![](../../../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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1.
caution |
Do not allow any foreign
materials get into the coolant passages, oil
passages and cylinder.
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Degrease the cylinder head gasket mounting
surface.
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![](../../../img/11/AC107217AI00ENG.png)
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2.Assemble to the cylinder
block so the cylinder head gasket identification mark
"64-278"
is at the top surface and on the inlet side.
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1.Insert the O-ring to the
water pipe, and coat the outer portion of the O-ring with
water or engine coolant.
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2.Insert the water pipe to
the water by-pass fitting of the cylinder head assembly,
and install the cylinder head assembly to the cylinder
block.
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![](../../../img/11/AC102537AB00ENG.png)
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1.Check that the nominal
length of each cylinder head bolt meets the limit. If it
exceeds
the limit, replace the bolt with a new
one. Limit (A): 99.4 mm 2.Apply a
small amount of engine oil to the thread of the bolts and to
the washers.
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![](../../../img/11/ACE02174AC00ENG.png)
![](../../../img/11/AC102331AB00ENG.png)
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3.Use special tool cylinder
head bolt wrench (MB991654) to tighten the cylinder head
bolts
as follows: (1)
Tighten the cylinder head bolts to 78 ± 2 N·m in
the order shown. (2)
Loosen the bolts fully in the reverse order of that
shown. (3)
Tighten the cylinder head bolts to 20 ± 2 N·m in
the order shown. (4)
Apply a paint mark to the heads of the cylinder head bolts
and cylinder head, then tighten
90 degree angle as shown. (5)
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caution |
The bolt is not
tightened sufficiently if the bolt
is
tightened less than 90 degree
angle.
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Tighten the bolt an additional 90 degree angle as
shown. Then check to see that the paint
mark on the head of the cylinder head bolts and the paint
mark on the cylinder head are aligned. (6)
If tightening the bolt 90 degree angle results in moving the
paint mark on the bolt
past the paint mark on the cylinder head, remove the bolt
and start over from step 1.
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