![](../../../img/11/AK300162AD00ENG.png)
|
Using special tool Cylinder head
bolt wrench (MB991654), loosen the cylinder head bolts.
Loosen each bolt evenly, little by little, by two or three
steps.
|
![](../../../img/11/AK300163AD00ENG.png)
|
1.Set special tool Valve
spring compressor (MD998735) as illustrated to compress the
valve
spring. Remove the retainer lock. 2.Relieve the
spring tension and remove the valve, retainer, spring, etc.
Store removed
valves, springs, and other parts, tagged to indicate their
cylinder number and location for assembly.
|
![](../../../img/11/AK300164AF00ENG.png)
|
1.
caution |
The special tool must be used
to install the valve stem seal.
Improper installation could result in oil
leaking past the valve guide.
|
Install the valve spring seat. 2.Using
special tool Valve stem seal installer (MB991999), install a
new valve stem
seal.
|
![](../../../img/11/AK300717AB00ENG.png)
|
Install the valve spring with its
identification color painted end (larger pitch side)
upward (toward the valve spring
retainer). Identification:
<Intake>
Light blue <Exhaust>
Orange
|
![](../../../img/11/AK300163AD00ENG.png)
|
caution |
Do not compress the valve
spring excessively. It can damage
the stem seal.
|
1.Set special tool Valve spring compressor
(MD998735) as illustrated to compress the
valve spring. Install the retainer
locks. 2.Relieve the spring tension. Check that
the retainer locks are seated correctly.
|
![](../../../img/11/AK300591AB00ENG.png)
|
1.When the removed cylinder
head bolts are to be reused, check that the shank length of
each bolt meets the limit. If it exceeds the limit, replace
the bolts. Limit: 99.4 mm 2.Apply
engine oil to the thread of the bolts and to the
washers.
|
![](../../../img/11/AK300165AD00ENG.png)
![](../../../img/11/AK304589AB00ENG.png)
|
3.Using special tool
Cylinder head bolt wrench (MB991654) tighten the bolts to
the specified
torque, using the tightening sequence
shown. Tightening torque: 78 ± 2
N·m 4.Loosen all bolts fully in the
reverse order of tightening. 5.Retighten the
loosened bolts to in the tightening sequence
shown. Tightening torque: 20 ± 2
N·m
|
![](../../../img/11/AK300166AD00ENG.png)
|
6.Make a paint mark across
each bolt head and cylinder head. 7.Tighten the
cylinder head bolts 90 degrees in the specified
order. 8.
caution |
- If the bolt is turned
less than 90 degrees, proper fastening
performance may not be achieved. Be
careful to turn each
bolt exactly 90 degrees.
- If the bolt is overtightened, loosen the
bolt completely and then retighten it by
repeating the tightening procedure from
step 1.
|
Tighten the bolts another 90 degrees in the same
order as in step 7, and check that the
paint marks on the cylinder head bolt are aligned with the
paint marks on the cylinder head.
|