.Loosen all the bolts
completely. 5.Tighten the bolts again to a torque
of 20 ± 2 N·m in the indicated
sequence. 6.Make paint marks on each bolt’s
head and on the cylinder head.
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![](../../../img/11/AK202720AB00ENG.png)
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7.Turn the bolts 90°
in the tightening direction and in the indicated
sequence. 8.Give another 90° turn in the
tightening direction to each bolt, making sure that the
paint mark on the bolt head and that on the cylinder head
are on the same line.
caution |
- When the tightening angle is smaller
than the specified tightening angle, the
appropriate tightening capacity cannot
be secured.
- When the tightening angle is larger than
the specified tightening angle, remove
the bolt to start from the beginning
again according to the
procedure.
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