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Use the special tool Cylinder head
bolt wrench (MB991654) to loosen the cylinder head
bolts.
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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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| caution |
Do not reuse any removed stem
seal.
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| caution |
- Valve stem seal for intake valves and
for exhaust valves are different. Be
sure to install
the correct ones.
- The valve stem seal must not be
reused.
- Do not damage the tappet wall during
assembly.
- Be sure to use a special tool to install
the valve stem seal. Poor installation
causes oil loss via valve
guides.
- If oil is not applied, the valve stem
seal may rise to the surface after it is
press
fitted.
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Use a special tool to install the valve stem seal,
obeying the following procedures:
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1.The special tool valve
stem seal installer adjustable (MB992922) is composed of the
components
shown in the illustration.
1: Chuck
2: Sleeve
3:
Lock nut (small)
4: Outer pipe
5: Lock nut
(large)
6: Guide pin (5.9)
7: Guide pin (4.9)
8:
Cap
9: Guide pin (5.4)
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2.Adjust the inside chuck
diameter, obeying the following procedures.
(1)
Install the sleeve to the chuck as shown in the
illustration.
(2)
Install the shoulder of the valve stem seal to the chuck,
aligning with the outer
circumference line of the chuck as shown in the
illustration.
(3)
Turn the sleeve to wring the chuck.
(4)
Stop the sleeve at the position where you can easily remove
the valve stem seal by
hand.
(5)
Use the (small) lock nut to fix the sleeve.
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3.Adjust the stem seal
insertion length, obeying the following procedures.
(1)
The position, in which the end face of the outer pipe is
aligned with the outer circumference
line of the chuck, is 0 mm of the insertion length. Insert
the chuck and the sleeve into the
outer pipe to fit the nut as shown in the
illustration.
(2)
Turn the chuck to adjust the valve stem seal insertion
length.
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| note |
The insertion
length can change by 1 mm per the
chuck turn.
To easily know how
many times the chuck is turned, put
the mark at the position shown
in the illustration.
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(3)
Use a vernier caliper to measure the checkpoint (L1) of the
insertion length shown in
the illustration. Check the insertion
length.
Standard value: 16.0 mm
(4)
Use the (large) lock nut to fix the sleeve.
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4.Install the cap to the
guide pin.
5.Install the guide pin as shown in the
illustration.
6.Apply the engine oil to the valve
stem seal to set the chuck.
7.Install the valve
spring seat.
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8.Use the plastic hammer to
insert the valve stem seal.
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Install each valve spring with the
painted end toward the rocker arm.
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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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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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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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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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